If someone else with a 500 can play some music with a lot of lowwww bass, and turn off the mains so you can only hear the sub, do you hear this same internal vibration coming from the port? I just clicked my "Front" speaker button on the remote to cycle to the "B" channel, which I have nothing hooked to that, but it allowed me to shut off my 60's on the "A" channel.

It seemed to be more apparent when I increased the volume to around -10 to -15 dB's on the receiver...

Randy


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