Check with the manufacturer. There is an issue with loading the output and causing a component failure. I've seen opamp failures from piling on too many subwoofers to a single sub output, although three is not that many. Better safe than sorry.
Thanks guys Paul I did check with B&K and it should be alright but what I was looking for was maybe a switchbox that I could possibly go into the processor and have two more outputs on the switchbox if there is such a thing.
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