But, if I take an identical woofer from my M80 and attach it with the same Emo amp, it works just fine. Also, I switched channels on the amp and it made no difference. So, I don't think using the Denon amp would fix things.

Epson 8350 * Denon 4311CI * XPA-5 * M80/VP180 * 2 QS8's+M2v3-DSX * SVS PC13-Ultra ** Buttkicker LFE