I am using my Fender bassman 250/210 cab with my new V4B head. Should I have my ohms set 4 or 8 with this cab. The speakers are 2 8ohm eminence 10". This set up is temporary
Second question: is a 4 ohm cabinet louder than a 8ohm cabinet?
If the speakers are wired in parallel, most likely, set to 4Ω. With a tube amp 4Ω is no louder than 8Ω. Do not connect both amps to the cabinet at the same time.