I've searched and cannot find an answer to this. I recently switched to banana plugs for my speaker connections to my HTR-6160. After doing that, I ran the obligatory test tones to check all connections. My left surround did not work. I don't know if this is a recent problem or not, as I have not run a test tone for awhile. I checked the wire itself with a battery, so I know that works. I even tried hooking up the speakers with just the speaker wire, without the banana plug. Nothing works. I have had issues with cheaper Sony receivers in the past, but never with a Yamaha. Is there a simple fix for this? Should I open it up and look for something? Nothing appears to be broken or loose on the back. The surround right works fine, although about a month ago I had to adjust the connection because it wasn't working. Any help is appreciated!