First, I don't think you understood what I was saying, so RELAX, professor.
I am totally chill.
My last response to you was mostly to address this:
And even on some stages, there's very noticeable sonically empty spots because there aren't any center-fill speakers
Yes there can be a hole in the middle with a poorly implemented PA. However, if the concern is spotty coverage of the audience, amps are generally worse. The solution is better PA implementation.
This is a different issue. I agree there's a certain amount of "smearing" that goes on when a single speaker is used to reproduce multiple sounds at the same time. If you had a separate set of mains for each vocalist the resulting sound would have more depth. Not many people would argue for having a separate set of PA cabs for each vocalist. IMHO the more common solution is to use higher quality PA cabs that are capable of more depth and detail.So...what I was saying is that when you're walking around a room with PA going and amps, there is depth to the sound when it comes from various places such as PA and amps, and I never said it was equal or uniform. If fact *BECAUSE* it's not equal or uniform, and even with (or also BECAUSE) all of it's sonic imperfections, that is one of the things that gives the live sound from multiple sound sources and different and sometimes changing vantage points, an interesting depth that is missing from going ampless.
For the record I usually build a stereo mix with mild panning. The idea is not to create a stereo image for the audience; it's to open up the mix and create the perception of more depth.
There is also a certain loss of transparency when you ram a signal through a mic, mixer, and PA speakers. By this I mean the sound that comes out of the mains is not exactly the same as the original sound that comes from the amp. However, the sound from your amp typically gets darker and more diffuse as it travels over distance, so the audience is still unlikely to hear exactly what the player intended.
A well implemented IEM-based PA system can sound really good and provide a more consistent quality across the audience. A poorly implemented concert with stage amps can be an awful experience. The biggest factor is how well each approach is implemented. Assuming good implementation of both approaches: Ask two people which sounds best and there's a good chance you will get two answers. It's also likely each person will change their answer if they are asked at different points in the room.
Regarding which approach is best. I would say there is no clear winner, and each approach has a variety of different pros and cons that can vary somewhat with the situation. Using an IEM-based system can address some of the problems posed by amps. Likewise there are some things amps can do better in the hands of experienced and thoughtful pros. My perception is more and more people seem to be adopting IEMs, but I don't necessarily think everyone will ever go 100% ampless.
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. I dove deeper into the rabbit hole and bought an Orban 672A and Fender Twin Reverb loaded with JBL E120s so I could run biamp. Man that rig sounded great, but it was also rather big and heavy.