The Coleman Audio SR5.1MKIII has been upgraded with a 47 position stepped attenuator. Fold down for stereo and mono capability. Front panel channel trims and mute switches allow proper calibration and easy evaluation of signal localization. Inputs are XLR / TRS combo jacks to allow easy interconnection with the A/B5.1 Surround Switcher, or other equipment, in any environment. Outputs are XLR connectors.