MartinLogan Motion® 4

Bookshelf speaker with wall mount bracket

Item #: 839MO4GB

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MartinLogan Motion 4 in living room

Elegant looks, effortless detail

MartinLogan's Motion series speakers are known for sound that's realistic and immediate without being overbearing or harsh. The Motion 4 bookshelf speaker provides smooth, musical highs, clear mids, and surprisingly rich bass in a compact, elegant-looking package. Equipped with an included wall-mount bracket, this speaker works great in a wide range of applications. Use a pair for stereo music in rooms where you don't want to sacrifice floor space. Or use four of these satellites for your front and rear channels in a high-performance surround sound system.

Folded Motion™ tweeter for detailed sound

MartinLogan Motion 2 tweeter detail

The Motion 4 uses MartinLogan's acclaimed Folded Motion tweeter for smooth, effortless highs.

The distinctive sound of the Motion series starts with MartinLogan's Folded Motion tweeter. Rather than a dome or cone driver, this tweeter uses a pleated diaphragm that works like an accordion by "squeezing" air to create sound. It requires about 90% less excursion than a typical 1" dome tweeter, resulting in quicker response time and much lower distortion. The tweeter's controlled sound dispersion creates a focused soundstage with a real sense of presence. Music sounds amazingly detailed, but smooth and effortless, without a trace of harshness.

A stylish, curved cabinet with a unique folded port

MartinLogan Motion 4 internal view

Cutaway view of the folded bass port

The tweeter is coupled here with a 4" doped paper cone woofer that supplies accurate mids and lows. The Motion 4's  eye-catching curved cabinet is finished in classic high-gloss piano black, and it hides a unique folded bass port that helps reinforce the low frequencies and improve sensitivity. This speaker's subtle, modern lines complement just about any décor. If you're mounting it high up on your wall, you can invert it to aim the high frequencies downward toward your listening position.

Be sure you get enough bass

For even better bass — and especially for high-impact home theater — we recommend a powered subwoofer, like one of MartinLogan's excellent models.

Product Highlights:

  • elegantly curved cabinet with high-gloss piano black finish
  • 1" x 1.4" Folded Motion tweeter
  • 4" paper cone woofer with rigid dust cap
  • frequency response 70-25,000 Hz (±3dB)
  • handles up to 150 watts
  • sensitivity: 90 dB
  • impedance: 4 ohms
  • bass reflex cabinet with folded port for improved low-frequency extension
  • perforated metal grille
  • custom-designed push-style binding posts accept pins, banana connectors, or bare wire
  • includes wall mount bracket
  • 5-5/8"W x 12-5/8"H x 5-1/4"D
  • weight: 6 lbs.
  • warranty: 5 years (with product registration)
  • Our 60-day money-back guarantee

Why choose bookshelf speakers?

Bookshelf speakers may be small in size, but they can deliver surprisingly big sound. Some ultra-compact models even fit on a desktop. Most are right at home in tight spaces like shelves, so they're usually good choices for your home theater's rear channels. For the best performance, try placing bookshelf speakers on solid speaker stands to help the sound really "open up." If you want full bass impact, add a powered subwoofer and enjoy punchy sound that's as deeply satisfying as that of floor-standing speakers.

Hands-on research

What's in the box?

Download owner's manual

  • Bookshelf loudspeaker
  • MartingLogan logo badge (installed)
  • Wall-bracket
  • Wall-bracket spacer
  • Two 1.5" screws
  • 2 Drywall anchors
  • 1/4"-20 Shoulder bolt
  • 4 Self-adhesive rubber pads
  • Cleaning cloth
  • User's Manual (En/Fr)
  • Installation template
  • Product Registration Card

Product Research

Features

Folded Motion Tweeter: MartinLogan's Folded Motion Tweeter helps give the Motion 4 bookshelf loudspeaker its natural, realistic high frequency sound. Lightning fast transient response, combined with a large surface area (8x that of a typical 1" dome tweeter) creates clear, dynamic, and precise sound. The 1" x 1.4" Folded Motion Tweeter works by moving air (which creates sound) perpendicular to the folded ridges of the diaphragm, similar to how an accordion works. This extremely low mass diaphragm "squeezes" air and requires almost 90% less excursion than the typical 1" dome tweeter, which drastically minimizes distortion while providing a lightning fast response time. The increased surface area also provides a wide, yet controlled sound dispersion to create a realistic and carefully etched sound stage.

4" Paper Cone Woofer: The MartinLogan Motion 4 loudspeaker features a 4" paper cone woofer with a stamped steel basket housed in a non-resonant asymmetrical chamber. The paper cone woofer uses a rigid structured dust cap to reduce cone break-up and distortion. This 4" cone woofer provides rich, detailed midbass.

Precision Crossover: To seamlessly blend the audio output from the high frequency driver (tweeter) and the midbass driver (woofer), the Motion 4 loudspeaker features a precision 2900Hz crossover utilizing custom air core coil and low DCR steel laminate inductors, polyester film capacitors in series, and low DF electrolytic capacitors in parallel.

Folded Reflex Port Technology: MartinLogan engineers were faced with a daunting task, create a compact speaker with low-end bass reproduction found in speakers much larger. After a myriad of prototypes, they created the Folded Motion Cascading Bass Port. This brilliant solution allows a long tuned port, which is folded over itself (think of a trombone's tuning arm) to be compacted and squeezed into the Motion 4 bookshelf loudspeaker. The result is amazingly detailed low bass that can play at high volumes with minimum distortion; all thanks to the elegantly simple cascading fold that slows down and controls the air motion of the bass waves. The Folded Motion Cascading Bass Port exits the rear-panel of the speaker cabinet.

Curved High-Gloss Black Cabinet: Complementing the Motion 4 loudspeaker's sonic accuracy is its elegant, yet understated styling. A high-gloss, piano black finish and subtle curves, along with MartinLogan's signature perforated grille, give the Motion 4 speaker an elegant and timeless look that will blend into almost any decor.

Spring-Post Connectors: The MartinLogan Motion 4 speaker features two spring-post connectors to attach your speaker wire. The spring-posts will accept bare wire (16- to 10-gauge), pin-connectors, and banana plugs (single only). The rubber caps on the spring-post connectors must be removed to use banana plugs.

Versatile Mounting Options: The MartinLogan Motion 4 bookshelf loudspeaker can simply be placed on a table-top, stand, shelf, or other flat surface. Four self-adhesive rubber feet are included for safe and secure placement. Using the included keyhole-slot bracket, you can wall-mount the speaker at two different angles. This means you can point sound directly toward the desired listening area for high or low wall mounting applications. In addition the Motion 4 is fitted with a 1/4"-20 threaded insert which allows you to hang the speaker on the wall using optional articulating wall-mount brackets (sold separately).

  • If the Motion 4 is being mounted at approximately ear-level, the speaker should be oriented with the tweeter at the top. This will disperse sound directly towards the desired listening area.
  • If the Motion 4 is be mounted above ear-level, the speaker should be oriented with the tweeter at the bottom. This will disperse the sound down at a 20° angle towards the listening area.
Note: The MartinLogan logo badge on the Motion 4's grille can be re-position based on how you have the speaker mounted.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

MartinLogan Motion® 4 Reviews

Average Customer Review:

3 reviews
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Great Buy!

Written By Jim, Great Bend, KS on Monday, September 08, 2014

Crutchfield Customer Review (What's this?)

Perfect size, excellent sound. Will buy 2 more for another room.

Pros: Smaller size and great sound quality, clear.

Cons: None

Concert in the family room

Written By CalvinG, Delray Beach, Fl on Friday, April 18, 2014

Crutchfield Customer Review (What's this?)

Crystal clear, the tweeters are awesome. They are a great addition. I'm use them as my surround high speakers. Perfectly matched with my Motion 8 center , ESL fronts and dynamo 700W.

Pros: The tweeters, the tweeters, I think I already said that.

Oskar Heil, you were amazing

Written By KentS, San Antonio, TX on Friday, December 20, 2013

Crutchfield Customer Review (What's this?)

These Martin Logan speakers rock! Using them in a 5.1 AV system. I am and have been a fan of this style tweeter since Oskar Heil invented the Air Motion Transformer in the early seventies. If you love crisp, clean high frequencies in your music, this is the speaker for you. Only issue is the lack of bass response and that is easily remedied with a quality subwoofer.

Pros: Crisp, clean highs. Compact size Quality of materials used.

Cons: Lack of bass response

Get everything you’ll need to enjoy your new MartinLogan Motion® 4

You'll need speaker wire to connect your speakers to your amp or receiver. No wire is included with this speaker.
Cut your speaker wire to the exact length you need.
Add connectors to your bulk speaker wire for a neater, easier, and more reliable installation.
Get floor stands to keep your speakers attractively and safely at the right level.
A powered sub delivers high-energy bass to bring your music and movie soundtracks to life.
The center channel reproduces most movie dialogue and more than 50% of the soundtrack information. You'll want a speaker that is voice-matched to your main speakers.
Complete your home theater speaker system with voice-matched surround speakers.
Bookshelf speakers make great surround speakers. Finish off your system with a pair of voice-matched speakers for the rear of your home theater.
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