The largest venue I've ever performed was a Concert In The Park in Aberdeen, Maryland, an area the size of a couple football fields. I never turned the L1 beyond 1/3 volule and everyone, including those sitting 600 feet away, could hear me just fine. The largest indoor job was for about 500 people and I never turned the volume beyond the 25% level. Anything more and I would have blown the windows out.
I use a Yamaha PSR-3000, do lots of vocals, use a few midi files, and on breaks some MP3s.
Cheers,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)