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MartinLogan ElectroMotion® ESL C

Center channel speaker (Satin Black)

Item # 839ESLCB

Building a high-end home theater system around a pair of MartinLogan  ElectroMotion tower speakers ?...

Building a high-end home theater system around a pair of MartinLogan  ElectroMotion tower speakers ?...

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Item # 839ESLCB

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$1,699.99 each

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About the MartinLogan ElectroMotion® ESL C

The perfect match for your ElectroMotion® towers

Building a high-end home theater system around a pair of MartinLogan ElectroMotion tower speakers? Treat yourself to incredible voice-matched performance with the ElectroMotion ESL C. This electrostatic center channel helps you create a powerful front soundstage that delivers natural, detailed sound with TV shows and movie soundtracks.

The perfect match for your ElectroMotion® towers

Building a high-end home theater system around a pair of MartinLogan ElectroMotion tower speakers? Treat yourself to incredible voice-matched performance with the ElectroMotion ESL C. This electrostatic center channel helps you create a powerful front soundstage that delivers natural, detailed sound with TV shows and movie soundtracks.

MartinLogan ElectroMotion® ESL C Center channel speaker

The ElectroMotion ESL C's CenterForce bass system uses two 5-1/4" high-excursion woofers for terrific low-note bass performance.

Exquisite design and performance

There's a lot going on under the ESL C's hood. This speaker also uses a unique CenterForce™ bass system, which leverages two opposite-facing 5-1/4" high-excursion woofers to provide low-frequency punch. 

The woofers combine with two electrostatic midrange drivers (DC power supply included), and MartinLogan's famed Folded Motion™ tweeter to deliver nuanced dialogue and exciting center stage sound effects.

Compact yet mighty

The ESL C is packed with high-performance features, but its sleek cabinet still checks in at under eight inches tall — an impressive bit of engineering from MartinLogan. That means it can fit inside many entertainment cabinets instead of requiring a separate stand or shelf. 


Product highlights:

  • high-performance 3-way electrostatic center channel speaker
  • designed for use with MartinLogan ElectroMotion ESL or ElectroMotion ESL X electrostatic floor-standing speakers
  • high-frequency driver:
    • 1" x 1-7/16" Folded Motion™ tweeter with 5-1/4" x 1-3/4" diaphragm
  • mid-frequency drivers:
    • two 9" x 6-3/8" transducers housed in a 23" x 6-3/8" CLS™ (Curvilinear Line Source) XStat™ electrostatic panel
  • low-frequency drivers:
    • CenterForce™ bass system with two 5-1/4" high-excursion, high-rigidity aluminum woofers with extended throw driver assemblies
  • high-performance crossover network with air core coils, polyester capacitors, and a custom-wound audio transformer
  • external low-voltage DC power supply (included) requires AC outlet connection to energize electrostatic panel
  • frequency response: 66-23,000 Hz (±3dB)
  • sensitivity: 89 dB
  • impedance: 4 ohms
  • recommended amplifier power: 20-300 watts
  • black satin finish
  • spring post speaker terminals accept bare wires, pins, and banana connectors
  • 23"W x 7-5/8"H x 16-1/8"D
  • weight: 32 lbs.
  • warranty: 5 years (with product registration)
  • Our 60-day money-back guarantee
  • MFR # ESL-C Satin Blk

What's in the box:

  • Center-channel loudspeaker
  • Grille
  • AC power supply (attached 10' DC cord)
  • User's Manual (En/Fr)
  • Product Registration Card

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More details on the MartinLogan ElectroMotion® ESL C

Stacey B.

Features & specs

Enclosure Passive Radiator
Color Black
Tweeter Type Folded Motion Ribbon
Tweeter Size (inches) 1 x 1.4
Midrange size (inches) 9 x 6.375
Woofer size (inches) 5-1/4
Connector Type Binding post
Power Range 20-300
Sensitivity 89 dB
Impedance (Ohms) 4
Frequency Response 66-23k Hz
Height (inches) 7-5/8
Width (inches) 22-7/8
Depth (inches) 16-1/8
Weight 32 lbs
Wall-mountable No
Bracket Included No
Parts Warranty 5 Yrs w/ Registration
Labor Warranty 5 Yrs w/ Registration

Product Research


Electrostatic Center-Channel Loudspeaker: The MarintLogan EM-ESL C is a high-performance electrostatic center-channel loudspeaker delivers a full-range performance, by combining an electrostatic panel with a Folded Motion Tweeter, bolstered by a CenterForce bass system.  With the exceptional mid-range dynamics of an electrostatic panel, the remarkable details delivered by a Folded Motion Tweeter, and the addition of a newly-designed CenterForce dual woofer system, you can match the acoustic signature of MartinLogan's ElectroMotion Series of speakers to build a truly astounding home theater system.

Electrostaic Midrange Panel: By adding a compact electrostatic panel to a center channel speaker, MartinLogan engineers have succeeded in expanding the performance dynamics of the most important speaker in your home theater system. Your center channel speaker needs to be able to reproduce the finest high frequency details with an expansive midrange to reproduce every whisper of dialog. The EM-ESL C has a shallow height CLS (Curvilinear Line Source) XStat electrostatic panel wrapped around the front of the speaker enclosure. The gentle horizontal curve of the panel enhances the output of its deceptively compact 114-square-inch radiating area, extending mid-range dispersion patterns and blending the performance seamlessly with your front-stage ElectroMotion loudspeakers.

Folded Motion Tweeter: Just behind the electrostatic panel, in a specially designed housing, sits MartinLogan's exclusive Folded Motion Tweeter. The low-mass diaphragm of the Folded Motion Tweeter minimizes distortion, and its short excursion length reinforces its lightning fast high frequency response. The 1 x 1.4-inch Folded Motion Tweeter in the EM-ESL C has a total diaphragm area of 9.2-inches, with the ability to reproduce precise details; one of the most important jobs of a center channel speaker.

CenterForce Duall Woofer System: Instead of taking up space by positioning the woofers on each side of the electrostatic panel, MartinLogan designed a central slot inside the cabinet for the woofers. So, the dual woofers reside in a well-braced enclosure located behind the tweeter and electrostatic panel.This new CenterForce design allows the speaker to be more compact, and encourages the woofers to produce a generous amount of well-blended deep bass. The CenterForce system in the EM-ESL C features two custom-designed 5.25-inch aluminum cone woofers. Rigid and yet lightweight, this material reduces flexure while minimizing response time. Their efficient construction optimizes suspension and magnetic flux field, further reducing potential sources of distortion. The result is accurate, musical bass response.

Binding Post Speaker Terminals: The MarintLogan EM-ESL C features gold-plated binding posts that will accept bare wire (16- to 8-gauge), pin-connectors, spade-connectors, and banana plugs (single only).

Low-Voltage DC Power Supply: The ElectroMotion ESL C speaker uses an external low-voltage power supply to energize its electrostatic panel. The included power supply firmly inserts into the "DC Power In" receptacle on the rear-panel of the speaker and then to an AC wall outlet. The ElectroMotion ESL C speaker features a signal sensing circuit which will switch the ElectroMotion ESL C off after a few minutes of no music signal, and requires less than two seconds to recharge the panels when a music signal is present.

  • Input: AC 100-240V~50/60Hz, 0.2A
  • Output: DC 15V, 0.4A

Electrostatic Technology (How it Works): Where traditional loudspeaker technology incorporate cones, domes, diaphragms, and ribbons that are moved with magnetism, electrostatic loudspeakers employ charged electrons attracting and repelling each other. An electrostatic transducer consists of three pieces; stators, the diaphragm, and spacers. The diaphragm is what actually moves to excite the air and create music. The stator's job is to remain stationary and to provide a reference point for the moving diaphragm. The spacers provide the diaphragm with a fixed distance in which to move between the stators. As your amplifier sends music signals to an electrostatic speaker, these signals are changed into two high-voltage signals that are equal in strength but opposite in polarity. These high voltage signals are then applied to the stators. The resulting electrostatic field, created by the opposing high voltage on the stators, works simultaneously with and against the diaphragm, consequently moving it back and forth, producing music. This technique is known as push-pull operation and is a major contributor to the sonic purity of the electrostatic concept due to its exceptional linearity and low distortion.

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