Thanks; Introduction - EM Acoustics AQ-3 User Manual

AQ-3 Operating Instructions
Page 5

THANKS

Thank you for choosing an AQ-3 amplifier for your application. Please spend a little time
reading through this manual, so that you obtain the best possible performance from the unit
and become familiar with its operating requirements.
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The AQ-3 is designed and manufactured by MC Audio in the UK. All MC products are
carefully designed and engineered for cutting-edge performance and world-class reliability. If
you would like further information about your AQ-10 or any other EM Acoustics product,
please contact us.
We wish you many years of service from this amplifier and look forward to hearing from you
in the near future.

INTRODUCTION

The AQ-3 is the smaller four channel amplifier within the EM Acoustics range. It has been
designed to meet demands for higher power and increased efficiency, whilst still maintaining
the renowned sonic qualities and unsurpassed reliability associated with our loudspeaker
products.
Your AQ-3 power amplifier utilises proprietary designed load impedance sensing output
circuitry, which enables the amplifier to drive the high voltage swings associated with speaker
impedances of 8 ohms and above, but automatically switches to a high current/medium
voltage output required by 4 ohm loads.
Fan speed is varied as required to keep the amplifier within its temperature limits. Signal
limiters are included to protect speakers from clipped signals.
The amplifier includes full DC and short circuit protection to ensure trouble-free service even
in 'harsher' environments.
Power Reduction Circuit (PRC) and Impedance Sensing
There are two PRC circuits in the AQ-3: one for channels A & B and one for channels B & C.
When the amplifier is to be used with 4 ohm speakers (or bridged mono into 8 ohms) or if
you want to reduce the maximum power to protect the speakers, then the PRC can be
selected via the switches on the rear panel.
Whenever an audio signal of medium amplitude is present on any channel and, if the speaker
impedance on any of the channels is less than 5.5 ohms, then the Automatic Impedance
Sensing circuit will set that pair of channels to the 4 ohm position.
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