Re: 4 channel MC-HD-Amk amp on 2 channel 08 Street Glide
Have you turned the gain control up?
The amps are shipped with the gain turned all the way down. This is the most common problem with this amp. Also make sure the HP/Full range selector switch is all the way over not in the middle.
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To err is human, but to really foul things up requires a computer. Farmers' Almanac