Here is the problem:
My Yamaha RX-V496 has a three DSP programs for two channel audio that spread the stereo signals to the left and right surround channels. They are called DISCO, ROCK CONCERT & CONCERT HALL. DISCO is the least objectionable and I used to just leave that one on for all stereo input. Lately, though, I have been more closely comparing plain, two channel stereo to the DSP programs and realized that DSP does this at the expense of detail, at least with my SurroundBar 42. Playing just the stereo pair does reduce the width of the sound stage of the SurroundBar. I would like to expand it back.
Since my AVR has a B channel for stereo, my proposed solution is to connect the left and right front B channel to the left and right surround speakers on the SurroundBar to get all four channels going at once in stereo. To play 5.1 surround content I would choose just the A channel and turn the DSP effects on; to play stereo I would choose A + B and turn the DSP effects off. I have attached two PDF files with both the existing wiring and the proposed wiring (in orange and hot pink).
Does anyone see anything wrong with this idea? Would it improve the stereo performance of the SurroundBar? It would be easy to inadvertently have both surround and front signals going to the surrounds. Would that overload the speakers and damage them? I think a toggle switch before all the surround leads would solve this problem, switching between one mode or the other. There might also be a need for separate volume and delay controls.
Does such a device already exist?
Even if it did work would I void the warranty on the SurroundBar? I would ask Polk before trying this.
There are other possible solutions. Maybe more up to date AVRs have a setting that accomplishes the same thing. Or I could just save up for a good stereo pair for the B channel and leave the SurroundBar off for music.
Thanks for reading,
PS: This is what happens when you let amateurs into the forum. We start thinking.