Used M3PH MKIII Pro Sound Product

This Coleman Audio M3PH MKIII Monitor Controller is a high-end passive studio monitor management system designed for engineers who demand transparent signal routing and precise level control. Featuring four balanced stereo inputs, three balanced stereo monitor outputs, a precision 47-position stepped attenuator, dedicated headphone output with its own level control, mono summing, polarity reverse, and independent left/right mute functions, it delivers the flexibility of a professional console monitor section in a compact 1U rackmount format. Its passive signal path ensures your audio remains uncolored and free from added noise.

This monitor controller is an outstanding choice for mixing, mastering, and critical listening applications where accuracy is essential. The stepped attenuator maintains channel matching within ±0.05 dB, making repeatable listening levels easy to achieve, while the ability to switch instantly between multiple sources and speaker pairs streamlines workflow. Engineers also appreciate the mono and phase functions for checking mix compatibility and identifying playback issues, along with the option to dedicate one output for metering or cue feeds.

Every used item we offer is thoroughly inspected and tested before it reaches our showroom floor. We buy, sell, and trade used musical gear every day, so our inventory is constantly changing. Please review all of the photos carefully, as they provide the best representation of the unit's cosmetic condition and may show signs of normal use that are not specifically mentioned in the description.