Depending on the movie and the system volume, I will periodically hear loud, nerve-jangling pops coming from my S10 subwoofer during bass heavy sequences that don't just take you out of the movie, they're like getting stabbed in the ear drum.  I've experimented with various levels on the receiver (an Onkyo TX-SR674 with the levels on the receiver set using their automatic microphone setup process) as well as the sub itself (connected with a Y cable purchased from Aperion) and the only thing that ever seems to eliminate the rather unpredictable problem is by turning down the level knob on the sub.

The extra-annoying thing is I can go for months without hearing it and without ever altering any the levels on the sub or receiver (other than overall volume, of course) and then it'll crop back up at an inopportune time and I'll have to tweak the sub knob lower.  So my question is this, is my S10 blown or otherwise physically damaged on the insides?  Or am I just pushing it beyond its means?  This problem has been occurring on an irregular basis since I first got my Aperion set 3 years ago.  My warranty will be up on it in a matter of weeks, so I'd like to know if I can RMA it or if I should just bite the bullet and buy a Bravus.