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DC on the speaker outputs, Lanzar Opti 100
DC on the speaker outputs, Lanzar Opti 100
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Old 1st June 2006, 05:05 AM   #11
Perry Babin is offline Perry Babin  United States
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
The right rear seems like it's being driven 'on' which could explain the offset. The other channel is within the margin of error you stated so it's possible that it is also being driven to -16 volts.

Since you have a set of good channels, you can compare those to the defective channels. It's possible that there is a broken ground or power supply connection. I'd suggest comparing the voltages on one driver board to the other.

If you have a scope or other means of tracing the signal, drive one channel at a time to determine which pins on the driver boards are the signal pins. If you have 4 good signals going into the driver boards, you know that the problem is on or beyond the driver board.If you have negative voltage on the signal input pins of the driver board, then the problem is before the driver board.

Unless there is a broken power supply connection to the positive drivers, it's unlikely that the problem is beyond the driver board because both channels have the same problem.
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