I'm getting nothing out of the center channel while in 5.1 mode. I've got left and right fronts and the sub that work. I've checked the wires, connections, channel settings. Anyone know what might be wrong? Feel free to ask any questions about the setup. It's probably something easy that I've missed.
I'm assuming you're talking about a NAD T743? For the T762, when speaker b is on, only the front L/R should be working. Center/surround/fronts should work with speaker A only. I had my center channel go out but I was able to restore functionality via a reset. This was done by pressing the VIDEO and TONE DEFEAT buttons on the front panel simultaneously for about 5 seconds, turning off the power and unplugging the power cord and lastly powering it back up after a few seconds. This reset will erase all stored settings and memories. You may want to confirm that it is the same command to reset the T743.