That’s a puzzlement. How do you balance a stereo mix if you’re not on center ?.
If you have a poorly designed stereo system (like most), your "stereo" mix is only a good mix where you are sitting, and likely 2-3 seats in a straight line front-to-back from your mixing position. The rest of the seats will get a poor rendition of your mix, and some of the seats off to the sides of the auditorium will only get your right channel or your left channel. If you have a well designed stereo system, your mix would be good at most seats, even if you aren't mixing from the middle since each seat should have similar coverage. Note that in wide rooms, it's basically impossible to design a good stereo system without using tricks like L-R-L-R that are of questionable validity, at best.
My design philosophy is to provide a good center cluster or exploded mono system that has even coverage to each seat. If the budget allows and the space is used for drama, I think about adding L-R "effects speakers" that don't provide true stereo coverage but do let you hard-pan effects. Then, in a professional setting or an advanced educational setting, and budget allowing, I move to a true L-C-R where each cluster attempts to cover each seat at approximately the same level and the same time.
Sometimes clients demand a L-R mono "stereo" system. I don't think this is out of total ignorance since they are thinking about the expensive stereo at home, but it can be difficult to convince people that what works at home doesn't scale up to an auditorium.
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