high fidelity stereo monitor controller

While 5.1 surround has become well established in film and HD production, stereo is still king and remains the standard for producing and delivering music. Accordingly, we offer our monitor controller in stereo only versions - the m904b..

The m904b combines all the same features and technology found in our flagship m906 surround controller, and is the perfect nerve center for any type of audio production facility - from project studio to world class mastering facility.

The m904b offers a full complement of balanced and unbalanced stereo analog and digital inputs, the latter featuring our latest generation reference 24bit/192kHz DAC technology with our proprietary s-Lock™ PLL for rock solid digital stability (more info can be found in the technical discussion). All inputs and outputs are easily user calibrated for seamless integration into any playback environment with all types of playback equipment.

The m904b is configured as a blank 2U mainframe which is controlled by a separate remote control unit (m904RCU included).

Included as a standard feature is our critically acclaimed reference headphone amplifier circuitry (as featured in our m902), with one output jack on the mainframe and one on the m904RCU. This circuitry provides absolutely pristine audiophile headphone amplification for critical monitoring, mixing and mastering.

While the m904b provides an unparalleled list of useful features, the real achievement for us was to implement all of this while maintaining our trademark musical, high fidelity audio performance. All components are selected and design decisions made for absolute audio transparency and long term reliability, making this the perfect link between your mix and monitors.

The m904b is here to empower audio professionals with the highest performance and most comprehensive feature set that any stereo monitor control system has to offer.


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  • multiple stereo analog inputs
  • 24bit/192kHz digital stereo inputs- AES3, S/PDIF, ADAT and TOSLINK
  • s-LockTM phase lock loop sample clock regeneration for ultra-low jitter and rock solid digital stability
  • precision speaker and headphone level controls with a 100dB range in 0.5dB steps
  • every electrical and mechanical design element maximized for absolute purist, audiophile performance
  • available as the m904b, which has a blank panel mainframe unit and is controlled via m904RCU (sold separately)
  • all I/O and audio are routed in the 2U rack mount mainframe powered by an internal AC supply
  • multiple speaker set selection - up to 3 stereo sets
  • m902 style high-current audiophile headphone amplifier built in with two outputs on front panel
  • complete system level calibration (inputs, outputs, inter-channel balance, dim)
  • balanced talkback microphone input and activation switch with additional external foot switch control jack
  • fixed level stereo DAC output for direct audio transfers
  • five year warranty on parts and labor



enlarged RCU frontpanel

enlarged rearpanel

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