I’m playing a bar gig and using the headliner’s bass rig. Nice enough rig: GK 700RB into a Peavey 4x10. Solid. However, he’s using an instrument cable in place of the speaker cable. Recipe for disaster, as you well know. How do I tell him? How do I warn him? Do I? I’ve a habit of running into and trying to help the kind of people that don’t want help, so i’m worried he’ll be that kind. I don’t want to rub him wrong but I don’t know that I can just ignore it and let him continue like this. Thoughts?