I can't comment on the Marantz but I do own the Onkyo TX-SR705 and have used it with the Oppo DV-981HD. I connected the OPPO to the ONKYO through the 5.1 analog outputs using Transparent Cables and most importantly, upgraded the OPPO's supplied power cord with a PS Audio Power Punch C-7 (at $49 a definite upgrade). What I love about the Onkyo (especially as the price keeps going down), is that I find it VERY analog-sounding. I am using B&W satellites and a B&W powered sub in my bedroom and I'm never been aware of any shrillness nor distortion (unless it exists at the source). Playing my Direct TV through the HDMI connection of the Onkyo has yielded similar results. I have both blu-ray and hd-dvd and utilizing again the HDMI through the Onkyo has been VERY satisfying. As with ALL audio equipment, interconnects, the power coming into your house and power cords (I've upgraded not only the OPPO, but the HD-DVD and BLU-RAY players) and have noticed a significant upgrade. By the way, the Audyssey room correction, which is one of the Onkyo's features, works flawlessly, is simple as pie to implement and is, in itself, worth the price of admission. Hope this info is of help......
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