My gear:

Associated Audio / Video gear feeding the 990, with the 990's outputs feeding (via its balanced sends for all):

(3) DB Systems DB-6M (monaural) for front, center, and right channels (modified by DB Systems to include differential XLR input, additional power supply capacitance etc). Great amps...had some of these since 1980, others more recently obtained via eBay. The folks at DB Systems remind me of the Outlaws in terms of their customer service - they'll modify new, modify old...great folks to deal with.

(1) DB Systems DB-6 (two-channel) for surrounds (modified by DB Systems to include two differential XLR inputs).

(1) Velodyne F1200 servo sub (has balanced to single-ended (RCA) conversion box (Audio Control BLR-10) attached to subwoofer back). Balanced send provided by the 990's balanced subwoofer output.

Speakers are B&W Matrix 805's (not Nautilus) all around (4) with HTM centre channel (1).

All in all, I'm pretty pleased.

Mark