I have had this sub for years sitting in my dads living room. He hates bass, so it's been sitting unplugged. Today I hooked it up, and noticed that it was cutting out (going into standby, then turning back on) when the receiver sub level, or sub-amp gain was above a certain point. I would assume it's a problem in the amp.

Are there any plate amps sold here that would be a relatively direct replacement? I can get actual dimensions if needed. There don't appear to be many specs for this model online. Also since I'll have it apart, any good 15" that would be a bit more musical? The existing sub appears to be relatively cheap.... ribbed, laminated paper cone, vented voice coil, decent size magnet. It actually has a rubber surround, though.