In all fairness, you can't expect perfect sound from every seat in the house. Think about where the mixing desk is.... at the back in the middle. That is where you will get the best sound as that is where the man with all the knobs sits.

A large tent isn't ever going to be the best accoustic environment, but that is half the fun of live music. It's raw, it's mixed as it happens and is never going to sound like a CD.

If it's too loud for you, wear ear plugs. You will still hear perfectly well but it takes the edge off the air pressure and makes it more comfortable.

No point moaning about it when there is a lot you can do yourself to help matters.