Glensound GS-TBMM002 Talkback Matrix Mixer - 12 x 12The GS TBMM002 is a 2RU subrack designed to allow easy setup and alteration of talkback circuits from simple to use front panel controls. Features such as switch mode power supply & audio transformers on both inputs & outputs make it ideal for use in demanding environments such as OB trucks. Features Transformer balanced audio inputs Transformer balanced audio outputs Switch mode power supply (90 to 250 VAC) 12 inputs 12 outputs Front panel switches