Johnk,

You're saying that the output impedance of the Denon is around 500 Ohms? I can't find this spec in my Denon's manual. Maybe the problem is the cable. If it has a very high capacitance, it can load down the amp. I should repeat with and without the cable. But then again, I can successfully daisy chain my Sony to other amps.

John,

I'm disappointed with the small quantity of puny subs in your room \:\) .

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated