MartinLogan's signature Folded Motion Tweeter utilizes an extremely low-mass diaphragm that "squeezes" air, thus requiring significantly less excursion than the typical 1-inch dome tweeter. Its folded design allows for a much larger surface area (compared to that of a regular 1-inch dome tweeter), controlled dispersion characteristics, and vanishingly low distortion. It's a miracle of audio engineering that delivers much of the high-frequency detail, speed and response of a large, dynamic electrostatic panel in a small space. Folded Motion XT tweeters advance thin-film transducer technology even further with a 40% larger radiating surface and 80x30-degree controlled dispersion.

At a Glance

Model: MartinLogan Motion XTC8
Sold as: Single (price is each)
Available Finishes: White
Frequency Response: 51 - 25,000 Hz ±3dB
Tweeter Dispersion (horizontal x vertical): 30 x 80 degrees
Recommended Amplifier Power: Range 50–300 Watts
Sensitivity: 91dB @2.83V/ 1 meter
Impedance: 4 ohms. Compatible with 8 ohms
Crossover Frequency: 2,270 Hz

Key Features

The Sound of Invisibility: Folded Motion® Tweeters
MartinLogan's signature Folded Motion Tweeter utilizes an extremely low-mass diaphragm that "squeezes" air, thus requiring significantly less excursion than the typical 1-inch dome tweeter. Its folded design allows for a much larger surface area (compared to that of a regular 1-inch dome tweeter), controlled dispersion characteristics, and vanishingly low distortion. It's a miracle of audio engineering that delivers much of the high-frequency detail, speed and response of a large, dynamic electrostatic panel in a small space. Folded Motion XT tweeters advance thin-film transducer technology even further with a 40% larger radiating surface and 80x30-degree controlled dispersion.

Woven Kevlar Cones
All Motion XT CI speakers feature very lightweight woven Kevlar cones specifically engineered to keep pace with the lightning speed of our highest performance Folded Motion Tweeter XT. While these high-performance drivers offer both increased rigidity and lightness, we took an extra step by adding a special Nomex layer on the back side of the woofer material which increases clarity and realism by reducing resonance and ringing. This layer is not something you can see after installation, but it matters to the performance of the speaker, so it matters to us.

Spring-Loaded Binding Posts
With easy pre-installation access, our spring-loaded binding posts feature a large 4.5mm wire access hole and connect via banana plug, pin, or 12AWG bare wire.

Micro-Perforated Grilles
All MartinLogan architectural speakers feature an ultra-low profile, paintable, micro-perforated grilles with no visible bezel for a near-invisible integration into any wall or ceiling. A series of powerful magnets hidden inside the speaker quickly secure grilles into place, reducing the risk of warping or damage during installation. Optional square grilles are available for all current MartinLogan in-ceiling speakers.

Proprietary Vojtko™ Crossover Networks
Vojtko Crossovers are named after MartinLogan's chief audio technologist, Joe Vojtko. His unique approach to crossover design is just as crucial to MartinLogan's Truth in Sound as are our innovative electrostatic and Folded Motion thin-film driver technologies. A Vojtko Crossover isn't just a set of design requirements; it's a philosophy. Vojtko Crossovers are hand-built from the highest quality components and avoid overly complex topologies. This crossover has a straightforward objective: breathtaking realism.

Hand-Selected Components
In designing each crossover topology, we take the drivers themselves into consideration. Carefully selected drivers, engineered for specific performance characteristics, are kept within their optimal frequency range by the custom Vojtko Crossover. Each crossover is handcrafted using exceptional polypropylene and polyester capacitors, custom wound and large steel laminate low-DCR inductors, and double thick PCBs. This precision-tuned network preserves even the most microscopic sonic nuances while handling the full dynamics of any source. It's a recipe for vanishingly low distortion and seamless driver integration.

Optional Retrofit Enclosure
All Motion XT CI in-ceiling speakers have the option for a retrofittable back can or enclosure. This helps contain the sound coming off the back of the speaker to dramatically reduce unwanted sound that can travel through the floor and up into the living space above the speaker. For those desiring increased bass output, or for when sound control is not required, you can simply choose to use the speaker without the optional enclosure so it can take full advantage of the larger air volume provided by the space in the ceiling.

Frequency Response	51 - 25,000 Hz ±3dB
Tweeter Dispersion (horizontal x vertical)	30 x 80 degrees
Recommended Amplifier Power	Range 50–300 Watts
Sensitivity	91dB @2.83V/ 1 meter
Impedance	4 ohms. Compatible with 8 ohms
Crossover Frequency	2,270 Hz
High Frequency Driver	FMT Transducer 1.27” x 2.4” (3.22cm x 6.09cm) Opening 4.5” x 2.75” (11.43cm x 6.98cm) Diaphragm
Crossover Type	2 way
Driver Configuration	1 x 1.27” x 2.75” FMT, 1 x 8” Woofers
Woofer Specifications	One 8” (20.32 cm) cast aluminum basket, black Kevlar with Nomex backer cone, Open back chamber format. Concave dust cap.
Cabinet Material	Black w/ White Paintable Grill
Connector	Push style
Components	Custom air core coil inductors, polypropylene film capacitors in series and low DF electrolytic capacitors FMT thermal/current protection.
Max Power Handling	150 Watts
Weight	7.9 lbs. (3.6 kg) each
Dimensions (overall size)	10.35” x 5.30” (26.30 x 13.46cm)
Required Wall Opening (includes tolerance)	9.25” (23.5cm) diameter
Projection From Wall Surface	0.33” (23.5cm)
Depth Behind Wall Surface	5.50” (13.97cm)