Compact, highly versatile enclosure
Incredible fidelity, Impressive output for size
70 X 50 degree confocal elliptic rotatable pattern
Single amplification channel with advanced passive network
Curved laminar vents for maximum LF extension
LF extension with M118 or M218


The RMS-Acoustics M12X is a coaxial stage monitor loudspeaker system, designed to deliver output levels comparable to the highest output conventional premium 2-way systems, with superior pattern control, directional consistency and a precise transient response that only a coaxial loudspeaker can provide.

The M12X features an advanced high frequency waveguide that also acts as a phasing plug for the 12” cone loudspeaker. The horn is quite large for its size, yielding consistent pattern control and a low crossover point. The phasing plug improves the response of the cone loudspeaker minimizing the equalization and phase correction needed, thus aiding the transition between sources over the crossover band.

The M12X features a 35° fold-back angle angle for monitoring application, with a clean, low profile yielding little to no impact on sight lines. Its tailor-able pattern control, easy mounting and array ability with RMS-Acoustics array brackets allow a simple, versatile, and cost effective method to tailor a sound reinforcement solution to achieve the best possible acoustical results in almost any space.

Optimized nonlinear venting improves the low frequency impedance compared to conventional enclosures, while maintaining better mechanical cone control when low frequency extension is required. The result is tight, punchy bass that also goes deep.

The M12X enclosure is crafted from premium multi-ply birch with a finely textured polyurethane finish that is impact and UV resistant. A powder-coated, punched and laser cut steel grille protects the cabinet internal from the elements. Full weather protection and custom color finishes are also available. The weatherized option provides and IP54 rating.

The optimum processed amplifier solutions for the RMS-Acoustics M12X are the Linea Research 44M10 series and 44C10 series amplifiers, with proprietary presets provided by RMS-Acoustics. All other Linea Research M series and C series amplifiers can also be used.


Frequency Range (-10dB): 50Hz – 20kHz, Assumed 100Hz low pass filter 0dB point taken at 90Hz
Frequency Response (±3dB): 65Hz – 18kHz, Assumed 100Hz low pass filter 0dB taken at 90Hz
Electrical Input Connectivity: Dual Neutrik NL4MP connectors, 2 additional NL4MPR Connectors, one on each side
Transducer Power Rating (AES) FR     570W, 1100W, 2200W ( Continuous, Program, Peak)
Long Term Power Rating (IEC) FR    1100W (4400W Peak), 2 hrs, 550W 100Hr
Maximum SPL (1m) 126 dB Continuous, 132dB Peak
Sensitivity (dB SPL, 1W, 1m) 98dB
Nominal Impedance: LF 8 Ohm
HF 8 Ohm
Low Frequency Driver 12in Neodymium cone loudspeaker with 3″ voice coil, shorting ring and high performance convective cooling technology
High Frequency Diaphragm 1″ exit Neodymium compression driver diaphragm with 3in voice coil
Enclosure Construction 15 and 18mm Birch Hardwood plywood 1.3mm layers
Suspension Attachment Proprietary internal, captive rigging
12 3/8-16 threaded eye bolts
Finish Black Polyurea/ Urethane with aliphatic UV inhibitor
Grill Details Cold Rolled steel, Epoxy powder coat, Acoustically transparent black foam backing
Dimensions W X D X H: 20″ X 18.1″ X 13.5″, 508mm X 462mm X 343mm
Net Weight 38 Lbs, 17.3 kg
Ordering Options M12X, M12Xi (Installation), M12XX (Weatherized), M12XiX (Installation Weatherized)
Color Ordering Options M12X-W (White),  M12X-C (Custom Color)


M12X-HU Horizontal U Bracket for permanent installation
WM-M Medium Wall mount with lateral orientation and vertical tilt