Martin Logan EFX Electrostatic Loudspeaker

Lifestyle shot of the EFX EFX Electrostatic Surround Sound Speaker from Martin Logan EFX Electrostatic Surround Sound Speaker from Martin Logan EFX Electrostatic Surround Sound Speaker from Martin Logan EFX Electrostatic Surround Sound Speaker from Martin Logan

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Surround Yourself with EFX

Martin Logan's EFX is a hybrid electrostatic loudspeaker, catered for wall-mountability and home-theatre surround sound. This sophisticated speaker utilises XStat technology, which greatly decreases the space taken up by the speaker's cabinet, but also delivers highly impressive efficiency, dynamics and precision. 

CLS™ XStat™ Transducer

Placed within a profound, ultra-ridget extruded aluminium 'AirFrame', the recent CLS XStat transducer builds upon the same concept and philosophy of Martin Logan's electrostatic speaker options, but also incorperates a highly advanced vacuum bonding method and 'MircroPerf' stat panels. This enables the EFX to deliver an even greater and more precise sound than that of its competitors.

Slim On-Wall Profile

The EFX is a perfect match for your flat screen TV, being only 6.5 inces in depth. You are able to make the most of your precious floorspace by mounting the speakers on your wall with the dedicated wall brackets included. The EFX is one of the most sophisticated and glorious sounding home theatre surround sound options available, and compliments Martin Logan's entire range of Electrostatic speakers. The EFX also rotates, thanks to its pivoting wall bracket. This allows you to focus your surround sound experience to directly fit your requirements.

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.

quency Response

68–22,000 Hz ±3dB

Horizontal Dispersion


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


90 dB/2.83 volts/meter


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

Recommended Amplifier Power

20‒300 watts per channel

Crossover Frequency



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" × 9.4" × 6.5"
(123.9cm × 23.8cm × 16.5cm)


Specifications are subject to change without notice.

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Providing your item is in stock, the order is usually dispatched within 24 hours. Please remember that postage and packing is completely free for orders over £50*. Out of stock items will be dispatched as soon as they become available, out of stock items can take between 4 to 21 days for dispatch.

Deliveries usually take 1-3 working days. The majority of orders are sent via our couriers'; Interlink Express on a next-day-delivery service. Smaller, low value or light-weight items are normally posted using Royal Mail Recorded or Royal Mail Special Delivery.

Once your product has been dispatched, you will be notified via email and sent a unique consignment number, you can use this number at to check the status of your delivery. If you have provided a mobile telephone number, Interlink's Predict service will notify you by text (and email) of a one-hour delivery window. If the window they suggest is inconvenient, you can change the date of delivery to a later one via text or email.

*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however delivery to these locations will incur a charge and can only be sent via a 2-day service.

Shipping CostsMainland UK (Next-Day)Offshore/Out-of-reach (2-day)Northern Ireland, Channel Islands, Isle of Man, Scottish Islands, Scilly IslandsRepublic of Ireland (2-day)
Under £50 Orders £7.50 £12.50 £15.00
Over £50 Orders FREE £19.99 £29.99
Surcharge Orders £50.00 £69.99 £79.99
Saturday Delivery £12.99 N/A N/A
Sunday Delivery £12.99 N/A N/A
Saturday by 12 Delivery £35 N/A N/A


Post codes exempt from the free delivery service include:

Scottish Highlands Post Codes: AB30-38, AB41-42, AB44-56, FK17-99, G83, IV1-28, IV30-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH15-26, PH31-41, PH49-50
Islands Post Codes: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA41-49, PA60-78, PH42-44, ZE1-3
Northern Ireland: All BT postcodes
Channel Islands Post Codes: JE, GY
Scilly Isles Post Codes: TR21, TR22, TR23, TR24, TR25