I've been a sound tech for years so I know about sound checking loud to have enough headroom. I also know the audience sucks up a lot of sound just being there. Here's the situation; I play for a small church, the room is 50' X 21'. We can fit about 80 people in, packed. We usually have about 40. I am the only amplified player with two guitars and congo's. I sound check loud so the guitar players can hear and we will all be playing together. We add just 30 people and I can't hear a thing! I stand right next to my GK 100W backline combo. I kept checking the settings to be sure none of the kids had adjusted it. Everything was the same as practice. I've had this happen to bass players on live gigs also, a total loss of being able to hear their rigs. I'm told the volume in the congregation sounded well blended (from a reliable source). Any thoughts and suggestions for the player to hear better? thanks for your help.