Electrostatic On-Wall

Get off the floor and on the wall with the EFX electrostatic on-wall speaker. This versatile on-wall electrostat is the perfect surround speaker for any MartinLogan home theater system.

$4,399.98 pair
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EFX Finishes


Price: $4,399.98 pair

Sold As: pair

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Surround Yourself with EFX

MartinLogan is proud to introduce the slim, on-wall EFX™ hybrid electrostatic loudspeaker, featuring XStat™ technology, dramatically reducing cabinet size, yet establishing new standards for efficiency, dynamics and precision.

CLS™ XStat Transducer

Housed within a radical, ultra-ridged extruded aluminum AirFrame™, the EFX's new CLS XStat transducer builds upon the legacy of MartinLogan's electrostatic heritage with the incorporation of advanced vacuum bonding and MicroPerf stat panels, providing even greater efficiency and precision.

Slim On-Wall Profile

If you won't settle for anything but electrostats next to your new flatscreen TV, the EFX is the perfect solution at just 6.5-inches deep. Free up precious floorspace by mounting EFX to your wall with the included wall brackets. The EFX is also the ultimate high-performance home theater surround speaker and complements MartinLogan's entire line of electrostatic loudspeakers. EFX rotates with the pivoting wall bracket to easily focus your surround sound experience.

Advanced Vojtko Filtering

Proprietary Vojtko filtering technology is utilized for EFX's electrostatic transducer. This audiophile quality network, derived from the CLX, is carefully hand-built using precision point-to-point wiring, polypropylene capacitors, massive air-core coils, and a custom wound E-I core transformer—flawlessly preserving micro-acoustic subtleties while effortlessly handling the broadest range of dynamics contained within even the most demanding sonic source.

Custom 5-Way Binding Posts and Low-Voltage Power Supply

MartinLogan's proprietary tool-less binding posts simplify cable connection and management. EFX features custom 5-way binding posts and provide the ultimate level of flexibility for connection and setup. To further simplify setup and cable management, the EFX features a low-voltage DC power supply eliminates the need for a traditional, heavy IEC power cord.




Specifications are subject to change without notice

Frequency Response

68–22,000 Hz ±3dB

Recommended Amplifier Power

20—300 watts per channel

Horizontal Dispersion


Vertical Dispersion

28" (71cm) line source


90 dB/2.83 volts/meter


6 Ohms, 1.3 @ 20kHz Compatible with 4, 6, or 8 Ohm rated amplifiers.

Crossover Frequency


High Frequency Transducer

XStat™ CLS™ electrostaic transducer » Panel Dimensions: 28" x 8.6" (71 x 22cm) » Radiating Area: 241 in² (1,562 cm² )

Low Frequency Transducer

6.5" (16.5cm) high excursion, fiber cone with extended throw drive assembly; bass reflex


Custom-wound E-I core transformer, air core coils, metal film capacitors


Custom 5-way binding posts

Power Draw

Max: 2W each Standby: <1W each


24.5 lbs. (11.1 kg)


48.8" x 9.4" x 6.5 " (123.9cm x 23.8cm x 16.5cm)

Customer Reviews For EFX

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Michael W.

  • Friday, July 5, 2019

The first ML speaker I owned was the SLM - I was shocked at the incredible sound. I had this same experience going from the SLM to the EFX. I used both as mains for home theater and stereo. Each Martin Logan product is amazing. The EFX sounds like a huge speaker and all the fine details of sound is present. When playing stereo, I had to check my other speakers several times if I was running surround sound... because the sound is so subversive. It wraps around me and can not be pin pointed to a source. Placement is important but not hard to set up - distance apart and the angle towards the listener make a big difference. Not too far apart seems good for my room (8’). The bass is light with this size speaker, of course, but with a subwoofer and proper set up of the audio processor, this can be resolved. It takes a long time to break in. I don’t think mine ever did until I moved and was able to play loudly. I highly recommend.