Don't be too quick to dump on the receiver... I believe I saw exactly the same issue when I was running through the analog high-pass filter in my subwoofer.
I have never heard any specific criticism of the HK signal processing; if anything the HK bass management is felt to be very flexible and to have high sound quality.
We should both try to run the same tests with a competitive receiver before we start thinking bad of HK... right now there is no reason to believe a Denon etc... would be any different. I'm not saying I have another explanation but I don't think we should blame the receivers too quickly.
Then again if you had posted this *before* I picked up my 630 I guess I would have said "yes, dump that piece of junk before it messes up your system any more... and sell it to me"
