The second cab needs to be an 8 ohm cab, EDIT: if you still want to use the combo speaker. Otherwise a single 4 ohm cab is fine too.
Betas dont run 2 ohms like most of the other SS sunn amps do.
It should be decently loud as a bass amp with enough speakers. If its as quiet as you say it is, I'd go have it looked at by a tech.
Last edited by mc_muench : 02-10-2013 at 04:49 AM.