I feed my 990 L-R outputs to a pro digital crossover which has its 0 dBfs point at +22 dBu. The 990 is able to clip the crossover, so the outputs have great headroom (the spec is 9Vrms max). There won't be issues with *any* downstream components.
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Eric Desrochers
http://www.blu-ray.com/community/gallery.php?member=Deromax

" I hear no highs, I feel no lows, it sounds like crap, it must be Bose "