Note to Self: Connect sub to amp correctly Well I get the stupid award... I had my DIY Tumult hooked up incorrectly to my QSX PLX 2402. The amp is bridged so I should have been using the center two binding posts, but I had been using the upper two binding posts. So I guess I was using half the amp and ground. After a brief demo today and dialing back the gain about 6dB I went from being pretty happy with my Tumult to having a stupid grin I can't wipe off my face. I love it!