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2 In - 2 Out - XLR - LittleKnob Mid Box 2×2 Monitor Controller - Phase Invert + Mono Switch Analog Speaker Box
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Amazon.com: HECCI Z1 Portable Personal in-Ear Monitor Amplifier EIMs Headphone Stereo Earphone Amp Volume Control with XLR and TRS and Stereo/Mono Switch Solution for Musicians : Musical Instruments
Using switched 1/4" jack....switching guitar cab from stereo to mono - Techtalk Speaker Building, Audio, Video Discussion Forum
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