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About the Mt Actlye
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Better amplifier/speaker coupling for woofers.
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Better crossover performance working into a constant impedance load.
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Better subjective sound quality than high level (passive) networks.
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Easier conkol over driver sensitiviff differences.
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Easier manipulation of phase, time delay, resonance, and various kinds of
shaping, contouring and equalization.
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sgeSifically in the case of the Mr Active, the wide, mid-frequency polar response
of the tweeter can be utilized down to a low 1500H2 thereby mutir,g *or"
'
cohesively with the 6.5 non-woven carbon fiber (NWCF) woofer. Tii" lo*
crossover is only possible through the use of a very steep, electrotic eighth-order
(48 dB per octave rolloff) high pass filter.
The Ml Active power supply
P"
M1 Active employs a regulated switching power supply. This type of supply
has previously only been available in amplifiers sold at the very high end of tire iro
Audio market.
Most power amp customers are familiar with the large transformer and output
capacitors in high quality amplifiers. These large components are used to lieep the
amplifier's supply rails as close to DC as possible. For traditional supplies, bigger is
better.
Brt by using Pulse width Modulation (PWM) and output voltage feedback in the M1.
Active, we have the equivalent of near-infinite transfonner and output capacitors,
but at a fraction of the cost. PWM provides protection from line voitage surges that
would otherwise destroy the amplifier. No user-replaceable fuse is required because
nuisance tripping is eliminated. And finally, PWM practically eliminates hum
because th9 line frequency $0ru)
transformer is replaced with a very high
frequency (13Q000 Hz) transfomrer.
The regulated-supply rails increase the ampMier dynamic range and reduce clipping
distortion under heavy loading. The compact size of the supply does not
significantly reduce the intemal air volume of the speaker cabinet. And lastly, fulI
power can be maintained even with low or ',flat-topped,, line voltages.
Note, however, that this switching supply is NOT a univercal
voltage type that may be used with any input voltage in any
country simply by changing the cord. lf you wish to use thsMl
Actives in a country whose line voltage ii other than 120 volts AC
they must be internally modified or uied with a stepdown
transformer.
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IUTI ACrTG
RffiE
ilIAIIUAL
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