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Are the 2 - 12's in the cabinet you have now 8 ohms or other? Usually Sunn amps will take 2 - 8 ohms loads with one plugged into the 8 ohm jack and the other plugged into the 4 ohm jack. The jacks are wired in parallel internally so in essence you are running 2 - 8 ohm cabinets in parallel...4 ohms.You really cannot assume that 2 jacks mean parallel or series. The only thing to do is check them. You can do this by opening the cabinets and looking or by using a multi meter. Most 8 ohm cabinets will be somewhere around 6 ohms give or take an ohm. Most 4’s will be around 3, same as above. Many cabinets have 2 jacks run in parallel so you can connect the amp to one, then the next cabinet to the first one. I would think that if your second cabinet is 8 ohms you should be fine. As long as the Beta sees at least 4 ohms, all should be happy. Take the time to review the comments about the Beta controls since the way they work is not like any other amp.

Ok, another question. I just spotted a sunn 2x12 on craigslist. My combo is 4ohm, and this sunn cab I have found is also 4ohm. Could I run the combo with the other cab which is also 4 ohms? Where would I plug in? The back of this 2x12 confuses me. I think I go from my head to the 2x12 input(the cabinet on craigslist), then out from the series and into the combo speakers making my ohmage total 8ohms. Is this correct? The back of the cabinet that is on craigslist looks like this: