I can certainly understand wanting to hear as accurate mix as possible. I just don't know what that is. SO I have to depend on reference recordings generated in a real studio using top notch gear. Between the Bose 701s in our Surround System, the car units and various boom boxes we can get a good balanced sound.

My wife uses a single Bose system. She (and I ) feel the clarity and convenience of the system more than makes up for thr lack of Stereo spread.

As far as the Roland Digitals she has always preferred the RD700 and the previous incarnation over the Yamaha. (AFTER she sold her CP70 the Rolands were not only much lighter but she likes the Piano sound and is and has become a reference against which all others are judged. The stereo collapse is not a factor. All sound generators have mono outs now which does not adversely affect the stereo phasing issues.