Hi, I own a NAD T773 (V2) with Bose Acoustimass 15 and a pair of Celestion A1 (and a NAD 214 Amplifier just in case). I would like to be able to watch a movie in Dolby Digital/DTS 5.1 using ALL my speakers: 5 Bose Speakers+ 2 Celestion speakers (for the front left and front right in addition to the Bose front left and right). The bose are not really good when there is a musical part in a movie and I think they could be "helped" by the Celestion. The problem is that when I choose A+B speakers, the sound is down mixed to a stereo sound mode. I am fighting now with the MS OUT/Pre-Amp Out/Main-in settings in order to get is sorted but I didn't succeed. Does someone know how to do this with the T773 alone (using the 2 spare chanels: Surround Back left and right) or with the support of an additional stereo amplifier like my 214? Thank you in advance !