Well, let's just say that, if that is you AGREEING with me, no wonder you keep butting heads with so many...!
Stereo PA's been around several decades. This isn't me proposing the latest and greatest. And I honestly don't care whether anyone else uses stereo or not. But when blanket statements like "Stereo--no one hears it other than the performer" and "Stereo can only be heard by those individuals positioned within an equalateral triangular area between the speakers" are made, I think a differing opinion, and a way to FACT check it are in order.
It's pretty easy to check... Use your arranger's mono out into one speaker. Kick off the demo. Walk to the middle, then back of the room. Now hook it up to two speakers in stereo, and repeat. You ARE going to hear a difference...
Whether you want to use it, is up to you, but (others) saying that it does not exist is simply not true. Of course, Mo, this is me agreeing with you, eh?
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An arranger is just a tool. What matters is what you build with it..!