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What are the two 1/4'' plugs for, next to the speaker jack?
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This probably doesn't help, but mine has two speaker outputs, which are in the same position as the two unidentified jacks on yours. It doesn't have a speaker output where your main one is.
Personally I think you should ask Tony Bruno - IMO it is unacceptable to have unlabelled jacks on an expensive amp like a Bruno.