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MartinLogan ElectroMotion® R

In-ceiling speaker

Item # 839EMR

California customers:
Please click here for your Proposition 65 warning.

Discontinued item
2 questions - 4 answers

Item # 839EMR

Other options

About the MartinLogan ElectroMotion® R

Remarkable sound without the clutter

The ElectroMotion R proves that a speaker can deliver outstanding sound, without standing out in the room. MartinLogan's potent in-ceiling speaker provides powerful performance for all your music and home theater needs, while vanishing neatly into your room's decor. Install a pair of these speakers in a kitchen or bedroom for fantastic stereo sound, or use multiple pairs to create a concealed surround sound system in your living room.

MartinLogan EM R in-ceiling speaker

Folded Motion™ tweeter for open, detailed sound

The distinctive sound of the ElectroMotion R 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 and movie soundtracks sound amazingly detailed, but smooth and effortless, without a trace of harshness.

Bass that keeps pace

The speaker's deep, responsive bass and dynamic midrange come courtesy of an 8" aluminum cone woofer. Mounted in a rigid, cast-aluminum basket to minimize unwanted resonance, the woofer supplies fast, clean sound that blends seamlessly with the Folded Motion tweeter. A hand-built, audiophile-grade crossover further ensures precise driver integration for high-accuracy sound.

Installer-friendy design

The ElectroMotion R's robust mounting-lock system allows quick, trouble-free installation, providing firm coupling of the speaker's chassis to the ceiling. And this speaker is practically invisible thanks to an ultra-low profile, micro-perforated grille and hidden bezel. Magnets hold the grille in place, reducing the risk of warping or damage during installation. The Folded Motion tweeter is mounted at an angle, allowing the entire speaker to rotate to aim sound precisely where you want it.

Got wire?

Most speakers don't include any. Learn more about in-wall wiring.
Shop our selection of in-wall speaker wire.

Product highlights:

  • 1" x 1.4" Folded Motion tweeter for exceptional detail with low distortion
  • 8" aluminum cone woofer with cast aluminum basket
  • frequency response: 37-25,000 Hz (±3dB)
  • recommended amplifier power: 20-300 watts
  • sensitivity: 92 dB
  • impedance: 4 ohms
  • hand-built, audiophile-grade crossover network
  • angled rotating design to aim sound
  • paintable speaker grille
  • frame dimensions: 11-1/2 diameter
  • cutout dimensions: 10-1/2" diameter
  • mounting depth: 5-15/16"
  • warranty: 5 years (with product registration)
  • Our 60-day money-back guarantee
  • MFR # EMR

What's in the box:

  • In-ceiling speaker
  • Grille
  • Paint cover
  • User's Manual (En/Fr)
  • Installation template
  • Product Registration Card

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More details on the MartinLogan ElectroMotion® R

Stacey B.

Features & specs

Quantity in Package Single
Tweeter Folded Motion Ribbon
Aimable Tweeter No
Woofer Composition Aluminum
Woofer Surround Rubber
Moisture-resistant No
Connector Type Spring post
Bi-Amp Inputs No
Built-in Back-box No
Tweeter Size 1 x 1.4
Midrange Size N/A
Speaker Shape Round
Woofer Size 8
Cutout Width 10.5
Cutout Height 10.5
Power Range (Watts) 20-300
Sensitivity 92 dB
Impedance (Ohms) 4
Frequency Response 37-25kHz
Parts Warranty 5 Yrs w/ Registration
Labor Warranty 5 Yrs w/ Registration

Product Research


In-Ceiling Loudspeaker: The ElectroMotion R in-ceiling loudspeaker features MartinLogan's Folded Motion tweeter and a 8" aluminum cone woofer with cast aluminum basket that provides powerful low-frequency bass extension. This stealthy in-ceiling speaker blends seamlessly into any home thanks to it's ultra-low profile, micro-perforated grille with no visible bezel.

Angled Folded Motion Tweeter: MartinLogan's Folded Motion tweeter helps give the ElectroMotion IW in-ceiling speaker 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. The Folded Motion tweeter is mounted at an angle, allowing the entire speaker to rotate to aim sound precisely where you want it.

Aluminum Cone Woofer: The ElectroMotion R in-ceiling speaker employs a 8" aluminum cone woofer with a rubber surround, concave dust cap, and cast aluminum basket for detailed midrange and powerful low-frequency bass extension.

Precision Vojtko Crossover: Carefully hand-built using only the finest polyester capacitors and air-core coils, the crossover employ's MartinLogan's proprietary Vojtko topology for vanishingly low distortion and seamless driver integration. This precision-tuned network preserves even the most microscopic sonic nuances while handling the full dynamics of any source.

Spring-Post Connectors: The MartinLogan ElectroMotion R features two spring-post connectors to attach your speaker wire. The spring-posts will accept bare wire (16- to 12-gauge) and pin-connectors.

Robust Mounting Locks: A robust mounting-lock system allows quick, trouble-free installation. When not in use, the constant-control mounting locks are held securely within a self-contained housing. When moved into place during installation, they couple the speaker's chassis firmly to the ceiling. And if the speaker is ever removed, the locks retract and latch themselves back in their housings.

Ultra-Low Profile Grille: The MartinLogan EM-R features an ultra-low profile, paintable micro-perforated grille with no visible bezel for a near invisible integration into any ceiling. A magnetic system secures the grille easily into place, reducing the risk of warping or damage during installation.

Applications & Placement: The EM-R is suitable for almost any application in average to small rooms. Ideal for use in a multi-channel home theater as a surround speaker, in a kitchen as 2-channel stereo speaker, or in a hallway as part of a distributed audio system. This MartinLogan in-ceiling speaker offers superb imaging and flexible placement in nearly any location. However, for best performance and imaging place speakers equidistant from one another and avoid physical obstructions between the speaker and primary listening position.

Installation Dimensions: The in-ceiling speaker has an overall measurement of 11.5" in diameter x 6.0" deep. It requires a cut-out of 10.5" in diameter and a mounting depth of 5.9375" behind the ceiling surface. The speaker only protrudes 0.125" from the ceiling.

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

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Customer Q&A

2 questions already asked

Does Crutchfield .. or anyone .... sell a decent power amplifier for under $1200 that is recommended to fully use these speakers (which seem to be rated for up to 300 watts per channel)? The intended usage is a music/dance/club room at my house. Thank you.
[ Mike  May 22, 2017 ]
2 answers
These are very efficient speakers so you really don't need much power to drive them. I'm using a slimline Marantz 1608 and they get very loud. I'd add a powered subwoofer as this will take a lot of the high power demands off of the receiver and main speakers.
[ James  May 18, 2019 ]
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.
[ Kenny  May 23, 2017 ]  Staff
Will this work for front left and right channels on a 5.1 system?
[ itsjose  Feb 23, 2017 ]
2 answers
Not really would suggest their inwall speakers vs ceiling for front speakers
[ KEVIN  Feb 25, 2017 ]
Yes, very well for left, center, and right channels. The ability to aim the tweeter housing is outstanding.
[ E  Feb 24, 2017 ]

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Experience audiophile-quality in-ceiling sound

The MartinLogan Vanquish offers these features:
  • MartinLogan's larger Folded Motion XT tweeter for increased bandwidth and efficiency
  • dual 3-1/2" drivers to deliver clear, articulate midrange sound
  • a solid die-cast aluminum housing that resists vibration and warping