o XStat Transducer technology: a package of technologies (too numerous to list) that allow MartinLogan to use an incredibly thin (just 0.0005-inches thick) conductive diaphragm that is driven in push-pull fashion between a pair of the firm’s signature MicroPerf stators. The driver is said to provide exceptional linearity, wide bandwidth, low distortion, and to play surprisingly loudly without danger of arcing or other damage.
o MicroPerf stator technology: Many electrostatic drivers use heavy, bulky, grid-like stators that block part of the sound emanating from the diaphragms within, but MartinLogan electrostats use insulated steel stators with myriad tiny “microperf” openings spread over their entire surface, allowing more sound from the diaphragm to pass through unimpeded. MartinLogan claims that output from its panels can match the output of competing electrostatic panels twice their size.
o AirFrame technology: MartinLogan uses light, compact, yet exceptionally rigid extruded aerospace-grade aluminum frames both to support its electrostatic panels and to attach them to woofer enclosures below, while minimizing unwanted vibration or resonance.
• The EM-ESL uses a long-throw, high-rigidity, paper cone mid-bass driver housed in a reflex enclosure (with a downward-firing port).
• Importantly, the woofer enclosure features a non-resonant “asymmetrical chamber” design, as can plainly be seen when the woofer section of the EM-ESL is viewed from the side. As an appealing and useful detail touch, the EM-ESL comes fitted with beefy floor spikes that are, in turn, equipped with removable rounded floor shields. The concept is that users will leave the floor shields in place until a final position for the speakers is found. Then, if the room features carpeted floor surfaces, the shields can be removed to allow the spikes to more firmly anchor the speaker to the floor.
• The EM-ESL is offered in either matte or gloss black finishes.
• IMPORTANT POINT: The EM-ESL speakers come with what I regard as hands down the finest manual I have ever encountered with any loudspeaker (competitors take note)—or for that matter the finest manual I’ve found for any type of audio product. If you buy these speakers, then, do yourself a favor and take time to read the manual and to follow the invaluable speaker positioning tips found within.
ElectoMotion C2 center-channel speaker, technical highlights:
• The signature technology found in the ElectroMotion C2 (EM-C2 for short) is MartinLogan’s Heil-type “Folded Motion XT” tweeter, which is similar in concept to the tweeters used in the firm’s less costly Motion-series speakers. A big difference, however, is that the 2.4-inch high x 1.27-inch wide Folded Motion XT driver used in the EM-C2 is a whopping 40% larger in area than the standard Motion driver—a change said to give it wider bandwidth and improved efficiency.
• One interesting note is that the diaphragms in Heil-type drivers are pleated and therefore have much greater radiating area than the driver openings, themselves, would suggest. For example, the radiating area of the C2 tweeter is specified at 4.5-inches x 2.75-inches. Impressive.
• Sonically, Heil-type folded motion drivers are thought to provide some of the same desirable qualities as electrostatic driver, such as transient speed, good linearity, and relatively wide bandwidth, plus an ability to play more loudly than you would think, given their diminutive size. They are also less costly to produce than electrostatic panels.
• The EM-C2 sports two 5.25-inch paper cone mid-bass drivers arranged in a D’Appolito-like (midrange-tweeter-midrange) array with the Folded Motion XT tweeter in the center.
• The EM-C2 provides a dual-ported (front-firing ports), “non-resonant, asymmetrical chamber format” enclosure. Apart from helping minimize internal reflections and standing waves, the asymmetrical enclosure provides a tipped-back mounting position that helps direct energy from the center speaker upward toward the listening area (when the speaker is positioned on a shelf below the screen). Alternatively, the speaker can be flipped upside down, which will cause the front baffle to point straight forward (rather than tilting upward by a few degrees as would normally be the case).
• The EM-C2 is offered in an attractive matte black finish with a perforated black metal grille that provides large openings over the Folded Motion XT tweeter.