Thank you for the advice Alan and terzaghi. I very much appreciate it! I'll check that tonight when I get home, because it sounds like it's close by the amp section, but like you said, it could be something totally different in my room that's rattling.

2 = M60,4 = QS8's,1 = VP150,1 = EP350,1 = EP500
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Optoma HD70,110" DIY screen
Xbox360 & PS3