Ask an Audio geek

[Kosh]

If you're really enthralled with this, connect the left and right speakers normally, and put your difference speaker behind your listening position.  You now have a 'Hafler' surround system.  

I had my stereo wired this way in '86.

I've been using this scheme since forever as a poor man's surround sound for watching movies. It's good enough that I never had the urge to buy a proper surround decoder and amps. Everyone should try it. I hook up two rear satellites (simple JBL controls) as difference speakers with reversed polarity such that each is in phase with the main on its side if the other channel is silent. The one thing dearly missed is a center for dialogue, but I've never experimented with putting the sum there. With one amp matching levels can only be achieved via placement, but again, it was close enough that I never kept a second amp in the system for long. Of course in theory it deminishes channel separation for the mains, but with damping factors 400 and more I don't care much.

That is pretty cool.  At this point its a moot point for me since I already have the electronics.         
              
The receiver I use is an Anthem MRX-300.  It's a pretty basic no-frills unit as most receiver go.  It doesn't have any streaming, networking, or integrated blue tooth capabilities.  What is does do is have outstanding sound quality.  It also has one of the best room correction implementations available which I've found to make a huge difference.  My listening room isn't perfect since it doubles as a living room.  Good room correction can help.    

The receiver has an audio mode call Anthem music.  It can take a two channel audio signal and create a proprietary multi-channel signal out of it that I like MUCH better than some of the Dolby and DTS offerings that do the same thing.  It's a bit blasphemous from a "audiophile" perspective to do this; especially with a vinyl source.  The first time I heard big band and swing played in this manner.. I was hooked.