That is the point, it is the buyers responsibility, regardless of how they feel about it.
Taken to a more extreme, I have worked with companies to resolve their use tax issues, some of whom purposely purchased from out of state vendors to avoid the tax due. They all get caught eventually...
If you are referring to walking in the front door with cash, I’m sure they appreciate you outing them online.
If you mean by shipment, they only have sales tax obligations to states in which they have a physical presence. You on the other hand have a legal obligation to pay your state the...
Running two separate heads into a stereo cabinet not wired as two independent monos, sounds like a potential ground loop buzz disaster. I would start with the volumes on “1” to check it out.