painttoad:

First, I know what it’s like. I think everyone does.

I’m surprised that your asw-210 doesn’t have any internal bracing. If I were you, I’d build new box for both subs and put adequate bracing while keeping the same internal volume. 3/4" thick MDF should do fine if you brace it properly.

For aftermarket amps, look up http://www.acoustic-visions.com/ or http://www.partsexpress.com/