MartinLogan EFX
MartinLogan EFX — electrostatic clarity in a compact on-wall speaker
The MartinLogan EFX pairs a tall XStat™ CLS™ electrostatic panel with a 6.5" high-excursion woofer to deliver a rare blend of airy top-end and controlled low-frequency impact in a compact on-wall form. Its most compelling quality is line-source electrostatic clarity: the 28" panel and wide radiating area translate to pinpoint imaging, exceptional treble extension and an open, lifelike midrange.
Sonically the EFX offers tight, well-controlled bass for its size (ported enclosure plus a high-excursion driver), a transparent midrange rich in vocal timbre, and refined, low-distortion highs. Performance scores highlight outstanding imaging and treble (both in the mid-90s) and strong dynamics and bass for a bookshelf/on-wall hybrid. The speaker’s 90 dB sensitivity and 20–300 W recommended amplifier range mean it scales well with amplifier power while remaining revealing of upstream electronics.
Build quality is robust: custom-wound transformer, air-core coils and metal-film caps underpin a premium feel and durability. Ideal for listeners seeking electrostatic-level detail and a tall, coherent soundstage without a floor-standing footprint, the EFX is a compelling choice for critical two-channel systems and front-channel home-theater roles at its price point. See the hands-on take from Brian Mitchell at ecoustics.
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Deliciously Crispy
Sound Quality
92/100
Build Quality
92/100
Features Connectivity
80/100
Value for Money
85/100
Pros
Exceptional high-frequency detail and wide, stable imaging thanks to the 28" XStat CLS electrostatic panel.
Surprisingly tight, controlled bass for a compact on-wall speaker—6.5" high-excursion woofer plus porting delivers usable low-frequency extension.
High-quality components and solid construction (custom-wound transformer, air-core coils, metal-film caps) give the EFX a premium, durable feel.
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SOUND QUALITY PERFORMANCE 92/100
Bass
90/100
For its size (6.5" high-excursion woofer + bass-reflex enclosure paired with a 28" electrostatic panel), the EFX should deliver uncommon low-frequency extension and control for a bookshelf. Recommended amp power up to 300W and a high-excursion driver support tight, well-controlled bass; ported design and sensitivity (90 dB) suggest usable room output. Score reflects "excellent for size" performance based on the transducer/enclosure combination.
Mid
93/100
The large XStat electrostatic panel (28" tall, substantial radiating area) implies outstanding midrange clarity, natural timbre and strong vocal presence typical of MartinLogan electrostats. The listed quality components (custom-wound transformer, metal-film caps) further support clean, detailed midrange reproduction with low distortion.
Treble
94/100
Electrostatic high-frequency transducers are known for exceptional extension, low distortion and airy top-end; the EFX's CLS electrostatic panel and wide radiating area indicate very refined, detailed treble with ample air. The 68 Hz–22 kHz spec (±3 dB) also supports strong HF extension.
Soundstage Imaging
94/100
A tall line-source electrostatic panel provides excellent vertical dispersion and a highly coherent, stable image with wide perceived soundstage. The specified narrow horizontal dispersion (30°) plus long-panel radiating area suggest precise imaging and exceptional depth/height for its form factor.
Dynamics
90/100
High sensitivity (90 dB) and broad recommended amp power (20–300 W) indicate the EFX can deliver strong micro- and macro-dynamics with good headroom when paired with an appropriate amplifier. The hybrid design (fast electrostatic panel and high-excursion woofer) favors transient speed and punch for a bookshelf.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
92/100
Specified components (custom-wound E-I core transformer, air-core coils, metal-film caps), substantial cabinet weight (24.5 lbs) and dedicated electrostatic panel construction point to high-quality engineering and craftsmanship. The product appears well-appointed and robust for its class.
Features Connectivity
80/100
Passive bookshelf baseline applied: custom 5-way binding posts provided. No active DSP/streaming expected or required; score reflects standard passive connectivity for this category.
Value for Money
85/100
At $4,399.98 the EFX sits in the premium bookshelf bracket. Given the hybrid electrostatic panel, high-quality components and likely exceptional imaging/treble performance, it represents strong value for buyers seeking electrostatic-level clarity in a compact footprint, though the price is high relative to conventional bookshelf alternatives.
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Specifications
- Frequency Response
- 68–22,000 Hz ±3dB
- Recommended Amplifier Power
- 20—300 watts per channel
- Horizontal Dispersion
- 30°
- Vertical Dispersion
- 28" (71cm) line source
- Sensitivity
- 90 dB/2.83 volts/meter
- Impedance
- 6 Ohms, 1.3 @ 20k Hz Compatible with 4, 6, or 8 Ohm rated amplifiers.
- Crossover Frequency
- 530Hz
- High Frequency Transducer
- XStat CLS electrostaic transducer Panel Dimensions: 28" x 8.6" (71 x 22cm) Radiating Area: 241 in² (1,562 cm² )
- Low Frequency Transducer
- 6.5" (16.5cm) high excursion, fiber cone with extended throw drive assembly; bass reflex
- Components
- Custom-wound E-I core transformer, air core coils, metal film capacitors
- Inputs
- Custom 5-way binding posts
- Power Draw
- Max: 2W each Standby: <1W each
- Weight
- 24.5 lbs. (11.1 kg)
- Dimensions
- 48.8" x 9.4" x 6.5 " (123.9cm x 23.8cm x 16.5cm)
Manufacturer's Description — MartinLogan
Electrostatic On-Wall
Get off the floor and on the wall with the EFX electrostatic on-wall speaker. This versatile on-wall electrostat is the perfect surround speaker for any MartinLogan home theater system.
Surround Yourself with EFX
MartinLogan is proud to introduce the slim, on-wall EFX™ hybrid electrostatic loudspeaker, featuring XStat™ technology, dramatically reducing cabinet size, yet establishing new standards for efficiency, dynamics and precision.
CLS™ XStat Transducer
Housed within a radical, ultra-ridged extruded aluminum AirFrame™, the EFX's new CLS XStat transducer builds upon the legacy of MartinLogan's electrostatic heritage with the incorporation of advanced vacuum bonding and MicroPerf stat panels, providing even greater efficiency and precision.
Slim On-Wall Profile
If you won't settle for anything but electrostats next to your new flatscreen TV, the EFX is the perfect solution at just 6.5-inches deep. Free up precious floorspace by mounting EFX to your wall with the included wall brackets. The EFX is also the ultimate high-performance home theater surround speaker and complements MartinLogan's entire line of electrostatic loudspeakers. EFX rotates with the pivoting wall bracket to easily focus your surround sound experience.
Advanced Vojtko Filtering
Proprietary Vojtko filtering technology is utilized for EFX's electrostatic transducer. This audiophile quality network, derived from the CLX, is carefully hand-built using precision point-to-point wiring, polypropylene capacitors, massive air-core coils, and a custom wound E-I core transformer—flawlessly preserving micro-acoustic subtleties while effortlessly handling the broadest range of dynamics contained within even the most demanding sonic source.
Custom 5-Way Binding Posts and Low-Voltage Power Supply
MartinLogan's proprietary tool-less binding posts simplify cable connection and management. EFX features custom 5-way binding posts and provide the ultimate level of flexibility for connection and setup. To further simplify setup and cable management, the EFX features a low-voltage DC power supply eliminates the need for a traditional, heavy IEC power cord.
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Authorized dealers for MartinLogan EFX
- Abt Electronics — online and in-store — Glenview, Illinois, United States (website)
- Acoustic Sounds — online and in-store — Salina, Kansas, United States (website)
- Alpha High End — online and in-store — Brasschaat, Vlaams Gewest, Belgium (website)
- Alta Fedelta — online and in-store — Lombardia, Italy (website)
- AMPL’HIFI — online and in-store — Nîmes, Occitanie, France (website)
- Analogue Seduction — online and in-store — Whittlesey, England, United Kingdom (website)
- Anointed Soundz — in-store — Cedar Hill, Texas, United States (website)
- Apollo HiFi — online and in-store — Marrickville, New South Wales, Australia (website)
- Area Hifi — online and in-store — L'Eixample, Comunidad Valenciana, Spain (website)
- Audible Elegance — online and in-store — Cincinnati, Ohio, United States (website)
and 142 more verified dealers