Befitting a loudspeaker of this name, MartinLogan has combined decades of innovations, and more, to reinterpret the uniquely detailed electrostatic loudspeaker. This is a flagship audio achievement for the 21st Century.

The pièce de résistance is the integration of MartinLogan’s award-winning 15-inch wide Curvilinear Line Source (CLS™) XStat™ electrostatic (ESL) transducer with its robust woofer section, the revolutionary melding of design and engineering.

Look at the familiar elements of the classic MartinLogan electrostatic loudspeaker: Advanced MicroPerf stator technology, which allows for almost twice the exposed electrostatic diaphragm surface as a traditional electrostatic panel of the same size. The panel is reinforced with rigid ClearSpar™ spacers, keeping an exact level of tension on the vacuum-bonded diaphragm without obscuring the beautiful see-through design. Add the slender, pointed-arrow design of the new AirFrame™ Blade construction; a powerfully evocative composition creating a harmonious connection between the panel and its woofer cabinet.

Now notice some radical refinements: Inspired by our own breakthrough design, we have reinvented the Renaissance ESL 15A woofer section, powered by new dual 500-watt Class-D amplifiers, and controlled by a 24-Bit Vojtko™ DSP Engine and ARC™ (Anthem Room Correction).

Using two 12-inch laser-engineered low-distortion aluminum cone woofers in independently enclosed compact chambers, exclusive PoweredForce Forward™ bass alignment technology controls the interaction between the rear-firing woofer and the wall behind that woofer. With smart phase-shifting logic, we minimize the effect that wall has on bass information that might bounce back into the listening room. This uniform frequency response results in realistic bass effects you can feel. It’s one more way MartinLogan innovation improves your listening experience in any room

Expression ESL 15A XStat panels are joined to their speaker cabinets using MartinLogan’s redesigned AirFrame Blade construction, precision manufactured from an aerospace-grade extruded aluminum alloy. This material, and this exclusive manufacturing process, makes the panels extremely rigid.

The bold, forward-moving styling of this AirFrame Blade rail system, narrow and strong in front, broad and forceful from the side, is a modern design statement. It never obstructs playable surface area or interferes with the panel’s dipole sound radiation pattern. It also provides electrical and acoustical isolation, minimizing intermodulation distortion caused by vibration and resonance. The flowing lines emphasize the groundbreaking integration of the panel itself with the compact woofer and amplifier section. The breathtaking AirFrame Blade design enhances imaging, low-level sonic detail, accuracy, and speaker efficiency.

Specifications : Martin Logan Renaissance ESL 15A

Frequency Response

22–21,000 Hz ±3dB

Recommended Amplifier Power

20—700 watts per channel

Horizontal Dispersion

30°

Vertical Dispersion

46″ (116.9cm) line source

Sensitivity

92 dB/2.83 volts/meter

Impedance

4 Ohms, 0.5 at 20kHz Compatible with 4, 6, or 8 Ohm rated amplifiers.

Crossover Frequency

300Hz

High Frequency Transducer

XStat™ CLS™ electrostatic transducer. » Panel Dimensions : 46″ x 15″ (117 x 38cm). » Radiating Area : 690 in² (4,446 cm² )

Low Frequency Transducer

Two 12” (30.5 cm) PoweredForce Forward™ woofers with cast basket, high excursion, rigid aluminium cone and extended throw drive assembly, non-resonance asymmetrical chamber format.

Amplifier

Woofer: 2 x 500 watts/channel (4 ohms), 2 x 1,000 watts peak

Room Correction (Bass Section)

Anthem Room Correction (ARC™) ready (Sold Separately)

Components

Custom-wound audio transformer, air core coils, polypropylene capacitors. 24-bit DSP based preamplifier (used with woofer amplifier).

Audio Controls

Bass: ±10 dB under 75 Hz Mid-Bass: –2 dB, 0 db, +2 db Light: On, Dim, Off ARC™ Room EQ: On, Off

Signal Inputs

WBT-0703Cu nextgen™ 5-way binding posts feature a filigree signal conductor made from gold plated, nickel free, non- ferromagnetic, pure copper for high conductivity and fully insulated. Free from eddy current effects.

Inputs

AC Power, RJ45 (for ARC), mini USB (for ARC)

Power Draw

Idle: < 0.5W/channel Max: 900W/channel

Lighting

LED intensity control: on, dim, off

Weight

140 lbs. (63.5 kg)

Dimensions

69.8″ x 15.75″ x 28.9 ” (177.3cm x 40cm x 63.3cm)