Was just able to get back on here. What I would like to do is use this receiver for a bonus room system with the A fronts as part of a 5.1 setup, and the B fronts feeding a pair of deck speakers. I've reset to factory defaults, run the setup menus, checked test tones on all speakers and all work fine except the left front when B is selected. When I hooked up the speakers the first time, the + left front B was very difficult to open/close the binding plug, as if the threads were stripped. It's possible there could be mechanical damage inside if someone wrenched the plug somehow. Thanks for the suggestions. And to razel, yes, a $25 flea market find.