Thank you for your swift response. I just found the instruction manual for the Little Bass Thing which shows a cable attached to each output port of the amp when using 2 x 8 ohm cabs but not how they join the cabs. Ade Emsley's YouTube presentation (LBT + 2x OBC112) looks like the cabs are in series. A pity the cabs didn't come with any instructions and there's no download support on the Orange site. Weirdly there's no clear and simple 'how to' lesson on YT either.They are parallel, so use either of them as input/output.