Martin Logan Ultra-Slim Motion SLM XL Series Loudspeaker



Inspired by MartinLogan's ultra-high-end electrostatic loudspeakers, the Motion Series was created to provide stunning sound for your ultimate-performance home theater or stereo.

The SLM XL Series of loudspeakers are sold indervidually to allow for you to create a true LCR system.

Code Number: MotionSLMxl. Category: .


For even greater low-end bass extension, step up to the Motion SLM XL adds adds two extra 4-inch passive radiators over the  two 4-inch high-excursion fiber cone woofers and two passive bass radiators included in the SLM and aesthetically matches 65-inch and larger TV sizes..

Inspired by MartinLogan’s ultra-high-end electrostatic loudspeakers, the Motion Series was created to provide stunning sound for your ultimate-performance home theater or stereo. MartinLogan’s dedicated in-house engineers carefully crafted the Motion Series to create an extremely affordable and compact product line that seamlessly blends our exquisite Folded Motion transducers with powerful, compact bass technology. The result is a smooth, refined sound with stunning dynamic range and jaw-dropping clarity.

The Perfect LCR System

The Folded Motion tweeter has an 80° x 80° dispersion pattern, which allows the Motion SLM to sound exactly the same in a horizontal or vertical orientation, making them perfect for Left-Center-Right (LCR) system applications. The logo on the grille is magnetic and can move and rotate to the proper atheistically pleasing location in any orientation.

Each speaker includes “kick-stand” brackets that attach to the back of the cabinet, allowing them to free-stand for center channel applications. The stands are easily adjustable with the provided screw feet.

Slender Profile & Stunning Performance

The secret to the Motion SLM’s outstanding performance is the innovative dual 4-inch, ultra-slim fiber cone woofers and dual 4-inch high-velocity passive bass radiators, paired with a Folded Motion tweeter to create stunning acoustical alchemy typically found in much larger speaker systems. Hidden discretely underneath the grille, the drivers are held securely in place by a solid, black-anodized brushed aluminum baffle. The high-gloss black SLM cabinet is only 1.45-inches thin, for a total wall protrusion of 1.83-inches with magnetic grille and included wall mount bracket.


Motion SLM
Frequency Response 110–25,000 Hz ±3dB
Dispersion 80° x 80°
Sensitivity 94 dB/2.83 volts/meter
Nominal Impedance 4 Ohms. Compatible with 4, 6 or 8 ohm rated amplifiers.
Recommended Amplifier Power 20-140 watts per channel
Crossover Frequency 2,600 Hz
Crossover Components Custom air core coil inductors. Polyester film capacitors in series and low DF electrolytic capacitors in parallel. Overall system thermal/cur- rent protection.
High Frequency Transducer 1″ × 1.4″ (2.6cm × 3.6cm) Folded Motion Transducer with 5.25″ × 1.75″ (13.3cm × 4.4cm) diaphragm
Low Frequency Driver Two 4” (10.2cm) paper cone. Two 4” (10.2cm) paper cone passive radiators.
Binding Posts Low-profile push style
Weight 6.5lbs. (3kg) each
Overall Dimensions
25.3 x 6.4 x 1.83 (64.2cm x 16.2cm x 4.75cm)
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