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The PMLBA Active Dual Channel Line Merger from Palmer is a two-channel stereo line-level merge box that can be used to merge two stereo line signals into one stereo output. It has enough amplification to boost semi-professional levels and the input channels are galvanically isolated from one another. Each channel offers a mute switch and the ability to mix the stereo signal down to mono. An example of a use for the Active Dual Channel Line Merger includes routing two mixing desks to one PA system. The line merger is housed in a 1 RU/9.5" case and has a built-in power supply.