Martin Logan Theos Electrostatic Loudspeaker

Martin Logan Theos in Zebra Wood Finish Martin Logan Theos in Zebra Wood Finish Martin Logan Theos Front Panel Martin Logan Theos in Gloss Black Martin Logan Theos in Back Ash Martin Logan Theos Electrostatic Loudspeaker Martin Logan Theos Back Panel Martin Logan Theos in Dark Cherry

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Theos Overview

Martin Logan's 'Theos' a highly sophisticated, hand-build electrostatic speaker, encased in a variety of high quality, real wood finishes and custom bi-wire capable binding posts. 

The Theos is built from the prestigiously regarded flagship CLX loudspeaker and features advances XStat electrostatic technology methods, with a proprietary Vojtko cross-over topology. This enables the Theos to deliver an astonishing standard of sonic efficiency, accuracy and precision. 

The Theos utilises a passive 8-inch excursion woofer, and a phenomenally low turbulence downward firing bass port to produce an unrestricted and exceptionally enhanced bass response. The custom coupling spikes, and tool-less bi-wire binding posts add the final touch, offering the ultimate level of flexibility for connection and set-up.

XStat™ Transducer

Sharing with its PoweredForce™ counterpart Ethos, a unique XStat™ transducer was developed to exclusively address specific mechanical requirements. Vertically identical in size and dispersion to the flagship Summit™ X, Theos' thinner 9.2-inch (23cm) horizontal panel dimension required a tighter curve to achieve MartinLogan's distinct 30-degree dispersion pattern. To accomplish this MartinLogan engineers reduced the gauge thickness of the steel stators. The reduced gauge does not alter performance characteristics of Theos' electrostatic panel. However, as a natural byproduct of tighter build tolerances, visual transparency of the panel is increased significantly. Theos' new XStat panel is so visually transparent that it nearly vanishes when you're sitting and listening.

Advanced Vojtko Filtering

Proprietary Vojtko filtering technology is utilized for Theos' 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.

Bi-wirable Tool-less Binding Posts and Low-Voltage Power Supply

MartinLogan's proprietary tool-less binding posts simplify cable connection and management. Two sets are supplied—one connected to the electrostatic panel and the other feeding the woofer. Listeners can choose to vertically/horizontally bi-amp the Theos, or use jumper clips between the binding post sets for a single wire-connection. Theos features bi-wirable binding posts and provide the ultimate level of flexibility for connection and setup. To further simplify setup and cable management, the Theos features a low-voltage DC power supply eliminates the need for a traditional, heavy IEC power cord

Frequency Response

43–23,000 Hz ±3dB

Horizontal Dispersion


Vertical Dispersion

44" (112cm) line source

High Frequency Transducer

XStat™ CLS™ electrostatic transducer

» Panel Dimensions

44" × 9.2" (111.8 × 23.4cm)

» Radiating Area

405 in2 (2,616 cm2)

Low Frequency Transducer

8" (20.3cm) cast basket, high excursion, aluminum cone with extended throw drive assembly, non-resonance asymmetrical chamber format, down-firing bass reflex port.


90 dB/2.83 volts/meter


4 Ohms, 0.8 at 20kHz. Compatible with 4, 6, or 8 Ohm rated amplifiers.

Recommended Amplifier Power

20‒400 watts per channel

Crossover Frequency



Custom-wound E-I core transformer, air core coils, polypropylene capacitors.


Custom 5-way bi-wire tool-less binding posts

Power Draw

Idle: < 1W/channel
Max: 2W/channel


43 lbs. (19.5 kg)


59.3" × 10.7" × 18.8"
(150.7cm × 27.3cm × 47.8cm)

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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