Bad idea.
If you want L-C-R or L-R to the center, get a quality passive soundbar such as one of the two GoldenEar SuperCinema 3D models (http://www.goldenear.com/products/supercinema3d) and connect the amplifier outputs to the appropriate soundbar inputs. I’ve heard it and it’s really good, esp. if you add a GoldenEar sub.
Doing it the way you propose will give you a very unsatisfactrory sound--low frequencies from one channel and high frequencies to the other sent to the center. Depending on the sound mix of the source, it may work OK on some shows but be unintelligible on others.
If you want L-C-R or L-R to the center, get a quality passive soundbar such as one of the two GoldenEar SuperCinema 3D models (http://www.goldenear.com/products/supercinema3d) and connect the amplifier outputs to the appropriate soundbar inputs. I’ve heard it and it’s really good, esp. if you add a GoldenEar sub.
Doing it the way you propose will give you a very unsatisfactrory sound--low frequencies from one channel and high frequencies to the other sent to the center. Depending on the sound mix of the source, it may work OK on some shows but be unintelligible on others.