Pdspecl and Bruce (Bifwynne), I had looked at several pictures of the rear panel of the SP9, including at ARCDB.WS, and they show only one pair of main outs (plus two pairs of tape outs).
Excellent comments otherwise, Bruce. I would just add that according to the specs shown in Stereophile's review
, while a load capacitance of 100pf (or less) is recommended, up to 1000pf is acceptable. That would seem to make sense given the 250 ohm nominal output impedance, and might particularly be a significant fact if a y-adapter turns out to be the best approach.