Long time MartinLogan enthusiasts are sure to describe ElectroMotion ESL as the second-coming of the legendary Aerius electrostatic speaker which debuted in 1992 and went on to sell in record numbers. The EM-ESL, however, boasts 40 percent more radiating surface, a superbly integrated and authoritative bass performance, and it’s very easy to drive with a sensitivity rated at 91dB! In short, the ESL is capable of being effortlessly powered by both receivers and high-end amplifiers alike.
ElectroMotion ESL’s XStat electrostatic MicroPerf panel is housed within a rigid aluminum and composite AirFrame™ similar to those found on MartinLogan’s flagship products. AirFrame technology stiffens the electrostatic panel without obstructing playable surface area or interfering with ambience enriching dipole sound radiation. At the same time, an AirFrame provides electrical and acoustical isolation, minimizing distortion caused by vibration and resonance, while enhancing imaging, low-level sonic detail, accuracy, and efficiency. MicroPerf technology optimizes the individual holes of The EM-ESL’s electrostatic panel. MicroPerf substantially increases diaphragm radiating area, compared to early generations—without compromising structural integrity. The resulting increase in efficiency allows the EM-ESL’s panel to enjoy a substantial leap in bandwidth and dynamics without growing larger. For example, The EM-ESL’s XStat electrostatic panel features 129 square inches of sound radiating surface on both the front and back and a sensitivity of 91dB into 6 Ohms. That’s almost twice the efficiency of the Aerius, well received its day, which only had 93 square inches and a sensitivity of 89dB into 4 Ohms.
X-Stat: A unique XStat™ transducer was developed for the ElectroMotion ESL to reduce the gauge thickness of the electrostatic panel’s steel stators. The reduced gauge does not alter the performance characteristics of the panel. However, as a natural byproduct of tighter build tolerances, it does increase the visual transparency of the panel. The EM-ESL’s new XStat panel is so visually transparent it nearly vanishes when you’re sitting and listening.
CLS Technology: One of MartinLogan’s original breakthroughs, CLS™ (Curvilinear Line Source) technology, has been an essential ingredient of every electrostatic loudspeaker they’ve produced—and the ElectroMotion ESL is no exception. Proprietary manufacturing methods enable construction of electrostatic panels as cylindrical sections. Their gentle horizontal curve solves the problem of obtaining good high-frequency dispersion from a large radiating surface without compromising overall sound quality or reliability.
Controlled Dispersion Sound Radiation: Another key attribute of the ElectroMotion ESL is its naturally dipolar radiation pattern. The EM-ESL radiates sound with equal intensity from the front and back of its diaphragm, but the outputs are in opposite phase. As a result, sound waves rippling out toward the sides meet at the speaker’s edge and cancel. That and the relatively large size of the ElectroMotion ESL’s electrostatic panel cause output at the sides to be very low relative to that of a conventional loudspeaker, which in turn minimizes side-wall reflections that tend to muddle sonic detail and stereo imaging. While the reduction in output to the sides contributes to the astonishing clarity for which electrostats are revered, the energy reflected off the wall behind the speaker opens up and deepens the sound.
Superb Bass Integration: To seamlessly blend audio output from the electrostatic panel to the woofer the ElectroMotion ESL features a proprietary Vojtko™ topology filter utilizing custom air core coil and low DCR steel laminate inductors, polyester film capacitors and low DF electrolytic capacitors in parallel.
A precise 8-inch high-excursion, perfectly balanced, audiophile grade, doped fiber cone woofer was custom designed exclusively for The EM-ESL by MartinLogan’s in-house engineering team. This woofer precisely optimizes cone suspension and magnetic flux field to produce high levels of bass output and simultaneous precise midrange. The custom woofer’s rigid light-weight diaphragm eliminates cone-flex to achieve remarkably low-distortion and seamless integration with MartinLogan’s award-winning electrostatic panel design.
Easy Connections, Solid Adjustable Footing: Convenient push-style speaker terminals and curved inserts help guide speaker wire effortlessly into place. The rubber end caps on the terminal are also removable for the use of banana plugs instead of bare wire. The EM-ESL is supplied with sturdy, 3/8-16 ETC™ spikes, which can be used to fine tune vertical wave launch, enhance stability on thick carpets, and create tighter coupling between speaker and floor to provide a tighter and detailed bass performance. Each spike is covered by removable rubber feet if you prefer not to use spikes.
Frequency Response: 42–22,000 Hz ± 3dB
Sensitivity: 91 dB/2.83 volts/meter
Impedance: 6 Ohms, 1.6 @ 20 kHz. Compatible with 4, 6, or 8 Ohm rated amplifiers.
Crossover Frequency: 500 Hz
High/Mid Frequency Driver: 86 x 22 cm CLS XStat electrostatic 1,886 cm2
Low Frequency Driver: 8” (20.3 cm) paper cone
Recommended Amplifier Power: 20–300 watts per channel
Weight: 35.5 lbs. (21.4 kg) each
Dimensions (HxWxD) 132.3 x 22.9 x 41.4 cm