I've got 2 ppi pcx 2200 amps and need some ideas for subs got lots of room for the box 8cu I've got one running a re sx10 and it bottoms out

 

There are literally thousands of possibilites, you have to provide more parameters. Price point would be a good start. After all, you could run a Focal 40 KX on each amp if you don't mind spending $3k on your subs. Just sayin ...