Gonk - thanks for the info. On page 17 of the 990 manual, at the top, it says "NOTE: For each channel, use either a balanced or unbalanced connection. Do not use both." I don't doubt you, but why would it say this?
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Outlaw 990/7700, Oppo DV-981HD, Gallo S.A.Amp, Nucleus Ref. 3.1, AV C, AV M, TR-2, Paradigm Atom, Pioneer PDP-4214HD, Mtrola DCT6200/2005

Outlaw 990, Aragon 8008X3, 8008, Denon 3930CI, Dahlquist DQ20, Outlaw LFM-1+, Paradigm Atom, Mtrola DCT3416 I