4 or 5 Channel "Stereo"

I was curious as to who here is using 4 or 5 Channel "Stereo"

I use the Halfer circuit as speaker level in my den/office with 4 channels
In my living room, I split it up into 5 channels at line level and DSP units.
(You don't need the DSP, I just used them since I had them here.)

It's interesting to listen to it and I've come to prefer it over 2 ch Stereo.

The rears are the Difference between the Left and Right and tend to not have any vocals in them
The Front Center is the Sum of the Left and Right and will contain a lot of the vocals.
 
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