In the OP's defense, I've had a chance to interact with this sound guy, and he bulldozed any of my suggestions when he volunteered to run sound for my band. I've heard the OP play before and the bass is marginalized in the mix. I will let the OP divulge a little more but, I was frustrated dealing with that guy.
I think the problem is that some bands don't know how to use their own backline and they will gracefully hand it over to a "professional" to handle it. This particular sound guy makes his bread on being overbearing and mixing to his taste, rather than the strength of the band.
The night I had a run in with him, he failed to realize that both of our guitar players where using Les Paul's with no tone variation. To make matter worse, the guitars weren't mixed in well and one of our guys hooked up a extra stage monitor that sounded horrible. Our lead singer couldn't be heard of the the guitars that sounded like they were playing in a coffee can. My tone and the drummers were the only distinguishable instruments and that guy came after us (me primarily).
If the OP's band isn't skilled enough to take care of their own backline, then they aren't going to fight for the bassist.
I think the problem is that some bands don't know how to use their own backline and they will gracefully hand it over to a "professional" to handle it. This particular sound guy makes his bread on being overbearing and mixing to his taste, rather than the strength of the band.
The night I had a run in with him, he failed to realize that both of our guitar players where using Les Paul's with no tone variation. To make matter worse, the guitars weren't mixed in well and one of our guys hooked up a extra stage monitor that sounded horrible. Our lead singer couldn't be heard of the the guitars that sounded like they were playing in a coffee can. My tone and the drummers were the only distinguishable instruments and that guy came after us (me primarily).
If the OP's band isn't skilled enough to take care of their own backline, then they aren't going to fight for the bassist.