Rolls RM67 Single Rack Space Mic/Source Mixer for Install Applications - 3 XLR+3 Stereo Source InsThe RM67 is a single rack space mixer designed for the install contractor market. The unit mixes three balanced microphones with four stereo sources to mono or stereo balanced outputs,the XLR Microphone Inputs have Mic Line level switches, a send return Insert jack, and individually switchable +12 VDC phantom power. Priority talkover, with variable Duck Sensitivity is available on one microphone for paging, and on one Source input for use on a