Martin Logan EFX On-Wall Electrostatic Loudspeakers – Pair


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On-Wall Swivel Mounting Options
28″ x 8.6″ XStat™ CLS™ Transducer
Slim Profile, 6.5″ Depth
6.5-inch Fiber Cone Woofer
Bass Reflex Port


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.

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.

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.

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.

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.

Frequency Response 68–22,000 Hz ±3dB
Horizontal Dispersion 30°
Vertical Dispersion 28″ (71cm) line source
High Frequency Transducer XStat™ CLS™ electrostaic transducer
» Panel Dimensions 28″ × 8.6″ (71.1 × 21.8cm)
» Radiating Area 241 in2 (1,550 cm2)
Low Frequency Transducer 6.5″ (16.5cm) high excursion, fiber cone with extended throw drive assembly; bass reflex
Sensitivity 90 dB/2.83 volts/meter
Impedance 6 Ohms, 1.3 @ 20kHz. Compatible with 4, 6, or 8 Ohm rated amplifiers.
Recommended Amplifier Power 20‒300 watts per channel
Crossover Frequency 530Hz
Components Custom-wound E-I core transformer, air core coils, metal film capacitors
Inputs Custom 5-way binding posts
Power Draw Max: 2W each
Standby: <1W each
Weight 24.5 lbs. (11.1 kg)
Dimensions 48.8″ × 9.4″ × 6.5″
(123.9cm × 23.8cm × 16.5cm)

Additional information

Weight 65 lbs
Dimensions 55 × 40 × 30 in


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