2 12s definitely i have a cheap pioneer sub and amp and an mtx sub and amp and my friend could hear it 1000 ft away i'm only running about 500-600rms but when i turn it down its really nice to listen to
make sure the gain on the amp is turned up all of the way. the remote gain works off of the main gain so when the remote gain is up all the way it's the same as where the original gain is set at.