I’ll just follow up on the performance of Mozart’s Requiem I mentioned above. Just finished. I had a superb seat. Dead centre, close in. Sound was pretty good. The performance was pretty special, not just a recitation, but a full blown stage production with additional music also by Mozart. The production finished with a beautiful solo by a young and very talented boy. It was totally ruined by the LARES system I linked to above. The system clearly could not cope with the low sound levels, and was unable to work out what was going on, so it decided to treat the audience to a series of high pitched screeches and pulses at random intervals. What should have been a moving end to superb piece of music and theatre was turned into a farce. This is not the first time.
This is not directly related to the OP's question, which is about overt use of amplification for sound reinforcement. Rather this system is attempting to use technological solutions to fix poor acoustics. But they are related. Being a geek by nature, I would love the LARES system to work and solve the venues problems. The reality is that they should turn it off and leave it off.
The system also relates to the use of artificial processing to emulate multi-channel sound domestically. The LARES system came from Lexicon, which is a Harmon company, and has a direct relationship to processing used by Lexicon in domestic systems. I'm sure it lives on within Harmon, and we will see it offered in updated form in future offerings.