Jazzdogg
Less barking, more wagging!
I use to jam with a few guys In a small basement and it was not anything serious so would plug the bass into a mixer with a pair of PA cabs hooked up to everything. Guitar player did the same. We played at very low volume but I was having trouble hearing notes and could not even tell if I was playing wrong notes. I looked at the guitar channel and noticed the LF 80hz was boosted. I backed it off and whoa that was it. I could hear what I was playing.......and then I had to argue with guitardist.. Sorry for the long story.
So..... Talk to your sound guy and see if there are 80hz HPF on each mixer channel. If so.... Tell him to turn them on for all channels except kick, bass, and maybe floor Tom. (IME churches usually have issues with LF anyway so cutting LF on toms too usually sounds better). If sends to aviom are post EQ and you have low/mid sweep EQ, cut some 150-200hz on guitar and vocal channels as well as some more 80hz LF on the channel Eq's if needed.
You may be obscured by too much LF in other instruments. I know when I mix recordings and I can't get bass and kick to set well together I cut everything below 180-200hz out of guitar tracks and boost a couple db at 50hz for kick and cut a few db of bass @ 50hz. Then cut some kick @ 200-250hz and leave some room for the bass.
Really good advice here.

