07-14-15: Agear
Maybe George's clever and cheeky suggestion is the answer.....:)
If one has the technical know how and measurement test CD an oscilloscope, it quite simple to do a bleed resistor for a 20hz to 20khz, soldered across left and right output, for a total reduction to 30db channel separation, takes about 10mins to do. And you can make it switchable on the fly.
http://forum.audiogon.com/cgi-bin/fr.pl?ddgtl&1398132150&openflup&2078&4#2078
Cheers George