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Discontinued Product

Martin Logan Black Ash Theos Speakers - THEBLD

Abt Model: THEBLD | UPC Code: 877929006167
This product is no longer available.

Product Details

Martin Logan Black Ash Theos Speakers, Model THEBLD (Sold As Pair)

MartinLogan is proud to introduce Theos as the most affordable hand-built electrostatic speakers with real wood finishes and custom bi-wire capable binding posts. Descended from MartinLogan's critically acclaimed flagship CLX™ loudspeaker, the Theos features advanced XStat™ electrostatic technology and a proprietary Vojtko™ crossover topology delivering the highest sonic standards of efficiency and precision. A passive 8-inch high excursion woofer and ultra low turbulence down-firing bass port generate unyielding, detailed bass down to 43Hz. Custom coupling spikes and tool-less bi-wire binding posts provide the final touch—providing the ultimate level of flexibility for connection and setup.


  • 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: 30°
  • 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.
  • Sensitivity: 90 dB/2.83 volts/meter
  • Impedance: 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: 425Hz
  • Components: Custom-wound E-I core transformer, air core coils, polypropylene capacitors.
  • Inputs: Custom 5-way bi-wire tool-less binding posts
  • Power Draw:
    • Idle: < 1W/channel
    • Max: 2W/channel

Approximate Dimensions:

  • Height: 59.3"
  • Width: 10.7"
  • Depth: 18.8"

Approximate Weight:

  • Unit: 43 lbs
  • Shipping: 48 lbs

Warranty Information:

Manufacturer Warranty (authorized online retailer): Limited 5 Year

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Key Features
Sold As Pair/ XStat Transducer/ Advanced Vojtko Filtering/ Bi-Wirable Tool-less Binding Posts/ Low-Voltage Power Supply/ 43 - 23,000 Hz +/-3dB Frequency Response/ 30 Degree Horizontal Dispersion/ 90 dB Sensitivity/ 4 Ohms Impedance/ 425Hz Crossover Frequency/ Black Ash Finish
More reasons to buy the MartinLogan THEBLD from Abt Electronics
  • is an authorized dealer (Learn More).
  • The MartinLogan THEBLD is Brand New.
  • The MartinLogan THEBLD Ships in a Factory Sealed Box.
  • Abt ships this product for free!
ConnectivityBinding Posts
Frequency Response43Hz - 23kHz +/-3dB
Enclosure TypeBass Reflex (Ported)
Magnetic ShieldingNo
Sensitivity90 dB
Speaker Design2-Way
Speaker TypeFloorstanding
Tweeter Size (inches)9.2 x 44
Woofer Size (inches)8
Height (inches)59.3
Width (inches)10.7
Depth (inches)18.8


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