I have a Denon 2807 and have experienced several instances of popping through my Polk Audio RM 30's. This has occurred with both DTS and Dolby Digital sources. I always attributed the problem with setting my Infinity Sub too high (gotta get that rumble you know). Nothing has ever been damaged as of yet. Whenever it has happend I just backed the sub down and all was fine. Don't know if this is the same thing or not.
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