Certon M21 User’s Manual
6
M21 has a 12 VDC trigger input (6) and output (7). You may daisy-chain several amplifiers.
Simply connect a trigger output of one unit to a trigger input of another unit. Doing this
enables all units to be powered-up by control from your pre-amplifier, home-theater processor
or corresponding unit.
Attach the power cord between the power inlet (8) of the amplifier and a power grid outlet.
Turn the power switch at the back of the M21 to the “on” position.
Operation
Your Certon M21 is now responsive to a 12 VDC signal on the trigger input (6), and to the
actuation of the on/off push-button (9) on the front of the unit. Either or both take the M21 out
of stand-by mode, provided there is no fault condition.
The unit should be ready for operation within a few seconds. A blinking operation mode
indicator at the center of the push-button indicates that the unit is starting, while a steady light
indicates that the unit is ready for use.
Removing the 12 VDC signal and/or pressing the on/off push-button again takes the amplifier
back to stand-by mode.
When the unit switches on or off, a discrete click, pop or chirp may be heard in the
loudspeaker. This is normal for the M21, because of the absence of a relay in the audio signal
path.
The amplifier has a clip indicator (10). The clip indicator is an instrument to determine an
operating condition called clipping. Frequent clip-indicator blinking (e.g. less than a second
apart) or a steady light is generally indicative of extensive clipping that may seriously harm
your loudspeakers. Subjecting your loudspeakers to extensive clipping may void warranty.
A
low wattage amplifier like the M21 is more prone to clipping than a high wattage amplifier,
and may thus be more harmful to loudspeakers at a specific loudness than a high wattage
amplifier.
Immediately turn down the volume or halt playback in the event of a
frequently blinking or steady clip-indicator light.
Maintenance
It is recommended to use a dry non-abrasive cloth to clean the amplifier.
Do not use detergents or other strong chemicals to clean your Certon M21
amplifier.
