The Tech 21 Power Engine is an open-backed 1x12, powered extension cab designed to be used with the Trademark It is not a standalone piece; however, it can be combined with any discrete bass preamp. You don't have to tweak your usual settings or presets. Just plug into the Power Engine and go. It has a level control, 3-band active tone control, 1/4" input, and balanced XLR input and output. You can daisy-chain any number of Power Engine together for the really big gigs. One year parts and labor warranty.
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