In the lab, MartinLogan engineers pursue absolute transparency. In real homes, however, every listening room introduces variables that can dramatically affect bass performance. Room size, shape, and furnishings all influence how low frequencies behave.

For the first time in an electrostatic loudspeaker, MartinLogan integrates exclusive Anthem Room Correction (ARC™) technology. ARC measures your room’s low-frequency response and intelligently adjusts bass output to compensate for acoustic anomalies, delivering performance that closely mirrors MartinLogan’s reference listening environments.

Combined with PoweredForce Forward™ bass technology, ARC minimises room interaction and ensures seamless integration between the electrostatic panel and woofer system. The result is precisely focused imaging, natural tonal balance, and powerful, full-range performance at lifelike listening levels.

This level of refinement is what elevates the Impression ESL 11A from exceptional to truly masterful.

CLS technology is an essential ingredient of every electrostatic loudspeaker we produce. Through MartinLogan's proprietary manufacturing method, they have built-in the panel’s gentle horizontal curvature. This unique design enhances the high-frequency detail produced by the large radiating surface, without compromising overall sound quality. Notice how the gentle modern curve and perforation pattern give way to the flat grille of the woofer section.

The sound we hear from a loudspeaker is a combination of direct radiation from it to our ears, and reflections off of room surfaces—walls, floor, and ceiling. How our brains integrate this information is far from simple. Depending on the angle of incidence to the ears and the arrival-time difference between direct and reflected sound, reflections can either blur detail and stereo imaging, or enhance the natural impression of depth and openness.

Electrostatic panels, which are true dipole speakers, produce a nearly-ideal controlled dispersion radiation pattern. They send very little sound to the sides, thereby minimizing side-wall reflections, whose short arrival times tend to interfere with the perception of the direct sound. Their strong rear radiation, however, produces a generous amount of natural, ambience-enriching, later-arriving mid and upper register information.

The cabinet depth of MartinLogan’s Masterpiece Series speakers is precisely engineered to maximize the performance of both PoweredForce™ and ForceForward™ bass technologies. Combined with Anthem Room Correction (ARC™), this design delivers exceptionally powerful, detailed, and accurate low-frequency performance.

Each Masterpiece Series cabinet establishes an ideal balance between woofer placement, internal volume, and amplification. Two independently sealed enclosures, one for each woofer, provide ample air volume and precise control, allowing the powered woofer system to reach deep bass frequencies with authority while preserving clarity and detail.

ForceForward™ bass technology addresses a common challenge in speaker design: low-frequency soundwaves reflecting off the wall behind the speaker and interfering with those traveling toward the listener. By carefully controlling the phase relationship between opposing woofers, ForceForward™ minimizes these reflections, reducing bass cancellations and excess energy for a cleaner, more accurate response.

This controlled bass launch also simplifies speaker placement. By minimizing rearward bass energy, Masterpiece Series speakers can be positioned closer to the wall than previous generations. As a general guideline, the rear of the cabinet should be no closer to the wall than the diameter of its woofer—12 inches for Renaissance ESL 15A, 10 inches for Expression ESL 13A, and 8 inches for Impression ESL 11A and Classic ESL 9. For additional fine-tuning, powered Masterpiece Series models include dual bass level controls at 75Hz and 200Hz.

As with all electrostatic designs, the dipole panel performs best when placed at least 2.5 feet from the wall behind it, a distance that benefits not only electrostatic speakers but nearly all high-performance loudspeakers.

Connect your electronics safely and securely using 5-Way audiophile WBT Binding Posts. Their pure copper connection plate is highly conductive and free from eddy current effects. These posts are insulated for shock protection and fully damped against vibrations. They give you plenty of room for large-gauge professional speaker connections.

MartinLogan’s dedicated in-house design and engineering team created an extremely precise 24-bit Vojtko Digital Signal Processing (DSP) engine to work in conjunction with these powerful new amplifiers. It gives these speakers the ability to deliver detailed low-frequency performance reaching down to 24Hz. Advanced DSP allows complete control and performance optimisation over the low-pass filters, woofer equalization and limiting functions, all of which are mapped mathematically in the digital domain.

Complete control of the signal, along with instant response, huge amounts of clean power, and efficient, integrated performance, paints an original picture of lifelike audio performance.