Well after a nearly 30 year absence from attending concerts my wife and I
attended numerous shows during the last 18 months. For the most part, these have been decent sound systems consisting of flying JBL cabs and stage or flown subs.
The disparaging part is the SPLs never reached a very high level. I read here that many venues have local ordinances preventing high SPLs.
Well, the ZZ Top show on Friday at the Beacon Theater in NYC was the only exception. The sound was loud and I estimate at least 100db during the entire show!
Vocals were very clear, and the sound did not bounce off walls causing distorted music. Bass cabs (32 - 18" sub drivers) were stage mounted and their performance was very convincing.
The hall is small - 3000 seats.