Note that Brian was against installing plate amps into his subs, especially the larger ones. Two reasons: the plate amp decreases the interior volume, and he thought that would reduce bass response slightly; also, he was concerned about vibration affecting the amp’s sound quality. I don’t know how valid either of those concerns is in practice. FWIW I use a plate amp (Dayton makes a couple of good ones) outside the unit on a homemade isolation platform.