I have to agree that not being able to sum the stereo signals to a mono signal without phase cancellation is a fault of the stereo output. For many years producers and engineers mixing rock music for both stereo hifi and mono AM radio signals always were careful to produce a stereo signal for records and FM radio that would still sound good when summed to mono for AM radio.

If there is a phase cancellation problem when summed to mono it is Yamaha's problem to solve not Bose for producing a mono sound system.

I recently heard a friends reggae band using acoustic drums , electric bass and electric guitar but vocals and acoustic guitar were running through the Bose Pas. I was sitting well off axis to the Bose Pas tower and it all sound great and very natural. He was running 2 Bose subs to keep up with the live rhythm section but it did that without a problem.


[This message has been edited by Nigel (edited 01-29-2006).]