Yeah - like I said, I've got the B-450 and it's slightly different in power and a few other things, but the specs from Acoustic state:
Quote:
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Rear panel features include a parallel effects loop, tweeter on/off switch, and XLR balanced Line Out with Level Control and Ground Lift. The series extension speaker jack provides an output for an additional cabinet such as the Acoustic B-115 or B-410.
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As it's designed, and although this isn't the OP question: since it already has a 115 in it, just building a stack with either a B-410 or another B-115 on the bottom would be nice. I think I would lean heavily toward another B-115 cab though.
I tend to remember that the internal driver, when you add an external cab, that they are in series and that may modify the Ohm reading somewhat from what we're used to
computating.