Curious, what's your instrumentation, and what kinds of amps does the guitar player have? where is the stage relative to the bartenders?
Lots of guitar players get 100w stacks and try to overdrive them to get "their" sound, its usually accomplished only at ear splitting volumes.
Some bars have the stage pointing at the bar, across the short dimension of the room, making it very hard to hear drink orders.
Is your drummer a basher? Can he hit light to play quiet, or is he the one driving up stage volume instead of the guitar? They're the 2 most likely culprits.
Do you guys use earplugs? Do your ears ring when you get home after a gig/rehearsal? You may be a lot louder than you think. Compared to your stage volume, it usually sounds much quieter in the audience. That isn't the same thing as being "quiet" though.
He may well have pulled the 70dB figure out of his butt, he'll let you know when its quiet enough.
Randy
3 guitars. Two play through combos and one is a half stack. Drums. 1 bass guitar (SVT/810). Lead singer.
The stage is outside so the owner was listening to us through a window where customers place orders without going inside. The stage faces the window. The building/window is on the other side of the court yard.
The drummer is not a basher. Actually one of the tamer drummers I've worked with. He said that those two songs were the quietest he has ever played on stage.
I wear earplugs as needed. I was not wearing them last night.