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Caution: Never listen to sound that is distorted. If distorted
sound is heard, turn the volume down immediately or speaker
and/or amplifier damage could occur that is not covered by the
warranty. If this problem persists, contact your dealer.
User adjustments and service: There are no user
adjustments on the MX1255. Your installer may make certain
gain level adjustments on the rear panel.
Caution: The MX1255 contains no user serviceable parts, so do
not attempt to open or repair the MX1255. Refer servicing to a
qualified technician only or contact the factory for information.
The Link button is normally set to the “in”
position to give all six stereo inputs individual
sources. When the Link button is set to the
“out” position, that input Left/Right is linked or
cascaded (or paralleled) to input #1 (without the use of Y
cords). Any or all combination of linked inputs 2 to inputs
6 are possible. When all inputs are linked to input 1 the
input impedance is about 4000 Ω.
Caution: NEVER connect the
MX1255 to impedances less
than 4 Ω or amplifier
damage not covered by the
warranty may occur.
The trigger is 12 VDC (35mA per MX1255) via 3.5mm
mono jack. 5 VDC trigger outputs will not work. To
connect the trigger to a receiver use a 12 VDC power
supply (we suggest Knoll PS1202 power supply with an
adaptor). Plug the power supply into the switched outlet
on the rear of the receiver. Connect the 12 volt wire to a
3.5mm mono jack. Plug the jack into the rear of the
MX1255. 12 VDC polarity is not important. Make sure the
MX1255 power switch is off (out). When the receiver is
switched on, the MX1255 amplifier is switched on.
Channel 6 can be mono bridged giving 180 watts into 8
ohms. Never connect speaker loads less than 8 ohms
to channel 6 in the bridged mode. Select the
bridge/stereo switch to the out position for the bridged
mode. The bridged input is 6L. The 6L gain pot adjusts the
bridged gain. The speaker is connected to the 6L+ and
6R+ in the bridged mode.