Martin Logan Classic ESL 9Martin Logan Classic ESL 9
Martin Logan

Classic ESL 9 Electrostatic Speakers

The Classic 9 is a completely passive design features a 9.2-inch (CLS™) XStat™ electrostatic transducer, dual 8-inch aluminium-Cone woofers, and custom 5-way bi-wire tool-less binding posts.

Clear
3 Years
Enquiry

Description

All the familiar elements of Martin Logan’s flagship ESL series are here, with some revolutionary refinements. The heart of this exceptional loudspeaker is its 9.2-inch-wide Curvilinear Line Source (CLS) XStat vacuum-bonded electrostatic transducer. Advanced MicroPerf stator technology reveals more of the diaphragm surface area than any other electrostatic panel in this size class, efficiently increasing the narrow panel’s output. Ultra-rigid AirFrame Blade construction reduces performance-robbing vibrations, its shape creating an expressive alignment with the woofer cabinet. Deep bass is rendered with unflinching accuracy and authority by dual 8-inch low-distortion, high-excursion aluminium cone woofers in a beautifully sculpted enclosure.

Look at the familiar elements of the classic Martin Logan 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. A reinforced electrostatic panel with rigid ClearSpar™ spacers, keeping an exact level of tension on the vacuum-bonded diaphragm without obscuring the beautiful see-through design. Add to these the slender, pointed-arrow design of the new AirFrame™ Blade construction and the result is a powerfully evocative composition creating a harmonious connection between the panel and its woofer cabinet.

Classic Elements, Experienced In a New Way: Advanced MicroPerf stator technology, which allows for almost twice the exposed electrostatic diaphragm surface as a traditional electrostatic panel of the same size. A reinforced electrostatic panel with rigid ClearSpar™ spacers, keeping an exact level of tension on the vacuum-bonded diaphragm without obscuring the beautiful see-through design. Add to these the slender, pointed-arrow design of the new AirFrame™ Blade construction and the result is a powerfully evocative composition creating a harmonious connection between the panel and its woofer cabinet.

Now notice some refinements: We have reinvented the Classic ESL 9 woofer section. We use two 8-inch laser-engineered low-distortion aluminium cone woofers, balanced in an opposing array, one forward- and one rear-firing. This design greatly reduces cabinet vibrations inherent in same-direction woofer positioning, specifically in the 34Hz to 100Hz range for uniform frequency response resulting in realistic bass effects you can feel.

Classic ESL 9 XStat panels are joined to their speaker cabinets using MartinLogan’s redesigned AirFrame Blade construction, precision manufactured from an aerospace-grade extruded aluminium 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.

Frequency Response
34–23,000 Hz ±3dB

Recommended Amplifier Power
20—400 watts per channel

Horizontal Dispersion
30°

Vertical Dispersion
44″ (112cm) line source

Sensitivity
90 dB/2.83 volts/meter

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

Crossover Frequency
380Hz

High Frequency Transducer
XStat™ CLS™ electrostatic transducer » Panel Dimensions: 44″ x 9.2″ (112 x 23cm) » Radiating Area: 405 in² (2,576 cm² )

Low Frequency Transducer
Two 8” (20.3 cm) cast basket, high excursion, rigid aluminium cone woofers with extended throw drive assembly, non-resonance asymmetrical chamber format

Components
Custom-wound audio transformer, air core coils, low DCR steel laminate coils, polyester capacitors

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

Power Draw
Max: 2W per channel Standby: <1W per channel

Weight
78 lbs. (35.4 kg)

Dimensions
59.8″ x 10.4″ x 25.4 ” (152cm x 26.4cm x 64.6cm)