One more quick post...
I had a JBL Studio Sub which rated at about 350 watts...if I remember correctly. The 500 kills that sub and anything I have heard in this size range...mind you...SIZE not price. I am sure there are other subs out there that can match and or outperform the 500...but having a matching finish and matching DSP's (.....Son Protectors) is a sure necessity.

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Denon 4308
M80x2,VP150,EP600,4xQS8