Stereo pre-amps with dual outs for bi-amping and a subwoofer line out

My tubed Schiit Freya has 2 single ended and one balanced out. The 2 single ended outs go to my main tube amp, and a generally not in use SS amp for "remote" speakers. No impedance issues noted, and turning the "remote" amp on has no audible effect on the main amp whatsoever. 

Rogue Audio has those features!
http://www.rogueaudio.com/Preamplifiers.htm

BAT pre amps have two balanced outputs 

Yes ...however, better sound can be had using only one pair of preamp out connections.   Listen carefully and  hear a smaller soundstage and less dynamic contrast.  Also using 1 amp of a higher quality  is better than bi-amping otherwise.

SST AMBROSIA 2000