November 24, 2008I''ve had that problem in the past twice:
- One time it was an amp going bad.
- The other time one of the clamps in my fuse block had gotten slightly loose and the fuse would make intermittent contact. The sub moving was enough to make and break the contact every now and then.
Definitely also check the RCA feed. If you remove the feed and the sound goes away, you know the problem is before the amp. You can also run a signal to your RCA ins off of a CD player with a mini-jack to RCA plug.