I'm trying to find a car amp to run a Behringer 400w speaker half stack, which typically is used for guitars. This is sadly at 8 ohms. The only amps I've seen are 4 and 2 ohms, how do I run these speakers.
I don't think a guitar speaker would be a good idea to run in your car. Their not made for bass. I blew an amp once because my friend tried to play his bass guitar through it. And yes, you could run it at 8 ohms, all amps would be stable at that, some amps aren't stable at certain ohms, usually 1, and it's because too much heat is generated and it would ruin the amp. It would take a very big amp to run 400 watts at 8 ohms though. You'd have to find something that pushes 1600 watts at 2 ohms.