MartinLogan Expression ESL 13A Electrostatic Floorstanding Speaker (Each)
- Brand: Martin Logan
- Product Code: Expression ESL 13A Used
Free Lifetime Technical Assistance
x 13" XStat™ CLS™ Transducer
10-inch PoweredForce Forward™ Woofers
with Dual 300W / Channel Amplifiers
Hz ±3dB Frequency Response
Vojtko™ DSP Engine
Room Correction (ARC™) ready
LISTED AS AN INDIVIDUAL SPEAKER
Expression ESL 13A
Audio is both real, and imagined. There is the fact of the
sound. And there is the feeling that the sound arouses within us.
This feeling is the inspiration behind the new Expression
ESL 13A. Like the Expressionist masterpieces, this artful presentation of
audio is focused solely on intensifying your emotional experience. It’s a
virtually transparent audio performance that transports you to a new landscape
of the senses.
The Art of Emotion in Audio
The Expression ESL 13A is part of the Masterpiece Series. It
features a dual 10-inch woofer system with ARC-honed performance, for perfectly
blended low-frequency response. The groundbreaking integration of this woofer
array with MartinLogan’s signature 13-inch wide XStat CLS Transducer, coupled
with a powerful dual amplifier section, delivers an expressive and dynamic
audio experience, with less coloration. It reveals the pure emotional impact of
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 Expression ESL 13A woofer
section, powered by new dual 300-watt Class-D amplifiers, and controlled by a
24-Bit Vojtko™ DSP Engine and ARC™ (Anthem Room Correction).
Using two 10-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.
Achieving the Laboratory Standard in Your Own Room
In the lab, MartinLogan engineers strive for transparency.
Outside the lab, there’s one wildcard our engineers can never account for: Your
listening room. The unique size and shape of your listening space (and the size
and shape of its contents) can make bass waves do unpredictable things, greatly
affecting a speaker’s overall performance.
The Expression ESL 13A integrates exclusive Anthem Room
Correction (ARC) technology. By engaging ARC to control the low-frequency curve
in relation to the output of the ESL panel (as seen in this graph), you will
experience performance on par with MartinLogan’s audio test lab.
ARC measures low-frequency sound output in your room and
compares it to optimal response curves that account for spatial anomalies. The
advanced algorithms of ARC then effectively remove the anomalies, leaving only
the ideal standard: realistically blended, natural-sounding bass performance in
your listening space.
By minimizing room interactions with PoweredForce Forward
bass technology and the advanced room correction capabilities of ARC, along
with its unique synthesis of the ESL and bass sections, the Expression ESL 13A
produces perfectly-etched imaging and focus; optimum natural reproduction of
sound at lifelike listening levels; and agile, full-range operation in open
Clearly, it is this level of ultimate performance that
separates the merely excellent from a true masterpiece.
New Ultra-Rigid AirFrame Blade Design
Expression ESL 13A 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
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 AirFrameBlade design enhances imaging, low-level
sonic detail, accuracy, and speaker efficiency.
Curvilinear Line Source (CLS) Electrostatic Panel
CLS technology is an essential ingredient of every
electrostatic loudspeaker we produce. Through our proprietary manufacturing method,
we 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 gives way to the flat grille of the woofer section.
Controlled Dispersion Sound Radiation
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.
New PoweredForce Forward™ Bass Technology
PoweredForce Forward bass technology combines two
MartinLogan audio innovations: PoweredForce, which allows small enclosures to
accurately produce massive amounts of bass, and ForceForward, which
significantly reduces performance-robbing front-wall bass reflections.
PoweredForce Forward bass technology uses an advanced
crossover topology with phase-timed woofers to minimize destructive reflected
energy. By virtually eliminating front-wall bass reflections and working in
tandem with the panel, PoweredForce Forward Bass Technology gives you more
placement flexibility, and enhances the true audio realism of your sound
New More performance, versatility, and safety, with
WBT Binding Posts
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.
New Powerful Dual 300-Watt Class-D Amplification
with 24-Bit Vojtko™ DSP Engine
The performance of Expression ESL 13A has been reconsidered
from the ground up. Taking full advantage of innovations like PoweredForce
Forward and ARC Technology, and the integration of the electrostatic panel with
the woofer array, required daring thinking about power and efficiency. Our new
dual 300-watt amplifiers produce clean power, in a small space, more
efficiently than ever before. They enable the effortless delivery of
exhilarating dynamic impact, with plenty of overhead. Superior, reliable
Class-D technology means there’s virtually no energy lost between the
amplifiers and the woofers.
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
optimization 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.
Precision-Built Advanced-Topology Vojtko Crossover
Vojtko Voiced, the advanced crossover and electronics in
Expression ESL 13A add enhanced mid-range clarity to this artful composition.
Carefully hand-built using only the finest polypropylene capacitors and
air-core coils, the crossover employs MartinLogan’s proprietary Vojtko topology
for vanishingly low distortion and seamless driver/ESL integration. This
precision-tuned network preserves even the most microscopic sonic nuances while
handling the full dynamics of any source.
We’ve also considered the signal you will feed your loudspeakers, and have engineered Expression ESL 13A to work well with practically any type of electronics. MartinLogan’s state-of-the-art toroidal transformer and electrical interface engineering ensure an absolutely transparent link from amplifier to electrostatic panel and woofer array. This produces sound of unparalleled purity, precision, clarity, and openness — the next best thing to no speaker at all.
Gloss Black Dark Cherry Walnut
Premium Finish Options:
Rosso Fuoco Cordoba Red Deep Sea Blue Basalt Black
(Gloss Red) (Gloss Metallic Maroon) (Gloss Metallic Blue) (Gloss Metallic Black)
Meteor Grey Desert Silver Arctic Silver
(Gloss Metallic Silver, Dark) (Gloss Metallic Silver, Tan tint) (Gloss Metallic Silver, Light)
24–23,000 Hz ±3dB
44" (112cm) line source
High Frequency Transducer
XStat™ CLS™ electrostatic transducer
» Panel Dimensions
44" × 13" (111.8 × 33cm)
» Radiating Area
572 in2 (3,689 cm2)
Low Frequency Transducer
Two 10” (25.4 cm) cast bracket, high excursion, rigid aluminium cone with extended throw drive assembly, non-resonance asymmetrical chamber format
Room Correction (Bass Section)
Anthem Room Correction (ARC™) ready (Sold Separately)
Woofer: 2 x 300 watts/channel (4 ohms), 2 x 600 watts peak
91 dB/2.83 volts/meter
4 Ohms, 0.7 at 20kHz. Compatible with 4, 6, or 8 Ohm rated amplifiers.
Recommended Amplifier Power
20‒600 watts per channel
Custom-wound audio transformer, air core coils, polypropylene capacitors. 24-bit DSP based preamplifier (used with woofer amplifier).
Bass: ±10 dB under 75 Hz
LED intensity control: on, dim, off
AC Power, RJ45 (for ARC), mini USB (for ARC)
Idle: < 1W/channel
103 lbs. (46.8 kg)
61.5" × 13.4" × 27.5"
Specifications are subject to change without notice.