I think I agree with John Rouse for many sound problem cases.

I was recently at a gig watching the very excellent Bob Mould play his socks off. Unfortunately, the sound was a deafening sea of middle frequencies. I went back as far as I could in the auditorium which improved things marginally and ended up standing right next to the state-of-the art mixing panel being used. I could clearly see the sound analyzer which confirmed my suspicions. The wazzock behind the desk, however, seemed completely oblivious to his carnage and more interested in his pint.

Fortunately, I have been to more concerts with good sound than bad.

Peace

moo