Note that you can listen to stereo source on the multizone and 5.1 in the family room from separate sources. Although most receivers will only allow you to use the analog inputs as the source for the multizone. I think the new Sony DA4es will allow digital inputs on the multizone. You should...
Several points... 1.) If a rcvr doesn't have A and B or has them but doesn't allow them to run at the same time then it USUALLY means that the amp (in the rcvr) wouldn't do well with a 4ohm load...not a good sign...like cheap sonys (non ES), stay away from 'em 2.)Now giving Joe 6pk a "B"...