No label on the cab jack plate? Almost all Mesa cabs are 8 ohms. Even the 4 x 12s. Sometimes you need to open 'em up, no telling what the last genius did. The manual, available at the Mesa website, will tell you to plug two 8 ohm cabs into the two four ohm speaker jacks. SOP.
Thanks guys. I am so lazy. The answer is right in the owner's manual.
Just trying to get a more rangy sound out of my combo. I thought if anyone else had used their 5:50 with an extension cab I would get a suggestion or two.
Thanks again.
