Good luck. Don't forget that you're playing for a bunch of tone-deaf drunks whose prime objective is to get laid. How much attention do you think they are paying to your sound system? As long as it doesn't sound bad you'll be fine; "good" is subjective.
Just my opinion based on playing mostly small to medium size clubs for 40+ years.
Not to mention that we are a bunch of tone deaf drunks so it should work out.