MartinLogan Motion SLM 4″ Flat-Panel Speaker


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SKU: Motion SLM


The slender Motion® SLM speakers features 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

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.

Grille Options

Both Motion SLM & SLM XL have optional paintable metal
grille covers (sold separately) that can blend into your room for a stealthy

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.


Specifications are subject to change without notice

Frequency Response

110–25,000 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

2,600 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. Two 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/cur- rent protection.


Low-profile push style


6.5 lbs. (3 kg)


25.3″ x 6.4″ x 1.83 “

(64.2cm x 16.2cm x 4.75cm)

Additional information

Weight 0.00000000 lbs


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