OPERATION
Press the POWER rocker switch on the rear panel - the orange POWER LED on the front panel will light confirming that the unit is ready for use.
Audio Sense Mode
The M250 is now in “audio sense” mode, and will turn on when an input signal is detected.
When an audio signal is received the amplifier will turn on, and the blue OPER- ATE LED will be lit. If there has been no audio input for about 15 minutes the amplifier will turn off and the OPERATE LED will go out.
The M250 may be turned on or off manu- ally by pressing the power status button on the front panel.
When the amplifier has been turned on manually by the front button it will revert to “audio sense” mode if there has been no audio input for about 15 minutes.
When the amplifier has been turned off manually by the button it will stay off, even if audio input is present, until there has been no audio for about 15 minutes, when it will revert to “audio sense” mode.
If there is an audio input signal present when mains power is applied to the M250, it will turn on immediately with the OPERATE LED lit.
OPERATION
Trigger Mode
The M250 responds to a “trigger on” con- trol voltage of between 5 and 12 volts posi- tive or negative, received via the 3.5mm TRIGGER IN socket on the rear panel.
The first trigger pulse received after apply- ing mains power will turn the amplifier on, and cancel the “audio sense” mode.
When the amplifier senses a “trigger off” pulse (return to zero voltage), the amplifier will turn off.
The M250 may be turned on or off manual- ly with the front panel button at any time.
When the amplifier has been turned on manually by the button, it will turn off if it receives a “trigger on” signal followed by a “trigger off” pulse.
If the amplifier has been turned off manual- ly by the button, it will turn on if it receives a “trigger off” signal followed by a “trigger on” pulse.
To cancel trigger mode and revert to audio sense mode, first remove the trigger source. Then, using the mains switch at the rear of the unit, turn mains power off and after a few seconds, back on again.
Audio Adjustment
Select the required audio input source on your
Issue 4: May 2002
M250 Amplifier | Instructions for Use Page 6 of 8 |
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