Originally Posted By: RobotCaleb
I'm toying with the idea of putting both devices on the speaker line with an A/B switch of some sort to choose which device is allowed to output.


That would require two sets of power amplifiers. And any switching system would have to handle the full DC wattage of what you're sending to the speakers. Most switching systems I've seen are line-level, i.e, before the amplification stage, such as the Sony XA39-II mentioned in the empeg FAQ.

Why specifically don't you want it to be an aux device?
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Tony Fabris