Motion SLM XL

Ultra-Slim On-Wall Speaker

The slender Motion® SLM XL speakers features an advanced resolution Folded Motion tweeter, two 4-inch high-excursion fiber cone woofers and four passive bass radiators for maximum controlled low-end bass extension - all in an ultra-slim profile designed expressly for super-thin 65-inch or larger TVs.

$749.99 each
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Ultra-Slim Folded Motion® Speakers

The slender Motion SLM speakers feature an advanced resolution Folded Motion™ tweeter, two 4-inch high-excursion fiber cone woofers and two passive bass radiators for maximum controlled low-end bass extension - all in an ultra-slim profile designed expressly for super-thin TVs.

For even greater low-end bass extension, step up to the Motion SLM XL which adds two extra 4-inch passive radiators and aesthetically matches 65-inch and larger TV sizes.

Motion SLM X3’s 3-channel soundbar design gives you a complete stereo and center soundstage, with three Folded Motion tweeters and six 4-inch ultra-slim fiber cone woofers.

Inspired Sound

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 Audible Truth About Thin TVs

TV manufacturers are pushing the physical limits of electronics, making TVs that are thinner than ever at less than 2-inches from the wall. While they look great, creating a thinner television means making compromises to the built-in speakers; tiny drivers, cheaper parts, reduced cabinet volume and placement behind the TV create unnatural, lifeless sound. Worse yet, these speakers are usually underpowered, and easily distort when you turn up the volume. Motion SLM speakers provides a clean, easy to install solution for elevating the aural experience that has been sacrificed with ultra-thin TV technology

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.


On-Wall or On-Shelf Versatility

With keyhole slots on the speaker's back panel that attach easily to the included wall bracket, you'll have the SLM wall-mounted and playing in no time. While we created Motion SLM speakers to wall mount next to ultra-flat panel TVs, that's not their only application. Included* with each speaker is a curved black base to allow them to sit on a shelf or equipment cabinet (* SLM or SLM XL only).

The Perfect LCR System

Folded Motion tweeters have an 80° x 80° dispersion pattern, which allows SLM and SLM XL 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 aesthetically pleasing location in any orientation. SLM and SLM XL both include a base designed for vertical applications, allowing the speakers sit on a shelf or equipment cabinet.


MartinLogan Motion SLM-XL Floorstanding Speaker

"“… the Motion SLM-XL speakers are the best-sounding on-wall speakers I've heard at or anywhere near their price. The speaker's versatility for use as a center channel and/or surround -- as well as its ability to be placed on the wall, desktop, or floor -- make it a superb value. If you are looking for a great pair of low-profile speakers to match with your flat-panel TV, you owe it to yourself to take the SLM-XLs for a spin and see if they're right for you."

—Myron Ho, Home Theater Review
Read the full review»



Specifications are subject to change without notice

Frequency Response

100–25,000 Hz ±3dB

Recommended Amplifier Power

20—140 watts per channel

Horizontal Dispersion


Vertical Dispersion



94 dB/2.83 volts/meter


4 Ohms Compatible with 4, 6, or 8 Ohm rated amplifiers.

Crossover Frequency

3,100 Hz

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 Transducer

Two 4” (10.2cm) paper cone. Four 4” (10.2cm) paper cone passive radiators.


Custom air core coil inductors. Polyester film capacitors in series and low DF electrolytic capacitors in parallel. Overall system thermal/current protection.


Low-profile push style


9 lbs. (4.1 kg)


34.1" x 6.4" x 1.89 "
(86.7cm x 16.2cm x 4.8cm)

Customer Reviews For Motion SLM XL

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  • Wednesday, July 11, 2018

I purchased three of the Motion SLM speakers several months ago (FR/FL/FC). They have been nothing but great, especially matched with a recently discounted Dynamo 1000W subwoofer. The value of the SLM speakers is incredible for the sound. And then there's the aesthetics. I would not say they are overpriced at all. I like them so much I just purchased three of the Motion SLM XL speakers to replace the front sound stage. The smaller SLM speakers will be relocated to the rear sound stage (RR/RL). I picked up a second, identical sub at an even further discounted floor model price at the same time. My one complaint is the stand for the side configuration (i.e. center channel). Some personal matters delayed the wall-mounting of the original SLM speakers I purchased, and the center channel was set up on the mantle over the fireplace beneath the TV. The speaker wire is run in the wall behind the TV, and the center channel speaker has been sitting on the mantle for months (since Feb 2018). A few days ago I came home to my center channel laying on my concrete floor having fallen and smashed into the stone hearth with no earthly idea what happened other than gravity. I guess I had the stand feet set so the speaker was too vertical? It was heart-breaking to say the least. Make no mistake, I will not be setting up the XL speakers until I am ready to wall mount them.


  • Thursday, October 23, 2014

All ML
In my other review I talked about migrating and upgrading my components to Martin Logan. First it was my sub, then my center, then my rears. I still had some pretty good tower speakers from college that I was using up front which my cats were using as scratching posts. My tv is on an arm that puts it to the front of a cutout from the mantel. My center sat on one shelf and on the bottom of the cutout my receiver, and other a/v components sat. Everything looked clean, except for the two towers. I have been eyeing the XL SLM's since they came out, but was hesitant because my livingroom is open and has a 2nd story ceiling. After debate, last week I finally pulled the trigger and decided to also swap out my Motion 6 for a 3rd SLM XL. Tuesday they arrived and within minutes I was unpacking and within an hour the 2 fronts were hung on the mantel, I concealed the holes for wiring behind the speaker just under the bracket and the holes perpendicular just under the shelf. The center just took seconds to get the stand put on. I can honestly say they sound better than my towers. Sure they were ~15 yrs old but they were a great speakers when I bought them. With all of my speakers having folded motion tweeters, the highs really fill the room. Having the matched center I think makes things sound a little cleaner. My dynamo 700w is enough to take up the slack for the smaller drivers. The system is truly up to what I wanted it to be, great sounding and great looking. Sure I could have gone with some Motion 20 or 40's and had a better low end, but I believe the clean look, and not taking up any floor space is a pretty good trade-off.


  • Monday, March 3, 2014

I purchased front left and right speakers SLMXL, and the center channel SLM. And both rear surrounds are the FX2. And I have a quality sub. The Martin Logan speakers are clean and sound great loud. The louder you push them, the better they sound. Truly in this case, louder Is better. My better half is a professional vocalist. And that being said, it put a huge smile on her face when I debuted my newly remodeled man-cave, and the Martin Logan speakers. Movies and video games come alive too. Since I was short on space converting a former small bed room to a full time media room, my best choice were wall mounted speakers. I have zero regrets with my choice. I researched speakers for a couple of months. I never found these speakers on display for listening so I was very wary. First because these speakers are not the most affordable, and secondly I am not easily impressed. I said bye bye to my BOSE and hello Motion ! These speakers are truly like going from fast food, to a 5 star restaurant. Once you have experienced it, you realize "You get what you pay for".