AVS Special Member
Join Date: Jul 2009
Location: northern virginia
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Most of the time the replacement amp is slightly different in size than the original amp. In my situation, I had my son glue 2"x4"s in a rectangular shape in the rear of the subwoofer to which he attached the replacement amp. He needed to lengthen the two power cords that attach to the speaker. The old amp was 7"x13" and the replacement 8"x12".
Sometimes, it is somewhat difficult to take off the old amp because it has been glued down. In that situation, you need to slowly pry the amp loose. The remaining situations are when you merely unscrew the screws and remove the plate amp.
You can also contact PSB to determine whether it is possible to purchase a replacement amp (which would be the exact size that you need).