Hey there, I have an old 2x15 ampeg b25b cab. Pretty sure they're 16ohms mono, mines been rewired to do 4 ohms by the guy that owned it before me. Im about to acquire a head that will only do 8 ohms. I'm pretty bad at this tech stuff, do I have any cheap easy options? Or will I have to attempt to rewire it back to 16ohms or pay a tech to do it for me and run my head underpowered at 16 ohms.