Efficiency is also maximised. With much smaller transformers than a conventional
supply, there is much less loss due to transformer resistance and much less power
wasted as heat in the power supply.
Regulation of the SMPS means that the power amplifier will produce the same power
output, even if the AC line voltage drops by 20%.
Minimum Load Switches (MLS™)
Because the SMPS is regulated, the maximum power available for the output stages
can be adjusted without increased heat dissipation or efficiency loss. This allows the
user to match the output power with the loudspeaker impedance.
Protection
The MA4.2 amplifier has many advanced protection features that will protect both the
amplifier and the speakers connected to it, under fault conditions. All protection
circuits are independent and inaudible in normal use.
Clip Limiters
Clip limiters prevent dangerous clipped signals reaching the speaker. They work by
monitoring the output to check for signals not present at the input i.e.distortion. If
distortion exceeds 1% on an output, the limiter will reduce the input signal
proportionally.
Thermal Protection
Thermal Protection circuitry prevents the amplifier from running at an unsafe
temperature by muting the input signal when the internal temperature rises above
90°C.
Short Circuit Protection
The MA4.2 amplifier is completely short circuit protected. The protection circuits
permit very high peak currents, but maintain the output devices within their safe
operating area.
Mains Voltage Protection
This operates if the mains voltage falls outside its permitted operating range. If this
occurs, the power supply will shut down until the correct mains voltage is restored.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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