MartinLogan Motion® 40

Floor-standing speaker (Black Cherrywood)

Item #: 839MO40BC

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7 Reviews

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These speakers will get your attention for the all the right reasons

MartinLogan may be known for their innovative electrostatic speakers. But they know a few things about more conventional designs, too. Their Motion 40 speaker is proof, offering sublime high-end detail, smooth midrange accuracy, and deep bass extension. These beautiful speakers offer wide-open sound that seems to breathe with clarity and depth. The Motion series caught our attention when MartinLogan played them for us at a recent demonstration. We're anxious to hear more from the Motion 40. A lot more.

Detail and precision from the Folded Motion™ tweeter

Perched above the Motion 40's midrange woofer is the source of this speaker's impressive high-frequency performance — MartinLogan's innovative Folded Motion tweeter. Its pleated diaphragm works similarly to an accordion by "squeezing" air to create sound. Because it requires almost 90% less excursion than the typical 1" dome tweeter, response time is drastically reduced along with distortion. The diaphragm's increased surface area also provides wide, yet controlled sound dispersion to create a realistic and highly accurate soundstage.

MartinLogan Motion 40 floorstanding speakers

The Motion 40 speakers excel at delivering airy high-end detail.

A solid mid- and low-frequency foundation

Glorious high-end transparency is just part of the Motion 40's story. A 5-1/2" woofer keeps those crucial midrange frequencies warm and neutral, so vocals sound almost as if the singer were in the room. What about the bass? Two 6-1/2" woofers ensure the Motion 40 goes plenty low. These oversized drivers increase low-frequency output, making sure bass response isn't an afterthought or left for a subwoofer to worry about. The rear-firing bass port helps efficiently enhance bass response without adding distortion to this speaker's clean performance.

All that and looks too

MartinLogan knows how to catch ears and eyes. The Motion 40 comes in your choice of Gloss Black or Black Cherrywood finishes. The cabinet features an angled top and soft corners, making it stand out from the typical box-shaped tower speaker. Removable spiked feet offer stability while preserving this speaker's natural sound.

Product Highlights:

  • Folded Motion™ tweeter for high output levels and low distortion
  • one 5-1/2" aluminum cone midrange woofer
  • two 6-1/2" aluminum cone low-frequency woofers
  • bass-reflex (ported) cabinet
  • rear-firing bass port for enhanced low-frequency response
  • high-performance Vojtko™ crossover network with custom air core coil, low DCR steel laminate inductors, polyester film capacitors, and low DF electrolytic capacitors
  • frequency response: 40-25,000 Hz (±3dB)
  • sensitivity: 92 dB
  • impedance: 4 ohms
  • recommended amplifier power: 20-300 watts
  • perforated magnetic grille
  • Gloss Black finish
  • includes removable floor spikes
  • five-way binding post speaker terminals (bi-amp/bi-wire capable)
  • 7-9/16"W x 41-1/2"H x 12-3/4"D
  • weight: 49 lbs.
  • warranty: 5 years (with product registration)
  • Our 60-day money-back guarantee

Floor-standing speakers — still standing tall

Sure, floor-standing tower speakers buck the industry trend toward smaller, visually inconspicuous speakers, but they're hard to beat if great sound is your primary goal. Tower speakers produce powerful sound with excellent bass, making them a great choice for serious music lovers and for folks who want high-impact home theater.

MartinLogan Motion® 40 Reviews

Average Customer Review:

7 reviews
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Motion 40s

Written By Dominick T, Pennsylvania on Saturday, October 24, 2015

Crutchfield Customer Review (What's this?)

Beautiful speakers and great sound. Still in break-in period.

Pros: Finish and construction, sound.

Cons: none so far

MartinLogan Motion 40

Written By Randy, Fort Worth, TX on Sunday, August 31, 2014

Crutchfield Customer Review (What's this?)

I bought these speakers to upgrade from Infinity Primus. While the Primus were a good value for the price, the Motion 40's are a definite step up. They really perform well when cranking up the volume compared to the Primus. Nice low end, really do not feel the need to have subwoofer when playing music. I like the bright and detailed sound from the tweeters. They look really nice with smaller foot print (wife friendly). I looked at the ESLs but did not appreciate enough improvement in sound for the price. I looked at the B&W CMs but liked the sound and look of the 40's better as well as the lower price tag. Wife was initially leery of the price but ended up really liking them too.

Pros: Sound great, look great

Cons: none

Very Pleased

Written By Lymbo90, Asheville, NC on Tuesday, April 08, 2014

Crutchfield Customer Review (What's this?)

Stepped up from B&W bookshelf speakers and I've been extremely pleased with the Motion40's. The sound quality is dynamic and they look very nice as well. These are without a doubt the best speakers I've ever owned.

Pros: Nice, wide and detailed sound field. Best tweeters I've ever heard.

Cons: They make me want to stay in my music room too much.

Martin Logan Motion 40

Written By td465c, Everett WA on Sunday, February 09, 2014

Crutchfield Customer Review (What's this?)

The appearance and sound quality of these speakers is outstanding.

Pros: Excellent appearance, Excellent sound.

Cons: 72 hr. @ 92 db break in period. However, It's a requirement one can live with

Solid and nice looking

Written By Anonymous, Portland, or on Thursday, September 05, 2013

Crutchfield Customer Review (What's this?)

Very nice sounding and looking speakers

Really good, but buy the ESL's

Written By Jarcon, Texas on Saturday, August 24, 2013

I'm giving these a 5 because they honestly sound really good. I originally bought the instead of the ESL's because I heard the ESL's are finicky. While the motion 40 are really good, and I would recommend them to anyone considering a traditional speaker at this price, I now recommend the ESL's.

Pros: Great sound.

Cons: None, but they have a better bigger brother

Amazing speakers

Written By Jim, Stanardsville, VA on Tuesday, August 13, 2013

I have never heard speakers that sound this good. Words cannot describe how realistic they sound. I feel like I'm in the recording booth with the artists. I believe I still have a ways to go until the are completely broken in. Well worth the money.

Pros: The most amazing speakers I have ever owned.

Cons: None

Hands-on research

What's in the box?

Download owner's manual

  • Floor-standing loudspeaker
  • Magnetic grille
  • 4 Spiked feet
  • User's Manual (En/Fr)
  • Product Registration Card

Features and Specs

Enclosure Bass Reflex
Finish Wood veneer
Color Black Cherrywood
Tweeter Folded Motion Transducer
Tweeter Size (inches) 1x1.4
Midrange Size (inches) 5.5
Woofer Size (inches) 6.5
Woofer Composition Aluminum
Woofer Surround Rubber
Built-in Powered Sub No
Video-Shielded No
Connector Type Binding post
Bi-amp Inputs Yes
Parts Warranty 5 Yrs w/ Registration
Labor Warranty 5 Yrs w/ Registration
Power Range 20-300
Frequency Response 40-25k Hz
Sensitivity 92 dB
Impedance (Ohms) 4
Amplifier Power ---
Height (inches) 41-1/2
Width (inches) 7-9/16
Depth (inches) 12-3/4
Weight 49 lbs

Product Research


3-Way Tower Loudspeaker: The MartinLogan Motion 40 tower loudspeaker employs a 3-way speaker design and features MartinLogan's advanced resolution Folded Motion Tweeter, a 5.5" aluminum cone midrange driver, and two 6.5" aluminum cone bass woofers. Pairing these trio of woofers together with the Folded Motion Tweeter creates a dynamic full-range sound with an expansive soundstage.

  • Folded Motion Tweeter: MartinLogan's Folded Motion Tweeter helps give the Motion 40 tower 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 (80°x80°) to create a realistic and carefully etched sound stage.
  • 5.5" Midrange Driver: The MartinLogan Motion 40 loudspeaker features a 5.5" aluminum cone midrange driver housed in a non-resonant asymmetrical chamber. The aluminum cone driver uses a rigid structured dust cap to reduce cone break-up and distortion. This 5.5" midrange driver promotes an even more open, revealing, and authentic sound in the critical midrange/midbass.
  • Two Aluminum 6.5" Woofers w/ Rear-Firing Bass Port: The MartinLogan Motion 40 also features dual 6.5" aluminum cone bass woofers housed in a non-resonant asymmetrical chamber with a rear-firing port. The aluminum cone woofers use a rigid structured dust cap to reduce cone break-up and distortion. The two 6.5" woofers paired with the rear-firing bass port create increased cone area delivering higher output and audibly richer, deeper bass performance.

Precision Vojtko Crossovers: To seamlessly blend the audio output from the Folded Motion Tweeter, 5.5" midrange driver, and dual 6.5" bass woofers, the Motion 40 tower speaker features two precision Vojtko crossovers (500/2,600Hz) utilizing custom air core coil and low DCR steel laminate inductors, polyester film capacitors in series, and low DF electrolytic capacitors in parallel.

Bi-Wirable Binding Post: The MartinLogan Motion 40 features bi-wirable binding posts and provide the ultimate level of flexibility for connection and setup. MartinLogan's proprietary tool-less binding posts simplify cable connection and management. Two sets are supplied; one connected to the tweeter and midrange, while the other is connected to the dual woofers. You can choose to bi-wire/bi-amp the Motion 40 loudspeaker, or use jumper clips between the binding post sets for a single wire-connection. The binding posts will accept bare wire (16- to 8-gauge), pin-connectors, spade-connectors, and banana plugs (single only).

High-Gloss Cabinet: Complementing the Motion 40 loudspeaker's sonic accuracy is its elegant, yet understated styling. A high-gloss, piano black or black cherrywood finish, along with MartinLogan's signature perforated grille, give the Motion 40 speaker an elegant and timeless look that will blend into almost any decor.

Interchangeable Feet: The MartinLogan Motion 40 tower loudspeaker includes four pre-installed rubber feet for tile and hardwood floors. You can replace the pre-installed rubber feet with four metal spiked feet for carpeted flooring. Both the rubber and spiked feet are threaded so they can be adjusted to non-level floors. The spiked feed add approximately 0.875" to the height of the speaker.

Placement: Although the speakers are designed to deliver a superb sonic performance when placed close to a wall, you may notice improved imaging and detail if you are able to place the speakers (measured from the tweeter and woofers) 2' to 3' from the front wall and 2' or more from the side walls. To achieve optimum stereo imaging it is recommend that you aim the speakers toward your primary listening position.

Break-in Period: Allow approximately 72 hours of break-in at 90 dB (moderate listening levels) before any critical listening.

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 verify what’s in the box, 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.

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MartinLogan Motion 60XT BC

Get deeper bass and more room-filling sound

The MartinLogan Motion® 60XT offers these features:

dual 8" woofers for deeper, more powerful bass

MartinLogan's best Folded Motion XT tweeter for more expansive highs

35-25,000 Hz frequency response