Originally Posted by
quackhead
Op said it happens randomly when driving...usually a bad speaker wire connection is not associated with loud sub thump...more like just cutting in and out..but, if it is the only wiring not thoroughly inspected, I would check it out. It could also be a fuse holder with a loose fuse clip, a pinched remote wire,etc. But if the amp stays on like op said, my bet would be a bad RCA cable causing intermittent signal loss and this can cause a loud thump, or diminished output....I would try a different RCA cable, since they can be had relatively cheap.