What is a good sounding tube amp for the stage?

We want to produce pop concerts in theatres with 2500 seats. I am trying to do it with quality sound - liquid and transparent.

Can it be done on pro audio?

I am considering EAW La speakers - will this do it, or is there better?

Is there a digital amp that will do it, or should I go with tube preamp, and transistor power amp?

How many sets of speakers do I need?

Thanks in advance...