In reply to:

chess, are you sure that the artifact is not specific to the DSP and its firmware used in your Onkyo receiver?



No sushi, i'm not sure of that at all.
I was testing the subwoofers at the time and made a mental note that i thought the surround sounds from some of the recordings was rather odd (again something not as easily noticed when the main speakers are playing the primary volumes).
I never did go back to sift through a couple of other recordings to see how the surround sound is reproduced with DPL2. It is possible that the tracks i had heard were mixed with this effect in mind (referring to the main stereo units, not specifically the surround speakers).
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"Those who preach the myths of audio are ignorant of truth."