The MartinLogan Expression ESL 13A is a flagship hybrid electrostatic loudspeaker that combines the company's renowned XStat™ electrostatic technology with powerful built-in bass amplification and sophisticated digital signal processing. Designed as a cornerstone of the Masterpiece Series, the Expression ESL 13A features a massive 44-inch by 13-inch electrostatic panel paired with dual powered 10-inch aluminum woofers, delivering breathtaking transparency, effortless dynamics, and bass extension down to an astonishing 24 Hz. It is engineered to reproduce music with extraordinary realism while offering the authority and scale demanded by today's finest home theater systems.
At the heart of the Expression ESL 13A is MartinLogan's XStat™ CLS™ Curvilinear Electrostatic Transducer enhanced with MicroPerf™ stator technology. This advanced design increases the radiating area without enlarging the panel, resulting in greater efficiency, higher output capability, and even lower distortion. Working alongside the proprietary 24-bit Vojtko™ DSP engine, custom-wound transformer, and premium crossover network, the electrostatic panel delivers astonishing vocal realism, pinpoint imaging, and an expansive soundstage with virtually no audible coloration.
Low-frequency reproduction is handled by two high-excursion 10-inch aluminum woofers, each powered by its own dedicated 300-watt Class-D amplifier utilizing MartinLogan's PoweredForce Forward™ bass alignment technology. Integrated Anthem Room Correction (ARC™) compatibility and adjustable bass controls allow the speaker to optimize its low-frequency performance for virtually any listening environment, producing exceptionally deep, articulate, and controlled bass while maintaining seamless integration with the electrostatic panel.
Designed for the most demanding audiophiles, the Expression ESL 13A combines advanced electrostatic engineering, active bass amplification, and elegant industrial design into a truly reference-class loudspeaker. Its AirFrame Blade™ architecture, premium WBT nextgen™ binding posts, and handcrafted internal components reflect MartinLogan's uncompromising approach to performance, making the Expression ESL 13A an exceptional choice for listeners seeking the highest levels of musical realism, dynamic range, and acoustic precision.
- Component type: Hybrid electrostatic powered floorstanding speaker
- High-frequency / midrange driver: 44-inch × 13-inch XStat™ CLS™ Curvilinear Electrostatic Transducer with MicroPerf™ technology
- Electrostatic radiating area: 572 sq in (3,696 cm²)
- Low-frequency drivers: Dual 10-inch high-excursion rigid aluminum cone woofers with cast baskets
- Built-in amplifier: Dual 300 W Class-D amplifiers (600 W peak each) dedicated to the woofer section
- Frequency response: 24 Hz – 23 kHz (±3 dB)
- Sensitivity: 91 dB (2.83V/1m)
- Impedance: 4 ohms (0.7 ohms minimum at 20 kHz)
- Recommended amplifier power: 50–600 W per channel
- Crossover frequency: 300 Hz
- Horizontal dispersion: 30°
- Vertical dispersion: 44-inch line source
- Audio controls: Bass (±10 dB below 75 Hz), Mid-Bass (-2 dB / 0 dB / +2 dB), LED lighting (On / Dim / Off), ARC™ Room EQ On/Off
- Room correction: Anthem Room Correction (ARC™) Ready
- Inputs: WBT-0703Cu nextgen™ 5-way binding posts, AC power, RJ45 (ARC), Mini USB (ARC)
- Enclosure: PoweredForce Forward™ bass alignment with non-resonant asymmetrical chamber
- Dimensions (H × W × D): 61.5 × 13.4 × 27.5 in (156.1 × 33.9 × 69.9 cm)
- Weight: 103 lb (46.8 kg) each
- Finishes: Gloss Black, Dark Cherrywood
- Design features: XStat™ CLS™ electrostatic panel, MicroPerf™ stator technology, PoweredForce Forward™ bass system, 24-bit Vojtko™ DSP engine, AirFrame Blade™ construction, custom-wound audio transformer, premium crossover components