Realism - in three sizes and many colours.
They are:
The Model A - Audiophile
The Model S - Slim (right)
The Model C - Compact
The sizes:
Model A - 23cm wide and 110cm high.
Model S - 18cm wide and 92cm high.
Model C - 18cm wide and 48cm high
And the colours?
There is a choice of ten cloth colours and six steel colours – for sixty combinations to go with almost anything. Each delivery is custom made to your choice. To look at more of the colours click here
The Model A - Audiophile. No compromise hi-fi loudspeaker design.
Shown right in Burgundy cloth, with Gunmetal steel, this is a major visual statement as an audiophile speaker, at 108cm high x 23cm wide x 25cm deep, and 25Kg each.
Purity and Power.
Power handling is 300 watts continuous, 550 watts maximum, and 1,500 watts for 10ms.
The 200mm, 8 inch, Kevlar-coned LF drive units, large for the relatively slim enclosures, have 4 layer voice-coils and 40oz magnets. They have long excursion before they become non-linear, so even at high volumes with high bass content, there is no uneasy feeling of overloading.
They are coupled to separately suspended ferrofluid-cooled, 28mm, silk domed, 30kHz, HF drive units with Neodymium magnets. These are rated at 500 watts for 10ms.
To further enhance HF precision, the Model A design incorporates a foam acoustic break to minimise coupling between drive units.
This is shown right.
So for Hi-Hi News, "High frequencies were richly detailed, ensuring that instruments buried way down in the mix are clearly discernable as individual".
And for Hi-Fi + it is "the sheer speed and integrity of its music making."
For What Hi-Fi "rhythmic integration of instruments is seamless, allowing you to identify individual strands with ease."
For Hi-Fi Choice "The first thing one notices is just how coherent and 'real' it sounds. Timing is truly exceptional."
Frequency response.
Is from below 20Hz (as measured by Hi-Fi Choice) then up to a fantastic 30kHz - perfect for vinyl sources.
Impedance.
This is a valve amplifier friendly easy drive of 8 ohms nominal, with a minimum of 7.5 ohms.
Sensitivity.
One Norwegian customer is delighted with using a six watt single-ended valve amp. Look at the Norwegian section here.
We specify the sensitivity at 88dB. The high drive-impedance reduces the measured figure, but these speakers are very efficient, so give good output levels. The combination is ideal for valve amplifiers, and makes them much less sensitive to differences between solid-state amplifiers.
Despite the Norwegian report, we recommend valve amplifiers have a minimum of around 18 watts, and solid state amplifiers around 35 watts.
The rear view shows the foam covering which minimises unwanted acoustic emissions.
The heavy steel surround looks after unwanted acoustic emissions from the sides.
Set into the front of the Model A are steel vibration-damping bars. (shown right) They are handed and optimally placed to break up front-panel resonances.
They can be internal, or optionally external (pictured right) in a finish to match the main steels.
Click for more A Model specification and usage details
Click here for All the Model A reviews
There are a limited number of lower-powered Model A pairs available at some dealers. These have 300 watt maximum power. They are available at £2,445.
For full surround-sound with the fantastic MonoPulse realism, in a matched and balanced system, we offer units based on the high specifications of the 250 watt, Model C. The total system maximum power is 1,850 watts.
Model CM - Centre unit, 45cm wide x 19cm high x 20cm deep.
Model CW - Wall mounting units - 35 high x 18cm wide x 20cm deep.
Floor or stand mounted Model C pairs can also be used as rear units.
The Model S - Fantastic realism and sound-staging, in an elegant package.
Slim and Elegant.
92cm high x 17.5cm wide x 20cm deep, and 12Kg each. Shown right in Champagne cloth with Metallic Black steel tops.
With Power.
Offering 300 watts maximum and 150 watts continuous power, this slim package manages to embody 160mm, Kevlar-coned LF drivers with 54mm 4 layer aluminium voice-coils.
These are coupled to ferrofluid-cooled, 28mm, silk-domed, 30kHz, HF drive units with Neodymium magnets, rated at 500 watts for 10ms.
What Hi-Fi immediately gave the Model S their top, 
award.
"Extraordinary powers of timing and resolution; ...timing ...almost ridiculously good. Music is delivered with a sublime rhythmic precision, a shapely sense of phase and beat that makes other loudspeakers sound blurred and hazy by comparison.
The Model Ss do one thing well - like Jimi Hendrix did just one thing well. They do that one thing so staggeringly well that you could spend years enjoying that one talent."
Frequency response.
Is from 27Hz to a fantastic 30kHz, which is perfect for fully reproducing vinyl sources.
300 watt power-handling clearly means these speakers can produce high sound levels. The Model S design has a controlled mid-range response, so avoids an over aggressive, or shouty character which can otherwise happen at high volumes.
Impedance.
8 ohms nominal, 8 ohms minimum. That minimum impedance is touched at five at points across the frequency range. The result is a wonderfully balanced load for any valve amplifier.
Sensitivity.
We specify the sensitivity at 87dB. The high drive-impedance reduces the measured figure, but these speakers are very efficient, so give good output. The combination is ideal for valve amplifiers, and also makes the Model S much less sensitive to differences between solid-state amplifiers.
We recommend valve amplifiers have a minimum of around 18 watts, and solid state amplifiers around 35 watts.
Shown left, the neat high-gloss rolled-steel top, and above, the colour-matched foam insert.
Click for more specification and usage details » or Look at all the Model S reviews >>
There are a limited number of lower powered Model S pairs available at some dealers. These have 250 watt maximum power. They are available at £1,395.
For full surround-sound with the fantastic MonoPulse realism, in a matched and balanced system, we offer units based on the high specifications of the 250 watt, Model C. The total maximum power is 1,350 watts.
Model CM - Centre unit, 45cm wide x 19cm high x 20cm deep.
Model CW - Wall mounting units - 35 high x 18cm wide x 20cm deep.
Floor or stand mounted Model C pairs can also be used as rear units.
A perfectionist design, but still the lowest cost, custom-made, hi-fi loudspeaker in the market.
In a package, only 49cm high, 18cm wide and 20cm deep, all MonoPulse impulse and time alignment is retained, giving its presence and sound-staging. For more about this click
Impedance is 8 ohms nominal, 7 ohms minimum, and the sensitivity is 86dB.
The frequency range is 32Hz to 30kHz, and power handling is 250w max, 125w continuous.
The 135mm Kevlar-coned bass/mid drivers have 4-layer voice coils. The HF units are ferrofluid-cooled, 28mm, silk domed, with Neodymium magnets, rated at 500 watts for 10ms.
Shown above right is the bi-wire terminal panel and the rear port.
The image to the left shows the high-gloss steel top.
Both show the colour-matched sound-deadening foam on the top rear.
To suit stands, or shelves of different materials, the Model C can be provided either with miniature spikes or stable hard-rubber feet.
Click for more specification and usage details
For surround sound all the acoustic performance of the Model C is available in centre units or wall mounting units.
Middle - The Model CM, pictured to the righ is 19cm high and 20cm deep and 45cm wide.
Wall - The wall units, Model CW, are smaller than the Models C or CM, being 35cm high, 18cm wide, and 20cm deep, but still retain the 250 watt maximum power handling.
General options available on all models.
The main options are the colours – for details see colour options
We can sometimes obtain other colours to special order.
Because all our speakers are made to order, we can often supply to other special requirements. For example, shown right, is a connection panel, from a source specified by the customer, fitted at the very base of the enclosure.
We can also make acoustic specials with modified bass or treble.
Hard nylon "spikes", more suited to hardwood floors, can be fitted as a no-cost option. Also, extra long spikes to give stability and clearance on deep carpets can also be supplied.
All MonoPulse hi-fi loudspeakers have the total impulse precision needed for realism and sound staging.
Sound absorbent foam prevents unwanted emission from the rear of the enclosure.
All models are bi-wireable, or bi-ampable, and can accept 7mm spade connectors, 4mm plugs, or 5mm wire. They have all-soldered internal connections.
All crossover components are to the highest specifications, exclusively using heavy-duty air-spaced inductors and film capacitors.
All external surfaces can be re sprayed or re covered for repair or colour change.
The MonoPulse impulse accuracy gives a power of imaging which can be used to give dramatic results with the units well apart.
Wide separation, taking the units almost out of side view, can give a panorama of sound with no apparent source – almost surround-sound - but with better forward imaging.
Try placing the units 3 metres apart, with only 2 metres from the listening point to the line between the speakers – a configuration which can also be used to solve placement problems in smaller rooms.
Design Objective.
All MonoPulse loudspeakers have the primary objective of realism and precise imaging by time-domain synchronism of the impulses and musical leading edges in sounds.
The Model A is also a top quality hi-fi loudspeaker in all other respects, featuring a bass response down to 20Hz, and HF response up to 30kHz.
Description.
To achieve this time-domain accuracy, the MonoPulse Model A has precision-spaced drive-units combined with a unique and patented asymmetric crossovers. They use only film capacitors and air-spaced coils.
The HF circuit is fourth-order, with 24dB per octave attenuation from 4kHz. This gives superb protection of the 28mm, ferrofluid cooled, silk domed, Neodymium magnet, HF units, which then operate up through to 30kHz.
The LF crossover is second order. The bass response of the 200mm LF units, with 1 kg magnets, in generous box volumes, is extended with a reflex tuning point at 36Hz, giving an in-room response down to 20Hz.
Room Positioning.
The centres of the LF units are 85cm from the floor. Try to avoid having the front of the speakers also 85cm from side walls or rear walls. If one has to be less, try to make the other one greater. Close to a rear wall is OK, if they are about 1.5 metres or over from side walls - or vice versa. But remember that probably 80% of speaker installations are not able to fully comply with these guidelines - so treat them as a help to achieving the best in any situation - not an absolute rule.
The bass alignment is sub-flat, to meet the likely preferences of audiophile equipment owners, but if there is unwanted bass emphasis, we can supply (FOC) bass damping adaptors to be fitted in the downward-firing bass ports.
A text-book placement is with the units 2.5 metres apart at a listening distance of about 3 metres, and this works well.
The MonoPulse impulse accuracy can also give dramatic imaging with the units further apart and closer in than normal.
This ability can be useful if there are positioning problems, particularly in small rooms. Putting the units up to 3 metres apart at a distance down to 2 metres, taking the units just out of side view, gives a panorama of sound with no apparent source. Some users liken this wide separation to surround-sound - but without the noises from behind.
The upper-register subjective response can be adjusted, either pointing the units directly at the listening position for maximum treble, or slightly away to each side to reduce it.
Adjustment for Listening Height.
The Model A produces a horizontal fan of time-domain synchronism at 95cm high.
If the normal listening height will be outside 80cm to 120cm, (a low sofa to an upright chair), adjust the spike lengths to a 5mm front/rear difference to tip the speaker slightly forwards or backwards. (Testers - place the mike 95cm high.)
The spikes can be used to slightly adjust bass response. Shortening will give more emphasis but less extension - and vice versa. The normal range is for the base of a speaker to be 40 - 50mm from the surface below it.
We can supply extra-long spikes for more extreme adjustment or for clearance and stability on thick carpets.
Alternative nylon "spikes" with rounded ends can also be supplied which are more suitable for hardwood floors.
Steel finish.
The industrial quarter-inch black rolled-steel surround is akin to a natural product, with each batch having a different patina from the steel-mill’s rollers. We finish the very top of the steel in high gloss, but intentionally etch the sides where the hi-tensile bolts are, to bring out its natural graining and show its true nature.
Cables and Connections.
The terminal panel will take 4mm plugs, 7mm spades, or 5mm bare wire.
The HF terminals are the upper ones, the LF the lower, and the units can thus be bi-wired or bi-amped.
The interconnection cables needed, will depend on the system and the layout - please consult your dealer.
Running in.
We recommend that the speakers are run in for at least 50 hours at the intended listening volume, with occasional spells at a higher volume.
Warranty.
MonoPulse loudspeakers are covered by a one year warranty.
Repairs.
In the unlikely event of overheating damage to an HF unit which is protected by a fourth-order filter, access is by removal of the upper cover. This is best done from the back, by pushing a thin, <5mm, rod through the small hole which is at the back behind the very top rear foam flap, to the upper-right. The cover can be replaced by sliding it in from the top.
There is no removable cover over the LF unit, but this and the cloth can be replaced at the factory or by a competent repairer.
For spare HF units and other repairs, contact your dealer.
Other specifications.
Nominal impedance 8 ohms, minimum 7 ohms, average 13 ohms.
Power handling, 550 watts maximum, 300 watts continuous, and 1,500 watts for 10ms.
Sensitivity, 88dB.
Height, 108cm. Width, 23cm. Depth, 25cm. Weight, 26Kg per unit.
Design Objective.
All MonoPulse loudspeakers have the primary objective of realism and precise imaging by time-domain synchronism of the impulses and musical leading edges in sounds.
The Model S is also a top quality hi-fi loudspeaker in all other respects, featuring a bass response down to 27Hz, and an HF response to 30kHz.
Description.
To achieve this time-domain accuracy, the MonoPulse 62S has precision-spaced drive-units combined with unique and patented asymmetric crossovers. They use only film capacitors and air-spaced coils.
The HF circuit is fourth-order, with 24dB per octave attenuation from 4kHz. This gives superb protection of the 28mm, ferrofluid cooled, silk domed, HF units.
The LF element is first order. The bass response of the 160mm LF units, in generous box volumes, is extended with a reflex tuning point at 39Hz, giving an in-room response down to 27Hz.
Room Positioning.
The centres of the LF units are 75cm from the floor. Try to avoid having the front of the speakers also 75cm from side walls or rear walls. If one has to be less, try to make the other one greater. Close to a rear wall is OK, if they are about 1.5 metres or over from side walls - or vice versa. But remember that probably 80% of speaker installations are not able to fully comply with these guidelines - so treat them as a help to achieving the best in any situation - not an absolute rule.
The bass alignment is sub-flat, to meet the likely preferences of audiophile equipment owners, but if there is unwanted bass emphasis, we can supply (FOC) bass damping adaptors to be fitted in the downward-firing bass ports.
A text-book placement is with the units 2.5 metres apart at a listening distance of about 3 metres, and this works well.
The MonoPulse impulse accuracy can also give dramatic imaging with the units further apart and closer than normal.
This ability can be useful if there are positioning problems, particularly in small rooms. Wider but close spacing can give a panorama of sound with no apparent source. Some users liken this wide separation to surround-sound - but without the noises from behind.
The upper-register subjective response can be adjusted, either pointing the units directly at the listening position for maximum treble, or slightly away to each side to reduce it.
Adjustment for Listening Height.
The Model S produces a horizontal fan of time-domain synchronism slightly upwards towards an optimum listening arc 1 metre high at 3 metres away. (Testers can also place the mike 77cm high at 1 metre out.)
If the normal listening height will be outside 80cm to 120cm, (a low sofa to an upright chair), adjust the spike lengths to a 5mm front/rear difference to tip the speaker slightly forwards or backwards.
The spikes can be used to slightly adjust bass response. Shortening will give more emphasis but less extension - and vice versa. The normal range is for the base of a speaker to be 40 - 50mm from the surface below it.
We can supply extra-long spikes for more extreme adjustment or for clearance and stability on thick carpets.
Alternative nylon "spikes" with rounded ends can also be supplied which are more suitable for hardwood floors.
Cables and Connections.
The terminal panel will take 4mm plugs, 7mm spades, or 5mm bare wire.
The HF terminals are the upper ones, the LF the lower, and the units can thus be bi-wired or bi-amped.
The interconnection cables needed, will depend on the system and the layout - please consult your dealer.
Running in.
We recommend that the speakers are run in for at least 50 hours at the intended listening volume, with occasional spells at a higher volume.
Warranty.
MonoPulse loudspeakers are covered by a one year warranty.
Repairs.
In the unlikely event of overheating damage to an HF unit which is protected by a fourth-order filter, access is by removal of the rear terminal panel.
There is no removable cover behind the LF unit, but this and the cloth can be replaced at the factory or by a competent repairer.
For spare HF units and other repairs, contact your dealer.
Other specifications.
Nominal impedance 8 ohms, minimum 7 ohms.
Power handling, 300 watts maximum, 150 watts continuous.
Sensitivity, 87dB.
Height, 92cm. Width, 17.5cm. Depth, 20cm. Weight, 14.5Kg per unit.
Design Objective.
All MonoPulse loudspeakers have the primary objective of realism and precise imaging. This is achieved by their unrivalled synchronism of the all-important impulses and musical leading edges in sounds.
The Model C is also a top quality hi-fi loudspeaker in all other respects, featuring a bass response down to 32Hz, and an advanced HF unit with a response up to 30kHz.
Description.
To achieve time-domain accuracy, the Model C has precision-spaced drive-units combined with a unique and patented asymmetric crossover, using only film capacitors and air-spaced coils.
The HF circuit is fourth-order, with 24dB per octave attenuation from 4kHz. This gives superb protection of the 28mm, ferrofluid cooled, silk domed, Neodymium magnet, aluminium-wound, HF unit.
The LF crossover is first order. The bass response of the 135mm, Kevlar coned, LF unit is extended with a reflex tuning point at 49Hz, giving an in-room response down to 32Hz. This bass alignment is sub-flat, to meet the likely preferences of audiophile equipment owners.
Room Positioning.
Try to avoid having the speakers the same distance from the floor, side walls, and rear walls. Try to make these distances different. Close to a rear wall is OK, if they are away from side walls - or vice versa. But remember, most loudspeakers are not able to be sited ideally, so this is just a guide to doing the best.
A normal placement is with the units 2.5 metres apart at a listening distance of about 3 metres, and this works well. The MonoPulse impulse accuracy can give very good centre imaging with the units further apart than normal. This ability can be useful if there are positioning problems, particularly in small rooms. Putting the units 3 metres apart with the centre-line just 2 metres away, gives a panorama of sound with no apparent source.
Some users liken this wide separation to surround-sound - but without the noises from behind.
MonoPulse speakers are reasonably directional in the HF region. This does have an advantage, because the upper-register subjective response can be adjusted, either aiming the units inwards to the listening position for maximum treble, or straight ahead to reduce it.
Optimising for Listening Height.
The MonoPulse Model C is provided either with miniature spikes or stable hard-rubber feet to suit stands or shelves of different materials. Putting Blu Tack inside the rubber feet will improve the stability of these.
The focus of time-domain synchronism can be optimised by choosing a stand or shelf of the correct height for the listening position. A typical listening position turns out to be with the ears at 1m high, in which case an optimum stand height is 40cm. This is not critical to 20cm each way, so this stand height will cover listening heights of between 80cm to 120cm - a low sofa to an upright chair.
Alternatively if the listening height is the typical 1 metre, stand or shelf heights of 20cm to 60cm are perfectly satisfactory. The Atacama SL series of stands, offer a range of heights.
Outside these listening ranges the MonoPulse Model Cs will perform as normal hi-fi loudspeakers.
Cables and Connections.
The terminal panel will take 4mm plugs, 7mm spades, or 5mm bare wire.
The HF terminals are the upper ones, the LF the lower, and the units can thus be bi-wired or bi-amped.
The interconnection cables needed, will depend on the system and the layout - please consult your dealer.
Running in.
We recommend that the speakers are run in for at least 50 hours at the intended listening volume, with occasional spells at a higher volume.
Warranty.
MonoPulse loudspeakers are covered by a one year warranty.
Repairs.
In the unlikely event of overheating damage to an HF unit which is protected by a fourth-order filter, access is by removal of the rear terminal panel.
The LF unit can easily be replaced by a competent repairer. For spare HF units and other repairs, contact your dealer.
Other specifications.
Nominal impedance is 8 ohms, minimum 7 ohms.
Power handling, 250 watts maximum, 125 watts continuous.
Sensitivity 86dB.
Height 49cm. Width 18cm. Depth 20cm. Weight 7Kg per unit.
Design Objective.
All MonoPulse loudspeakers have the primary objective of realism and precise imaging by time-domain synchronism of the impulses and musical leading edges in sounds.
The Model 42A is also a top quality hi-fi loudspeaker in all other respects, featuring a sensitivity of 89dB, bass response down to 25Hz, and HF response to 30kHz.
Description.
To achieve this time-domain accuracy, the MonoPulse 42A has precision-spaced drive-units combined with a unique and patented asymmetric crossovers. They use only film capacitors and air-spaced coils.
The HF circuit is fourth-order, with 24dB per octave attenuation from 4kHz. This gives superb protection of the 28mm, ferrofluid cooled, silk domed, Neodymium magnet, HF units, which then operate up through to 30kHz.
The LF crossover is second order. The bass response of the 200mm LF units, with 1kg magnets, in generous box volumes, is extended with a reflex tuning point at 39Hz, giving an in-room response down to 25Hz.
Room Positioning.
The centres of the LF units are 85cm from the floor. Try to avoid having the front of the speakers also 85cm from side walls or rear walls. If one has to be less, try to make the other one greater. Close to a rear wall is OK, if they are about 1.5 metres or over from side walls - or vice versa. But remember that probably 80% of speaker installations are not able to fully comply with these guidelines - so treat them as a help to achieving the best in any situation - not an absolute rule.
The bass alignment is sub-flat, to meet the likely preferences of audiophile equipment owners, but if there is unwanted bass emphasis, we can supply (FOC) bass damping adaptors to be fitted in the downward-firing bass ports.
A text-book placement is with the units 2.5 metres apart at a listening distance of about 3 metres, and this works well.
The MonoPulse impulse accuracy can also give dramatic imaging with the units further apart and closer in than normal.
This ability can be useful if there are positioning problems, particularly in small rooms. Putting the units up to 3 metres apart at a distance down to 2 metres, taking the units just out of side view, gives a panorama of sound with no apparent source. Some users liken this wide separation to surround-sound - but without the noises from behind.
The upper-register subjective response can be adjusted, either pointing the units directly at the listening position for maximum treble, or slightly away to each side to reduce it.
Adjustment for Listening Height.
The Model 42A produces a horizontal fan of time-domain synchronism at 95cm high.
If the normal listening height will be outside 80cm to 120cm, (a low sofa to an upright chair), adjust the spike lengths to a 5mm front/rear difference to tip the speaker slightly forwards or backwards. (Testers - place the mike 95cm high.)
The spikes can be used to slightly adjust bass response. Shortening will give more emphasis but less extension - and vice versa. The normal range is for the base of a speaker to be 40 - 50mm from the surface below it.
We can supply extra-long spikes for more extreme adjustment or for clearance and stability on thick carpets.
Alternative nylon "spikes" with rounded ends can also be supplied which are more suitable for hardwood floors.
Steel finish.
The industrial quarter-inch black rolled-steel surround is akin to a natural product, with each batch having a different patina from the steel-mill’s rollers. We finish the very top of the steel in high gloss, but intentionally etch the sides where the hi-tensile bolts are, to bring out its natural graining and show its true nature.
Cables and Connections.
The terminal panel will take 4mm plugs, 7mm spades, or 5mm bare wire.
The HF terminals are the upper ones, the LF the lower, and the units can thus be bi-wired or bi-amped.
The interconnection cables needed, will depend on the system and the layout - please consult your dealer.
Running in.
We recommend that the speakers are run in for at least 50 hours at the intended listening volume, with occasional spells at a higher volume.
Warranty.
MonoPulse loudspeakers are covered by a one year warranty.
Repairs.
In the unlikely event of overheating damage to an HF unit which is protected by a fourth-order filter, access is by removal of the upper cover. This is best done from the back, by pushing a thin, <5mm, rod through the small hole which is at the back behind the very top rear foam flap, to the upper-right. The cover can be replaced by sliding it in from the top.
There is no removable cover over the LF unit, but this and the cloth can be replaced at the factory or by a competent repairer.
For spare HF units and other repairs, contact your dealer.
Other specifications.
Nominal impedance 8 ohms, minimum 6.5 ohms, average 13 ohms.
Power handling, 200 watts maximum, 100 watts continuous.
Sensitivity, 89dB.
Height, 108cm. Width, 23cm. Depth, 25cm. Weight, 25Kg per unit.
Design Objective.
All MonoPulse loudspeakers have the primary objective of realism and precise imaging by time-domain synchronism of the impulses and musical leading edges in sounds.
The Model 72A is also a top quality hi-fi loudspeaker in all other respects, featuring a sensitivity of 90dB, bass response down to 24Hz, and HF response up to 30kHz.
Description.
To achieve this time-domain accuracy, the MonoPulse 82A has precision-spaced drive-units combined with a unique and patented asymmetric crossovers. They use only film capacitors and air-spaced coils.
The HF circuit is fourth-order, with 24dB per octave attenuation from 4kHz. This gives superb protection of the 28mm, ferrofluid cooled, silk domed, Neodymium magnet, HF units, which then operate up through to 30kHz.
The LF crossover is second order. The bass response of the 200mm LF units, with 1kg magnets, in generous box volumes, is extended with a reflex tuning point at 38Hz, giving an in-room response down to 24Hz.
Room Positioning.
The centres of the LF units are 85cm from the floor. Try to avoid having the front of the speakers also 85cm from side walls or rear walls. If one has to be less, try to make the other one greater. Close to a rear wall is OK, if they are about 1.5 metres or over from side walls - or vice versa. But remember that probably 80% of speaker installations are not able to fully comply with these guidelines - so treat them as a help to achieving the best in any situation - not an absolute rule.
The bass alignment is sub-flat, to meet the likely preferences of audiophile equipment owners, but if there is unwanted bass emphasis, we can supply (FOC) bass damping adaptors to be fitted in the downward-firing bass ports.
A text-book placement is with the units 2.5 metres apart at a listening distance of about 3 metres, and this works well.
The MonoPulse impulse accuracy can also give dramatic imaging with the units further apart and closer in than normal.
This ability can be useful if there are positioning problems, particularly in small rooms. Putting the units up to 3 metres apart at a distance down to 2 metres, taking the units just out of side view, gives a panorama of sound with no apparent source. Some users liken this wide separation to surround-sound - but without the noises from behind.
The upper-register subjective response can be adjusted, either pointing the units directly at the listening position for maximum treble, or slightly away to each side to reduce it.
Adjustment for Listening Height.
The Model 72A produces a horizontal fan of time-domain synchronism at 95cm high.
If the normal listening height will be outside 80cm to 120cm, (a low sofa to an upright chair), adjust the spike lengths to a 5mm front/rear difference to tip the speaker slightly forwards or backwards. (Testers - place the mike 95cm high.)
The spikes can be used to slightly adjust bass response. Shortening will give more emphasis but less extension - and vice versa. The normal range is for the base of a speaker to be 40 - 50mm from the surface below it.
We can supply extra-long spikes for more extreme adjustment or for clearance and stability on thick carpets.
Alternative nylon "spikes" with rounded ends can also be supplied which are more suitable for hardwood floors.
Steel finish.
The industrial quarter-inch black rolled-steel surround is akin to a natural product, with each batch having a different patina from the steel-mill’s rollers. We finish the very top of the steel in high gloss, but intentionally etch the sides where the hi-tensile bolts are, to bring out its natural graining and show its true nature.
Cables and Connections.
The terminal panel will take 4mm plugs, 7mm spades, or 5mm bare wire.
The HF terminals are the upper ones, the LF the lower, and the units can thus be bi-wired or bi-amped.
The interconnection cables needed, will depend on the system and the layout - please consult your dealer.
Running in.
We recommend that the speakers are run in for at least 50 hours at the intended listening volume, with occasional spells at a higher volume.
Warranty.
MonoPulse loudspeakers are covered by a one year warranty.
Repairs.
In the unlikely event of overheating damage to an HF unit which is protected by a fourth-order filter, access is by removal of the upper cover. This is best done from the back, by pushing a thin, <5mm, rod through the small hole which is at the back behind the very top rear foam flap, to the upper-right. The cover can be replaced by sliding it in from the top.
There is no removable cover over the LF unit, but this and the cloth can be replaced at the factory or by a competent repairer.
For spare HF units and other repairs, contact your dealer.
Other specifications.
Nominal impedance 8 ohms, minimum 7 ohms, average 13 ohms.
Power handling, 300 watts maximum, 150 watts continuous, and 1,000 watts for 10ms.
Sensitivity, 90dB.
Height, 108cm. Width, 23cm. Depth, 25cm. Weight, 26Kg per unit.