Compact, highly versatile enclosure
Incredible fidelity, Impressive output for size
70 X 50 degree confocal elliptic rotatable pattern
2-way Biamplified enclosure
Curved laminar vents for maximum LF extension
LF extension with M118 or M218


The M15X is a 2-way high performance coaxial stage monitor 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. This advanced monitor employs an integrated 15” LF and 1.5” exit horn loaded HF coaxial driver design that utilizes a central neodymium magnet.

The precise 50 X 70 (h x v) constant directivity horn delivers and accurate, consistent coverage area, whether on stage, or when deployed for mains PA applications. The M15X horn features one of the proprietary RMS-Acoustics confocal elliptic waveguide shape, made with cutting edge additive manufacturing technology.

When used upright, or on a pole for mains PA applications, the horn will be in the 70 wide X 50 vertical, highly applicable to a wide variety of sound reinforcement applications.

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 M15X 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.Rubber feet recessed in the bottom panel protect the cabinet from scratching and prevent movement on stage.

The optimum processed amplifier solutions for the RMS-Acoustics M15X 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): 45Hz – 20kHz, Assumed 100Hz low pass filter 0dB point taken at 60Hz, Unprocessed
Frequency Response (±3dB): 60Hz – 18kHz, Assumed 100Hz low pass filter 0dB taken at 60Hz, Unprocessed
Electrical Input Connectivity: Dual Neutrik NL4MP connectors, 2 additional NL4MPR Connectors, one on each side
Transducer Power Rating (AES) LF     900W, 1600W, 3200W ( Continuous, Program, Peak)
HF    220W, 400W, 800W (Continuous, Program, Peak)
Long Term Power Rating (IEC) LF    1200W (4500W Peak), 2 hrs, 900W 100Hr
HF    130W (500W Peak), 2 hrs 90W 100Hr
Maximum SPL (1m) 129 dB Continuous, 135dB Peak
Sensitivity (dB SPL, 1W, 1m) 98dB
Nominal Impedance: LF 8 Ohm
HF 8 Ohm
Low Frequency Driver 15in Neodymium cone loudspeaker with 4″ voice coil, shorting ring and high performance convective cooling technology
High Frequency Diaphragm 1.4″ exit Neodymium compression driver diaphragm with 4in 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: 24.4″ X 15.5″ X 11.7″, 620mm X 394mm X 297mm
Net Weight 70lbs, 31.8kg
Ordering Options M15X, M15Xi (Installation), M15XX (Weatherized), M15XiX (Installation Weatherized)
Color Ordering Options M15X-W (White),  M15X-C (Custom Color)


M15X-HU Horizontal U Bracket for permanent installation
VCRF-EX VCRF1 Extension arm, facilitates high uptilt, downtilt, wide spaced rigging points
VC-UMOUNT Ceiling Umount for VC Cabs, hang up to 3 VCxx or VCxxWIDE