Media reviews and comments.

MonoPulse speakers, introduced fifteen years ago, have had about forty media reviews up to 2018.

This is In addition to a huge number of customer comments.

Running through all these is the praise for, and often surprise at, the sheer realism and accuracy of sound-stage they convey.

 

The most recent was a posting this year in the Norwegian forum hifisentralen.no

Everybody knows the feeling of wanting to upgrade, but I have now taken "3 steps back" from something MUCH more expensive.  I cannot remember being able to relax as much and enjoy the music as I do now - with a system that barely cost me the list price of the cables I used.  This is the music pleasure I've been looking for. That Monopulse could deliver at its price is ridiculous indeed.(translated and shortened with approval):

This was followed by an e-mail directly to me:

Allan: I have rediscovered some of the childlike joy of listening to music. Much thanks to your MonoPulse. Its remarkable how the joy can appear out what seems like nowhere when the synergy of a system is right, regardless of price tag. Thank you for making great speakers available at a cost normal people can afford.

Foremost Norwegian reviewer Roger Rognlien published a twelve page review in worldpress.com

Like a million for just a dime - I compare this reasonably priced speaker with anything money can buy - they deliver deep and mighty, with beautiful vocals - not something you normally find at this price bracket, if at all - a product to die for.

Four highlight summaries - see below for fuller versions of all 37

Hi-Fi Choice

The Model A speaker at its second 'Best Buy' award from the prestigious Hi-Fi Choice.

Remarkably impressive coherence, accurately and convincingly defining the position of a performer in space.
What Hi-Fi

The MonoPulse Model S loudspeaker was given the top five star rating by What Hi-Fi.

Extraordinary powers of timing and resolution ... almost ridiculously good. Music is delivered with a precision that makes other loudspeakers sound blurred and hazy by comparison. The presence is enough to warrant five stars on its own. Five stars

Hi-Fi +The MonoPulse Model A received a fantastic review in Issue 42 of Hi-Fi +.

Sheer vividness of their music making … the shock of reality …the sheer speed and integrity. Plenty of deep bass extension.
A genuine audiophile product at a very realistic price.

Hi-Fi news

Keith Howard, consultant Technical Editor for the prestigious Hi-Fi News, about the Model S.

Its fundamental honesty of sound is its key attribute and opens a window on a musical performance in a way that slugged-sounding speakers - of which there are still too many - never can. This is what real high fidelity is all about.

 

Below - fuller summaries of 37 other reviews.

Hi Fi+ August 2013. By Paul Messenger

Hi-Fi +“EQUIPMENT REVIEW: The MonoPulse Model S."

MonoPulse is one of Britain's smaller speaker makers, but has a very distinctive range of speakers, and enjoys a steady demand (especially from Scandinavia), and seems perfectly happy to remain a small operation.
In a business dominated by wood-veneered boxes, it's a pleasant change to find a cloth-covered speaker in a selection of colours.
Another distinctive (and welcome) touch is a carrying handle, usefully integrated into the back panel and facilitating moving the speakers around for best imaging and bass evenness. Neater still in my view is the floor-coupling arrangement, using chunky outriggers. These are retracted for packing and transit, but each may then be pulled out to expand the footprint. Thumbwheel-equipped spikes are then attached at the ends, keeping the enclosure's port (that fires downwards through the base) clear of the floor. Said port is tuned to a claimed 39Hz,

The key technical feature here lies in offsetting the drivers with respect to each other and the listening zone.  The two drivers are electrically linked via what's described as a 'patented asymmetric' crossover network, the objective being to maintain accurate impulse synchronicity and precise musical leading edges through the crossover region. The driver line-up consists of a 160mm (nominal frame diameter) bass/mid unit with a polypropylene cone, plus a 28mm fabric dome tweeter that operates above 3.5kHz and is fed via a fourth-order (24dB /octave) crossover network. The manufacturer's specified 87dB sensitivity is confirmed in our tests, which is a good figure in view of the speaker's fine bass extension to 25Hz (-6dB) in-room).

The manufacturer claims that this design delivers superior leading-edge definition, and I can't disagree with the assertion that the Model S has fine overall coherence, and in this respect is somewhat reminiscent of that achieved by loudspeakers using single full-range drivers. Stereo imaging is precise right across the soundstage, and even shows reasonable depth perspectives despite the forward tonal balance.
One obvious if perhaps somewhat surprising strength lies in the bass region, which is also impressively smooth, even and deep. This ensures that the speaker provides a firm underpinning to bass-rich material without any of the boomy exaggeration that is regrettably all too common, especially amongst modest port-loaded designs.

This is certainly not a speaker that's been designed either by committee or computer programme, and that alone must be a good thing. The presence forwardness ensures plenty of explicit detail when playing at low late-at-night levels.  Add in the fine overall coherence, precise imaging and the even and extended bass and it all adds up to a very neat overall package.

HI-FI WORLD - May 2013. Timeline - MonoPulse refreshes its top-of-the-range, Model A loudspeaker.

"a wide stereo image and an almost holographic feel from the right recordings."

On the face of it you wouldn't think there was much connection between loudspeakers and phased-array radar systems. Well, think again - or just have a chat with Allan Hendry. For it was Allan's work on radar equipment in the aerospace industry that started him thinking about loudspeaker design and how it could be improved.   It took him 10 years but he finally came up with his solution - and the MonoPulse brand was born, and has become an established brand.

The design rests on in the importance of correct phase relationship between the drive units in a loudspeaker. ln the MonoPulses this is optimised through the precise positioning of the mid/bass and tweeter drivers and their integration through the crossover network to achieve genuine wave-front time-alignment through the entire audible frequency range.

The MonoPulses major on three attributes - timing, detail and stereo imaging.  Voices are especially well presented with a wide stereo image and an almost holographic feel from the right recordings. Barb Jungr's vocals on 'The Men I Love' floated serenely into the room with her distinct intonation and style portrayed admirably.  lt's a style the speakers seem to particularly thrive on as Sinead O'Connor sounded similarly impressive. Transients are fast and clean - the MonoPulses giving the leading edge of notes a real zing. Bass goes commendably low with the port adding extra reinforcement to the eight-inch mid/bass unit. Charles Mingus walking bass lines came across well and the MonoPulses never sound stressed or as though they were reaching the extremes of their ability.

Mono & Stereo - Oct 2010. England holds quite a few unique audio jewels.

"Listening to MonoPulse S speakers leaves you in special harmonious mood."

MonoPulse S speakers. England holds quite a few unique audio jewels that are many times hidden from us. There are quite a few amplifiers, speakers, cables and other accessories that are less known to the majority of audiophiles and music lovers. I wouldn't say that MonoPulse is not recognized. They have already got some accolades in the UK audio press, but I'm not sure they're known to the many of audio lovers worldwide.

Contemporary Art Deco?
Elegant use of materials and construction hides the real value of materials used and gives the S a kind of classic-timeless appearance. I always check aesthetics of new gear with my wife for a second opinion. She gave an instant nod to the elegance and freshness of the S speakers.

Class A friendly I will leave the specs to speak for themselves, but let me note just the 87dB efficiency. Minimal recommended power for tubes amp is 18 watts and for solid state around 35 watts. This puts them into very interesting position. 18 watts might not get you pure triode class A, but 35 watts of transistor power will open up the world of pure class A. Lately quite few of legendary companies are bringing back this topology and MonoPulse have a great advantage here.

The S speakers disappeared unlike many I have heard over the years. I’m not sure what is the exact reason or technical solution behind it, but they manage to fill out the room around them without giving out their exact position. Salute! This works great for stereo and I vividly daydreamed about surround setup with MonoPulse S speakers. This would make any videophile more than happy and fans of SACD recordings (for example 2L recordings) would jointly embrace them without much consideration.

Conclusion Alongside remarkable disappearance of speakers, MonoPulse strikes you with rhythm and pace of the music that is rarely found in this price range At a few moments I would swear that its micro dynamics are coming from a horn based speaker. These two aspects alone are more than worth considering when you're in the need of new speakers. These are not full flagged large dynamic speakers like my listening reference Acoustic Preference Maestozo 2. MonoPulse never even try to be more then what they are. They succeed to marry the two above mentioned characteristic in such a way that it's both instantly captivating and hard to forget. Listening to MonoPulse S speakers leaves you in special harmonious mood, like long decayed notes from masterfully played piano maestro does. Don't bypass these speakers.

HI-FI CHOICE - July 2010. MonoPulse breaks the rules on stereotypes.

Fine 'sweet spot' focus and coherence, with good definition

Hi-Fi ChoiceThe basis of MonoPulse loudspeakers, lies in applying audio lessons that were learned worked with phased-array radar systems, the prime purpose being to reproduce transient leading edges accurately. This imposes some constraints on the driver layout. These are solved by placing the inset tweeter beneath the mid/base drive unit. This goes some way to explaining the decision to go for a fabric covering over the front and sides of the enclosure. One worthwhile consequence is that the speakers are, therefore, available in a wide range of different colours, perhaps chosen to match carpeting or curtains.
Despite its very slim appearance from the front, the Model S still has room for a 160 millimetre bass/mid driver with a visible (through the fabric) come diameter of 110mm. The tweeter has a relatively large soft-dome diaphragm. The enclosure is reflex-loaded by a downward-firing port in the base, metal fet keeping the port clear of the floor, with or without the use of thumbwheel-tightened spikes. Electrical connection is via twin terminal pairs.

Sound quality.
Sitting in the prime listening position, I was very impressed by the sound quality of the Model S. The MonoPulse is deliberately designed as a 'sweet spot' loudspeaker, and will, therefore, show expression and time coherence in a relatively small listening zone. Imaging is impressively spacious, with excellent focus and coherence. Different in nearly every respect from the stereotypes, the MonoPulse Model S has unusual styling and presentation and its sonic performance orientated towards a sweet spot listener. It certainly represents an interesting alternative.

HI-FI WORLD - May 2010. One Shout - A major upgrade of the Model S.

"MonoPulse's Model S has had a major upgrade."

Hi-Fi WorldIt has now been optimised for use with valve amplifiers, particularly using vinyl sources. The 8 ohm minimum impedance, touched five times across the frequency spectrum, gives an easy and balanced drive, while the 30kHz top end response is perfect for the wide bandwidth of modern vinyl. The 300 watt maximum power handling means they also show grace under pressure.

Hi-Fi News - April 2010. Restored Pulse.

Major upgrade to MonoPulse Model S.

MonoPulse's Model S has witnessed some key upgrades. The top-end frequency response now extends to 30kHz while the load impedance in made easier, touching a minimum of 8 ohms across the entire bandwidth. This is all in aid of furthering the speaker's compatibility with lower-powered valve amplifiers.

On the other hand, the Model S now enjoys a higher 300 watt maximum power handling, ensuring it's just as suitable for use with substantial solid state amps. Cake all round.

WHAT HI-FI - Awards 2009. Best of both worlds?

Five stars

Model A wins top, five star, award. "fabulously, uniquely brilliant."

What Hi-FiMONOPULSE IS serious about its timing. The company's idea is to get the leading edges of all notes, from the entire frequency range, to the listener at the same time. It's what single-driver speakers are famed for, but MonoPulse uses two precisely placed drivers in conjunction with a specially designed crossover to create a 'single impulse wave front'. The result should be a rhythmically seamless presentation. It is.

Astonishing precision results in excitement by the bucket-load. Play the scuzz-rock/disco-pop mix of Marmaduke Duke's Everybody Dance and the As astonishing precision results in attacking excitement by the bucket-load. Every note begins with pinpoint precision, but there's no sacrifice in texture or natural note degradation - these aren't clinical to the extent of sterility.

A joyful presentation. The As are chunky and full-bodied with sensational bass punch, depth and definition. Vocals are equally impressive - full of life and nuance. The overall presentation has excellent width and three-dimensionality. Dynamics, both small-scale and large, are a joy, and although the rhythmic integration of instruments is seamless, it doesn't prevent separation in the soundstage, allowing you to identify individual strands with ease.

The As combine the best of a single-driver with the best of a more traditional multi-driver array. But care is required with positioning. MonoPulse recommends that 85cm between each speaker and a wall. We'd add that toeing them out a little more than usual helps them sound their best.

If you can overlook the odd manufacturing flaw, the MonoPulses are fabulously, uniquely brilliant.

WHAT HI-FI - July 2009. Model A grips and controls information like the Stasi.

Precise speakers with a wide range of talents, timing being the most immediately impressive.

What Hi-FiTHE MonoPulse As' specification (28mm soft-dome tweeter decoupled from the rest of the cabinet, offset mid/bass driver on the front panel, in a quest for class-leading time alignment) looks exiting.

Marmaduke Duke's Heartburn is a rapid, clattering test of timing and detail resolution, but it's meat and drink to the MonoPulses. The soundstage the As present is open, expansive and utterly coherent, and they present the song in fast, fluent and rhythmically adept measures. They're unflustered by dynamic shifts and, thanks to a midrange that's fluid and expressive, grant singers all the anima they require. Low frequencies may not have the out-and-out extension of some, but they're punchy, controlled and tonally articulate.

Superb sound The real party piece, though, is the way the As enter individual notes and sounds - these speakers grip and control information like the Stasi, and have the precision to make a tune as unruly as Four Tet's Wing Body Wing sound organised and cohesive. As a listen they're endlessly satisfying.

WHAT HI-FI - Ultimate Guide March 2009. MonoPulse Model S, five star holder.

Five stars

What Hi-FiMonoPulse is a company dedicated to an idea. While some speaker manufacturers concentrate on creating a certain kind of frequency response, MonoPulse concentrates on timing. What is timing? Well, if one driver is moving forward and the other moving backward at exactly the same instant, the ‘leading edge’ information of each sound – some in the frequency range of one driver, some in the range of the other – will hit your ears at different times.

If you can only do one thing... MonoPulse says it has designed a speaker in which the drivers move in absolute unison. And it’s worked. In terms of timing alone, the Model Ss are almost ridiculously good. Music is delivered with sublime rhythmic precision, a shapely sense of phrase and beat that makes other loudspeakers sound blurred and hazy by comparison.

From the jangly ‘60s inflections of The Shins’ Wincing the Night Away to the testosterone-fueled bombast of Nick Cave’s side-project Grinderman, the S’s vibrancy, accuracy and rhythmic presence is extraordinary enough to warrant five stars on its own. So the Monopulse Ss are not a typical, jack-of-all-trades all-rounder. If you were feeling cynical, you could say they simply do one thing well – but in the sense that Jimi Hendrix did one thing well. They do that one thing so staggeringly well that you could spend years enjoying that one talent. In short, these are great speakers.

Verdict. If you didn't know how critical timing is to a speaker's performance, the Ss will show you."

WHAT HI-FI - December 2008. Pulsating Floorstanders really do rock our world.

Five stars

Model A wins top, five star, award. "Add class-leading sound staging to the plus points"

What Hi-FiWHAT MAKES THE Model As special? Well, the MonoPulse name gives a clue. The company's big thing is about responding to the leading edge of notes as accurately as possible. To this end these floorstanders use an unusual configuration of crossover and have offset drive units to aid time alignment - the 28mm soft-dome tweeter is on top of the cabinet, the 20cm mid/bass sits conventionally on the front panel. The idea is that both drivers move together at every transient, giving a more precise, coherent sound wave.

When it comes to timing, detail resolution and stereo imaging, the As have little to fear from any rival. These MonoPulses are immensely musical speakers that latch onto a rhythm track with breathtaking confidence.

Verdict. Odd appearance apart there's an awful lot to like about these MonoPulses. Make sure you give them an audition."

HI-FI CHOICE - December 2008. MonoPulse Model S speakers revised.

Stereo images are well formed and focused

Hi-Fi ChoiceAllan Hendry's MonoPulse loudspeaker designs were developed by applying lessons he learned when working on phased array radar systems. MonoPulses come in two distinct ranges, the larger A Models, and the more compact S Models. We originally reviewed this pair of Model Ss in issue 304, with somewhat mixed results, but it has returned updated.

Despite its very slim appearance from the front, the S still has room for a 160mm bass/mid driver with a large diameter voice coil. The main tweeter has a relatively large 31mm soft dome diaphragm. Tthe 62S has the fine crossover zone coherence that makes the larger models in the MonoPulse range such an interesting proposition. Smooth and lucid. Reflecting the fine coherence, stereo images are well formed and focused. The modifications have significantly improved the S.

HI-FI WORLD - October 2008. Pulse Rate - A review of the Model A.

"a fabulously integrated big and relaxed sound."

Hi-Fi World

Allan Hendry of MonoPulse is hi-fi enthusiast since his early days, Allan worked in the aerospace industry, and it was this work that made him think about loudspeaker design and in particular the necessity of phase coherence from the drive units. Allan investigated the impulse response of a wide range of loudspeakers and came to the conclusion that it was vital to time-align the treble and bass drivers in order that an impulse sent to both drivers would arrive simultaneously at a measurement microphone set in front of each unit (and therefore, at the listeners ears). Also that the connection of tweeters out of phase to compensate for the phase inversion of a second order crossover network causes more problems that it solves. Finally, that maintaining phase coherence in a loudspeaker becomes more difficult the more drive units you add.

With this in mind, he picked up pen and paper and the result is the MonoPulse range of loudspeakers, with the name being a nod towards the impulse-correct designs he intended to create. There are two models on offer (plus matching centre channel and rear surround items) - the Model S series and the 'Audiophile' Model A which uses an 8" (200mm) main driver with a Kevlar cone and a four layer voice coil, together with a 28mm tweeter claimed to extend to 30kHz.

The A's design crosses over to the tweeter at 4kHz. In keeping with the time domain accuracy, the crossover uses a second order filter on the bass driver, but a fourth order design on the tweeter. The tweeter is suspended separately at the top, isolated it from the main driver and cabinet, and set back by the time alignment.

The cabinet itself is covered with cloth which is available in ten different colours, including Black, two different Blues, Red ,Green and Burgundy. The steel hoop can also be specified in Gunmetal, Black, Sand, Bronze or Burgundy. Build quality is very good and I personally like the styling. .

SOUND QUALITY
A decently sized main drive unit usually means a decently large soundscape and this is indeed the case with the MonoPulse Model As. Their eight inch bass/mid unit endows them with a lovely, properly grown up sound that gives the bass and midrange a great sense of depth, ease, warmth and detail. That is not to say that the As are all soft, warm and fluffy at the low end as they certainly are not - bass lines were deep, confident, pacy and blessed with fine rhythmicality. However, whereas some designs with smaller drive units can give a similar effect with an underlying sense of 'see how hard I'm working to give you all this!' the As never seemed under duress.

Another most notable feature of the Model A's performance was their transient response. Allan's work on the phase coherence of the design has resulted in a loudspeaker with no hesitancy or wallow. Big-sounding unstressed loudspeakers can often be rather flabby in timing terms but not so the As; drum strikes are swift and snappy, bass guitars are detailed and well defined, and every instrument stands out from its cohorts. Although the image generated by the MonoPulse does not quite envelope the listening area from side to side in a way that some designs can, they still have a fine sense of spaciousness between them, and order everything very neatly in this space. Additionally, they do give fine front to back depth to the proceedings.

Mating a larger unit to a single tweeter can often be a hit or miss affair but MonoPulse has done well here. There is no sense of disjointedness between the two drivers and the As have a well defined and crisply spry top end.

CONCLUSION
In a world of loudspeakers populated by the equivalents of high-revving four cylinder engines, the MonoPulse As are a relaxed and smooth V8. They have a fabulously well integrated and big, relaxed sound that is also well defined, yet one that times with positively metronomoic precision. These are rare qualities to find together in one loudspeaker and, as a result, the As are something of a breath of fresh air into the loudspeaker market. combine this with their easy load and wide range of intereor-friendly finishes and they make a very strong case for themselves. Well worth checking out.

HI-FI CHOICE - August 2008. MonoPulse Model A speakers offered as prize.

Hi-Fi Choice

Monopulse hand-builds all its loudspeakers, to ensure the product is bespoke as possible. But it's not just about hand-built cabinets and fancy finishes; MonoPulse supremo Allan Hendry worked with pulsed phased-array radar systems before retiring and concentrating on his first love, loudspeaker design.

All of which means the MonoPulse designs are packed full of innovative, clever technology, the kind that wins Ultimate Group Tests in fact.When we reviewed the A in HFC 302 we gave it a richly deserved deserved Best Buy thanks to its fine performance, coupled with excellent dynamic headroom. And, as you might expect from such a phase-corrected loudspeaker, the temporal coherence was superb.

Hi-Fi News - July 2008. Colourful Bargain.

Stylish MonoPulse improved.

Hi-Fi News"Striking British loudspeakers from MonoPulse are now improved as power handling rises. The flagship Model A, has its maximum power increased to 550W.

HI-FI WORLD - July 2008

PULSE ON THE WIRE.

Hi-Fi WorldNews comes to us of MonoPulse's revised Model A loudspeaker, a striking looking design that has just been improved. Power handling is upped to 300W RMS, whilst the cabinet is revised - with a more angled appearance. What is retained are the ferro-fluid cooled HF units separately mounted.

HI-FI CHOICE - March 2008. Elegant MonoPulse Model S..

Compact speaker owes much to its larger siblings

Hi-Fi ChoiceDespite (or because) it has dared to be different, new kid on the block MonoPulse, has succeeded both in presentation and engineering. The application of phased array radar principles to loudspeaker design might seem unusual, but it has been the core foundation of the company's approach. No doubt, due to the fact that this was the field in which principal Allan Hendry spent much of his working life. Applying this to loudspeaker design imposes significant constraints on driver distribution, which in turn is probably responsible for the the decision to go for a fabric-covered presentation,, which also allows for a wide choice of ten different colours.

MonoPulses come in two distinct forms, the much admired larger Model A and the more compact Model S. Despite a width of only 170mm, MonoPulse has managed to squeeze a 160mm mid/bass driver with large diameter voice coil into the floorstanding enclosure.Model S. In the interest of time alignment, the main is mounted above the tweeter and is reflex loaded by a downward-firing port in the base. Metal spikes keep the port clear of the floor, with or without the use of thumbwheel-tightened spikes. Electrical connection is made via twin terminal pairs. The main tweeter has a relatively large 28mm silk dome diaphragm.

Room measurements indicate - and listening tests confirm - that it delivers a fine performance through the bass and broad midrange.

LAB REPORT. Happily the bass extends usefully down to 30Hz or so, with the port tuned to 45Hz, and the amplifier load looks relatively easy to drive.

VERDICT. This exceptionally elegant floorstander uses a waveguide to reduce the crossover frequency and improve voice integrity. The result is lively, with a sweet top end and fine coherence when carefully sited.

HI-FI CHOICE - January 2008. Best Buy. MonoPulse Model A.

Unconventional loudspeaker design is the name of the game

Hi-Fi ChoiceIt's less than five years since we first encountered MonoPulse, as a relatively new brand with a number of interesting and unconventional ideas about loudspeaker design. Patron and hi-fi enthusiast Allan Hendry, worked for many years on pulsed, phased array radar and, after his retirement, applied his appreciation of the importance of phase relationships to loudspeaker design. These applied especially to the relative positioning of the drive units and their integration through the crossover network, in order to achieve genuine wavefront time-alignment through the entire region.

As part of the time alignment, the two drivers are mounted on separate baffles, so the bass/mid driver fixing is slightly nearer listeners than the Morel sourced 28mm soft domed tweeter. This also provides mechanical and acoustic isolation between the drivers.

SOUND QUALTY. Remarkably impressive coherence, especially through the voice band, which seems to be MonoPulse's particular stock in trade. This in turn helps to sharpen the image focus and precision, more accurately and convincingly defining the position of a performer in space. That's by no means the A's only strength. The large main driver helps deliver fine performance through the bass and mid band, with good overall balance and ultimate bass extension.

Best of all is dynamic expression, which is comfortably ahead of the pack and further enhanced by the superior timing and across-the-band time coherence.

LAB REPORT. Sensitivity is a pretty generous 90dB.

VERDICT. Splendid dynamic expression and wonderful time and coherence. Fine bass to mid balance and dynamics. Remarkably impressive coherence through the voice band.

(In this group test the MonoPulse Model A, with an 88% score, was well ahead of the 80% scored by the more expensive Dali Mentor 5.)

WHAT HI-FI - Ultimate Guide 2007. MonoPulse Model S, five star holder.

Five stars

What Hi-FiMonoPulse is a company dedicated to an idea. While some speaker manufacturers concentrate on creating a certain kind of frequency response, MonoPulse concentrates on timing. What is timing? Well, if one driver is moving forward and the other moving backward at exactly the same instant, the ‘leading edge’ information of each sound – some in the frequency range of one driver, some in the range of the other – will hit your ears at different times.

If you can only do one thing... MonoPulse says it has designed a speaker in which the drivers move in absolute unison. And it’s worked. In terms of timing alone, the Model Ss are almost ridiculously good. Music is delivered with sublime rhythmic precision, a shapely sense of phrase and beat that makes other loudspeakers sound blurred and hazy by comparison. The S’s vibrancy, accuracy and rhythmic presence is extraordinary enough to warrant five stars on its own.

So the Monopulse Ss are not a typical, jack-of-all-trades all-rounder. If you were feeling cynical, you could say they simply do one thing well – but in the sense that Jimi Hendrix did one thing well. They do that one thing so staggeringly well that you could spend years enjoying that one talent.

Verdict. If you didn't know how critical timing is to a speaker's performance, the 32Ss will show you.

Hi-Fi News - August 2007. Slim City. MonoPulse Model S.

If you're looking for a speaker to take you direct to the core of the music, few rival this revamped MonoPulse at the price.

Hi-Fi NewsThe Model S uses a 160mm Audax Kevlar-coned bass-mid driver (which has adhesive pressed between the back of the pressed steel chassis and magnet assembly to enhance the unit's ruggedness and possibly suppress structural resonances); and an aluminium voice coil, strontium magnet, silk dome tweeter; which is claimed to extend the response out to 30kHz.

In order to achieve time alignment of the drivers along a slightly uptilted listening axis (to suit typical seated ear height), the bass/mid driver is located above the tweeter - an arrangement we don't see so often today but was once popular, for example, with Mission.

What earns it a place in my my affections is its essential lucidity and vitality.

HI-FI CHOICE - August 2007. MonoPulse Model S

MonoPulse's new baby features its unusual crossover and styling

Hi-Fi ChoiceRelatively young as hi-fi companies go, MonoPulse was founded by one Allan Hendry who spent much of life in electronics working on pulsed, phased array radar systems, and then decided to to apply the knowledge he'd gained to his lifelong passion for hi-fi and loudspeakers. The relevance of radar to loudspeaker design may not be immediately apparent, but Allan is particularly conscious of the need to maintain the correct phase relationships between the bass/mid driver and the tweeter through the crossover region, in order to reproduce the leading edge of an impulse accurately, and that's reflected in both the crossover network design and in the unusual way the drivers are positioned and spaced.

The MonoPulse stereo models come as the Model S and the Model A. Both eschew the usual real or imitation wood finish, and are clad all over in cloth, with ten different colour options available, from the sober to the mildly outrageous. Crtainly unusual, but rather attractive.The Model S has a 160mm frame, Kevlar-cone main driver. The tweeter is a 28mm soft dome device, mounted quite low down, below the bass/mid driver. A reflex port into the base of this enclosure, and held an appropriate distance off the floor by little feet with spikes. The small main driver enables the enclosure to be very slim. Connection is made via twin terminal pairs.

MonoPulse places its main emphasis on maintaining integrity and phase coherence through the crossover region, and it's true that the Model S is largely successful in this respect. Voices - both speech and singing - sound impressively vivid, coherent and expressive, highlighting the accents and tonalities of different individuals in a most persuasive way.

WHAT HI-FI - May 2007, giving the Model S their top, five star, award.

Quicken Your Musical Pulse.

What Hi-FiMonoPulse is a company dedicated to an idea. While some speaker manufacturers concentrate on creating a certain kind of frequency response, MonoPulse concentrates on timing. What is timing? Well, if one driver is moving forward and the other moving backward at exactly the same instant, the ‘leading edge’ information of each sound – some in the frequency range of one driver, some in the range of the other – will hit your ears at different times.

MonoPulse says it has designed a speaker in which all the drivers move in absolute unison. And it’s worked. In terms of timing alone, the Model Ss are almost ridiculously good. Music is delivered with sublime rhythmic precision, a shapely sense of phrase and beat that makes other loudspeakers sound blurred and hazy by comparison.

The 32S’s vibrancy, accuracy and rhythmic presence is extraordinary enough to warrant five stars on its own. You could say they simply do one thing well – but in the sense that Jimi Hendrix did one thing well. They do that one thing so staggeringly well that you could spend years enjoying that one talent."

If timing is your main musical concern, you simply have to check these out.

Verdict. Extraordinary powers of timing and resolution; available in more than ten colour combinations. If you didn't know how critical timing is to a speaker's performance, the Ss let you know explicitly. Five stars

HI-FI CHOICE - July 2006. MonoPulse Model A awarded Best Buy.

MONOPULSE MODEL A

Hi-Fi ChoiceThe man behind MonoPulse, hi-fi enthusiast Allan Hendry, spent much of his working life on pulsed phased-array radar systems. This has made him particularly aware of the importance of phase relationships. He’s applied that understanding to his loudspeakers, using the geometry of the enclosure as well as the design of the crossover network to maximise the phase coherence through the crossover zone.

The Model A has a generous bass/mid driver which features a large diameter voice coil that confers exceptionally high power handling. The bass enclosure is heftily constructed in MDF and covered in a wide choice of coloured fabrics. A reflex port fitted into the base is held several centimetres off the floor by some very well founded and purposeful spikes, and the whole thing feels very solid and stable. The two drivers are mounted on separate baffles, so the bass/mid driver sits slightly nearer listeners than the 28mm soft dome tweeter. Connection is made via twin terminal pairs, allowing for bi-wiring or bi-amping.

SOUND QUALITY. The first thing one notices when placing and connecting up the Model A is just how coherent and ‘real’ it sounds. It might not match the strict tonal accuracy and neutrality of some of its immediate competitors, but no time-smear, combined with a vigorous dynamic delivery, provides more than ample compensation. MonoPulse uses the phrase ‘transient synchronism’ to describe its particular strength, and that’s as good as any to describe the crispness and clarity with which individual instruments are defined. Timing is truly exceptional, and percussion in particular is notably well defined, making even drum solos unusually entertaining and musical!

Hi-Fi News - February 2006. By Keith Howard.

Current Affairs.

Hi-Fi News"In 20 years nobody has tried to verify if speakers draw unexpectedly large currents on music signals."

The MonoPulse is even better behaved, with no excess current episodes recorded on either music tracks."

hi>fi+ - December 2005. By Paul Messenger

Hi-Fi +EQUIPMENT REVIEW: The MonoPulse Model A Loudspeaker.

The man behind the brand is Allan Hendry, a hi-fi enthusiast of long-standing, but one who has spent much of his working life as an engineer working in the field of pulsed, phased-array radar systems. That background, in which phase relationships and coherence are a prime ingredient, provided the inspiration to experiment with loudspeakers, and to try and achieve a design which placed the maintenance of phase linearity high up the list of priorities, including the problematic crossover transition. The ultimate consequence was the decision to manufacture the range of MonoPulse loudspeakers for commercial sale.

The range today basically consists of two models, code named Model S and Model A, both based around a common engineering theme but growing progressively larger. The 20 litre Model S was the first to come to my attention, some two and a half years ago, and about six months back I tried the larger 40 litre Model A for the first time. Both impressed me a great deal with the sheer vividness of their music making – “the shock of reality” was how I described that original Model S.

The whole thing sits on little steel feet that accommodate 8mm spikes and keep the ported base clear of the floor. Although it’s quite tall and not particularly deep, the whole thing feels reassuring stable. In engineering terms this is a large, 40 litre two-way, port-loaded through its base. It has a 200mm bass/mid driver – significantly larger than today’s norm. This uses a moulded frame and doped paper cone, and is positioned vertically very close to the 28mm fabric dome tweeter. The latter is mounted on its own sub–baffle, set back by a small but precise amount, in order to establish the precise phase integrity.

The spec claims a generous sensitivity of 90dB, alongside an easy (minimum 7 ohms) amplifier load. Both these claims were confirmed on test, indication that this speaker should make a find partner for low power valve amps. The port is tuned to 37Hz, which should ensure good ultimate bass extension.

A remarkable immediacy of a performance that clearly has minimal time-smear and fine transient integrity. MonoPulse calls this aspect of the performance ‘transient synchronism’, which is as good a buzz-phrase as any for something that really does bring a crispness and a very welcome dose of realism to the proceedings. Furthermore, by preserving good leading edge integrity, dynamics somehow seem to sound punchier and more believable. In some respects I am reminded of the very special immediacy that one finds with speakers using single full range drivers, and if the A doesn’t go quite that far in terms of absolute coherence, it doesn’t sacrifice performance at the frequency extremes in the way that single-driver systems invariably do.

If superb transient integrity is its main claim to fame, there’s very little to criticise elsewhere in the performance. The whole mid-to-treble balance and transition now sounds beautifully smooth and well ordered. Interestingly, and tending to confirm the claims regarding superior phase coherence, the image focusing is very sensitive to head position, rather in the manner of panel speakers. If imaging’s your thing, take extra car in setting up these speakers, making sure they’re truly vertical, similarly oriented and exactly equidistant from your listening seat. The payoff makes the effort well worthwhile.

The very essence of this speaker is simply that it makes listening to any source unusually easy and interesting. Speech is very intelligible, even at low listening levels, and individual accents and inflexions come through very clearly. Music sounds beautifully coherent and free from artifice, so that one is rarely conscious of any intrusion from the speakers themselves, while the brain focuses instead on the subtlety and delicacy of the music making process. All kinds of music seem well served, the A proving just as adept at conveying the texture of orchestral strings as it is with punchier and more percussive pop and rock material – indeed, drum solos come across as particularly convincing.

This is a genuine audiophile product at a very realistic price.

WHAT HI-FI - December 2005, giving the Model S their top, five star, award.

Get your finger on the 'Pulse.

What Hi-FiIf your first thought was 'MonoPulse who?', you're not alone. This is the first time we've come across this manufacturer, and we're glad we did. "Don't worry if the blue cloth/silver metal look of our pair isn't to your taste, because the company is flexible when it comes to colours. Build is fine, but these speakers lack some cosmetic polish compared to industry majors. But that's where the negatives end"

"Dynamics and detail impress. MonoPulse puts a great deal of emphasis on getting the phase accuracy between the mid/bass and the tweeter spot on. It's succeeded, with the result that Ss latch on to the leading edge of every note with breathtaking confidence. "They time superbly, and can deliver a complex rhythm track such as Gorillaz's Dirty Harry in as surefooted a manner as any speaker at this price. Detail is impressive and dynamics vivid. Carefully matched, the Ss give the class champions something to think about."

"Verdict. Great for the money. A fast, dynamic sound; tracks rhythms superbly; fine integration between the drive units. Five stars

HI-FI CHOICE - September 2005. MonoPulse Model A, by Paul Messenger.

Unusual in every respect, does MonoPulse challenge stereotypes?

Hi-Fi Choice A relatively new name on the scene, MonoPulse loudspeakers were conceived and created by hi-fi enthusiast Allan Hendry, who spent much of his professional life working in pulsed-array radar systems. That experience made him particularly conscious of the importance of phase relationships, and he’s subsequently applied that know-how to the integration of bass/mid driver and tweeter through the crossover region."

"The result was the creation of a range of MonoPulse loudspeakers. We reviewed the first of these, the MonoPulse Model S, with very positive results. So this time we’re checking out the top-of-the-line Model A, a radically styled 40-litre two-way floorstander that comes in a wide range of colours and finishes. A reflex port is fitted into the base of the enclosure, firing downwards and held about five centimetres off the floor by some very well founded and purposeful spikes. As part of the time alignment, the two drivers are mounted on separate baffles, so the bass/mid driver fixing is nearer listeners than the 28mm soft dome tweeter. This also provides some mechanical and acoustic isolation between the drivers. "The two separate grille cloths are available in a variety of colours. Connection is made via twin terminal pairs, allowing the bi-wiring or bi-amping."

"Sound quality. MonoPulse refers to a concept it calls ‘impulse synchronism’ as the key ingredient that distinguishes its loudspeakers from its rivals. And, as soon as the speakers were connected up, it was immediately obvious that they offer something very special in the way the leading edges of voices and musical instruments are defined. As a direct consequence, music is delivered with a dynamic vividness, integrity and sheer excitement."

Hi-Fi News - July 2005

Phase change.

Hi-Fi NewsYour speaker's drive units may be connected out of phase. It isn’t faulty – it was designed that way. But, asks Keith Howard, is this really a good idea?

If you are familiar with the design of loudspeaker crossovers, you will know it is common practice to internally connect up drive units with opposite polarities. Average hi-fi users, with the familiar warning about connecting speakers to the amplifier with consistent phase (red erminal to red terminal, black to black) ringing in their ears, will find this odd.. It turns out that the knee-jerk reaction to consider it strange may be the right one. Some loudspeaker designers have come to the conclusion that it is a bad habit the audio industry should break. Talking to a succession of speaker designers in recent months, they have mentioned a factor which isn’t often heard about – loudspeaker impulse response - and the impulse response of a typical multi-way loudspeaker is not a pretty sight.

"MonoPulse speakers have been designed with impulse response firmly at the top of the agenda. "Allan Hendry [see the March issue review of the MonoPulse Model S] justifies his unusual choice of crossover filters on the basis that it allows the bass-mid unit and the tweeter to be connected in phase. "If you put an impulse into a speaker with opposed driver polarities, then as one diaphragm moves forward, the other will move back – an intuitively undesirable situation, particularly given the established significance of leading-edge transients in music.

The ENGINEER - July 2005

Hi-fi entrepreneur Allan Hendry's loudspeakers garner high praise from music buffs .

MonoPulse, a loudspeaker company that is attracting rave reviews from the critics. Is it a consortium of of German PhDs perhaps? In fact the answer is Allan Hendry, an engineer turned hi-fi entrepreneur. The name MonoPulse relates to the radar technology he was involved with."

The specific technical issue to which Hendry turned his attention is the time domain accuracy of a speaker. They look as they are intended to function, style does not compromise function.

Hi-Fi News - May 2005

MonoPulse erratum.

Hi-Fi NewsRegrettably, due to a production error, the final paragraph in Keith Howard's review of the MonoPulse Model S loudspeaker was omitted from the March issue. 'Its fundamental honesty of sound is its key attribute and opens the window on a musical performance in way that many slugged-sounding speakers – of which there are still too many – never can. This is what real high fidelity is all about, and it will deservedly win the Monopulse Model A many friends.

HI-FI CHOICE - April 2005.

MONOPULSE MODELS

Hi-Fi ChoiceIndependent loudspeaker specialist MonoPulse has upgraded its distinctive speaker range for 2005."

Each custom-built pair comes in a choice of colours and finishes."

Hi-Fi News - March 2005. MonoPulse Model S, by Keith Howard

With an unusual crossover design and distinctive looks, this loudspeaker preserves musical 'attack' above all else.

Hi-Fi NewsIn a world of clones – which might be considered evidence of convergent evolution or lack of imagination, depending on your frame of mine – it is a pleasant change to encounter a loudspeaker that’s a little different, outside and in. The MonoPulse Model S, designed and made in the UK by Allan Hendry, is nothing if not distinctive, from the stretched cloth covering that defines its appearance, to the philosophy that underlies its creation.

Hendry’s guiding design principle is the maintenance of leading-edge information – the ‘attack’ portion of musical notes that is known to be so vital to our perception of each musical instrument’s distinctive character. "To achieve this, he deploys an unusual form of asymmetric crossover.

Buyers can choose from a variety of fabric colours for the cabinet covering. If you move house or redecorate then the covering can be changed to suit.

It seems to have an unusually ‘quiet’ cabinet for a floorstanding speaker in this price category. Despite the relatively large area of the cabinet’s panels there is little sense of it contributing unwanted output, the sound being free of tell-tale boxiness. This helps you appreciate the Model Ss even response down to what are quite low bass frequencies for its size. At the other end of the frequency range the decay spectra confirmed that the tweeter, despite its soft dome, is free of the diaphragm resonances that used to add a sibilant tizz to drivers of this type. As a result, the Model S's treble is clean and detailed. Set up as I’ve described the Model S gave a fine account of itself, at least as good as any speaker I’ve heard at this price. Its fundamental honesty of sound is its key attribute and opens the window on a musical performance in a way that many slugged-sounding speakers – of which there are still too many – never can. This is what real high fidelity is all about, and it will deservedly win the Monopulse Model S many friends. Keith Howard.

Hi-Fi News verdict: This distinctive British-made two-way majors on a transparent, honest, musically involving sound. Good bass extension.

Hi-Fi News - July 2004. MonoPulse Model A, by David Alcock

Fancy electrostatic sound from a sharp-looking conventional speaker? Meet the MonoPulse Model A.

Hi-Fi NewsCould it be that this unconventional looking two-way floorstanding is every audiophiles dream? Slim and unobtrusive, the Model A initially looks like a panel speaker, yet the aesthetics derive from designer Allan Hendry's belief that to work correctly speakers must not only be time-coherent but also phase-coherent, too.

The Model A has two clear elements to its design. The 200mm mid/bass is mounted at the very top of its enclosure, bringing its centre point as close together as possible to that of the tweeter, while the tweeter itself is set back from the main baffle to time align the two drivers. It offers 90db/W/M sensitivity (particularly suited for use with valves and class-A amps) and a power handling of up to 550 watts."

"These speakers have to be positioned very much as you would electrostatics, with the As being positioned in the location vacated by my reference SL-3 speakers. The Monopulse clearly tells you when you hit the right spot, the images locking into space. It brings the kind of resolving capability and imaging one would normally associate with small electrostatics like the Martin Logan Aerius i to a far wider audience."

"The ability of these speakers to capture subtle nuances and inflections in vocal performances is outstanding. True out-of-the-box imaging was apparent from the first notes heard, with the lateral stage extending well beyond the outer edges of the speakers and giving the illusion of imaging beyond the physical room boundaries. It is highly transparent throughout the critical midrange and high frequency band. If these abilities are high on your list of priorities for your next pair of loudspeakers, then the Model A should be a mandatory inclusion on your shortlist. And, thanks to its lower cost and ease with which it can be driven, I feel that it brings the kind of resolving capability and imaging one would associate with small electrostatics like the Martin Logan Aerius i to far wider audience. From me, that is more than enough to elicit a firm recommendation. David Alcock"

HI-FI CHOICE - May 2004.

PULSATING SOUND - New Flagship MonoPulse Model A

Hi-Fi ChoiceMonoPulse has introduced a new flagship speaker. The new MonoPulse Model A with a new bass driver said to give greater extension and control, and a claimed sensitivity of 90dB.

HI-FI CHOICE - September 2003. By Paul Messenger.

MONOPULSE Model S. A radical look and sound from a newcomer with bright ideas.

Hi-Fi ChoiceA brand new name on the scene, MonoPulse was founded by long-time hi-fi enthusiast Allan Hendry, who has experimented with speakers for decades, but until recently, earned his living in electronics, working on phased-array radar systems. It's experience that may not seem to have much relevance to speaker design, but it has made him particularly conscious of the phase relationship between bass/mid driver and tweeter through the crossover region. That's very much reflected in the way the network is designed and the drivers are spaced. A reflex port is fitted into the base of this enclosure, firing downward and held an appropriate distance off the floor by some very well founded and purposeful spikes – the footprint might be modest, but stability seems good here, helped by the 12kg total weight.

There are many exaggerated claims for superior performance in this business. Happily, the MonoPulse fully lives up to its claim that it will supply superior stereo precision and focus. The sound is pretty well balanced overall, and delivers a coherence and timing that's positively electrifying.

A vivid sound that gets you close to the music It's a vivid edge-of-seat experience, which somehow seems to 'direct-couple' the music to the brain much more effectively than most. Playing Christy Moore's Live At The Point, it was almost as though one had been transported to that famous Dublin venue. The exceptional image precision, alongside the fact that small head movements result in significant shifts in the perspectives, are very reminiscent of what one hears with wide-range electrostatic speakers – and a sure sign that this speaker does indeed have phase accuracy that's very rare indeed in a regular box speaker.

This Model S is an exceptionally creative design, not just in its unusual appearance and methods of construction, but more especially in its vivid sound quality, which simply gets you closer to the music than most of the competition. HFC

HI-FI WORLD - August 2003

PULSE POWER.

Hi-Fi WorldMonoPulse is a new British loudspeaker company which wryly states that 'the answer to life, the universe and everything is a combination of precise detail and clean, undistorted bass power', which its new Model A loudspeaker delivers.

Hi-Fi News - July 2003

New brand steals limelight.

Hi-Fi NewsNew speaker manufacturer MonoPulse has launched a range of speakers.

Using two offset drive units and sophisticated crossovers, the MonoPulse units are designed to express transient sounds with great accuracy. Bi-wire terminals and adjustable M8 spikes come as standard.

HI-FI CHOICE - June 2003

FINGER ON THE PULSE - SPEAKERS FROM ALLAN HENDRY

Hi-Fi ChoiceSpecialist privateer speaker manufacturer Allan Hendry has announced details of his latest project - five loudspeakers called MonoPulse, available from a small number of dealers.