Gonk, by using the 7.1 audio in on the 990 arent you bypassing the procesing of the 990. Isn't the 990's processing what makes the 990 sound so great.
When using a 7.1 analog in setup would all pre/pros sound the same. What Im trying to say is would the pre/pros characteristics still come through or would the sound be colored more by the processor in the hd-dvd or bluray player.
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Family room
Outlaw 990/7125
Klipsch RF-25's, Klipsch RC-25, Klipsch RS-25, Klipsch RS-52's

Home theater
990/7125 - Until the 978 is released
Seymour Av xd 120" screen
panasonic pt-ae7000u
3 In cabinet Axiom M80's, 4 Qs8's, In cabinet EP-800 subwoofer