Hi Houston

"The only thing is I am sure the acoustics were totally different in the hall pre-amplification"

I think that's more or less what I said, wasn't it ?? As I recall they had great hopes for the mushrooms ... but at the end of the day they didn't do the job as well as had been expected ,and the acoustics were still crap after all that work and effort (all that said before having a chance to check out the research paper for interest purposes.)