Martin Logan Motion 15i

Stunning Dynamic Range and Clarity Martin Logans high-performance Motion 15i bookshelf speaker features a Folded Motion® tweeter, a 5.25" aluminum cone woofer with a rear-firing bass port, and a proprietary Vojtko crossover network to deliver refined sound with stunning dynamic range and jaw-dropping clarity. Motion 15i delivers the classic broad soundstage of the Motion

Series from a newly designed enclosure enhanced by the slightest of modifications, including the drive-stabilizing dust cap design and stiffened motor suspension. The speaker’s cabinet sports a reinforced baffle and a fabric grille. Available in three stylish finishes: gloss black, matte white, and red walnut.

"Beautiful, thoughtfully designed speakers with a sound that begs you to plant yourself on the couch and watch movies for hours on end," notesin a September 30, 2019 review of a multi-channel system using Motion 40i, 30i, and 15i speakers. "These are high-performance and designed to deliver refined sound with stunning dynamic range and ‘jaw-dropping’ clarity."

Engineering, Without Compromises

What makes the Motion Series sound so amazing? Martin Logans dedicated in-house engineering and design team started by utilizing and refining the most advanced, compact technologies and combining them with innovative engineering and time-honored cabinet construction techniques. The result is an emotionally engaging sound that rivals (and often trounces) traditional loudspeakers of similar size and price. Martin Logans no compromise philosophy gives Motion Series a unique sound you wont find anywhere else.

Sound Inspired by Electrostatic Speakers

The success of the Motion Series is directly attributed to its close relation to Martin Logans legendary ultra-high-end electrostatic loudspeakers. The desire to transmute that level of performance into a more traditional loudspeaker at a more affordable price drove the initial design imperatives that created the Motion Series.

Folded Motion® Tweeters

Martin Logans signature Folded Motion tweeter utilizes an extremely low mass diaphragm that "squeezes" air, thus demanding 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" dome tweeter), controlled dispersion characteristics, and vanishingly low distortion. Its a miracle of audio engineering thats able to deliver much of the high-frequency detail and speed of a large, dynamic electrostatic panel in a small space.

Powerful Aluminum Cone Mid-Frequency and Bass Drivers

Custom built, low-distortion drivers pair high-power magnet structures with aluminum cone diaphragms to deliver massive excursion and sound output, preserve minute bass details, and maximize power handling capability, all without a hint of distortion. A unique concave dust cap design reinforces the strength and rigidity of the cone while reducing break up modes. The use of aluminum for cones maximizes rigidity and strength of the drivers without adding excessive weight. This, along with the exceptional damping properties of aluminum, ensures the smooth, non-resonant response necessary for seamless blending with high-resolution Folded Motion tweeters. An added benefit of aluminum is its outstanding thermal conduction capability which allows cones to serve as efficient heat sinks for voice coils.

To deliver accuracy in the critical midrange, mid-frequency drivers feature a specially engineered "stiff" suspension. Stiffening the suspension (the spider and surround) raises the drivers resonant frequency and optimizes its performance to achieve a natural roll-off and inherently operate within an ideal range for a mid-frequency reproduction (as opposed to a comparably sized woofer).


Specification

Frequency Response: 60–25,000 Hz ±3dB

Recommended Amplifier Power: 20-200 watts per channel

Horizontal Dispersion: 80°

Vertical Dispersion: 80°

Sensitivity: 92 dB/2.83 volts/meter

Impedance: 4 Ohms Compatible with 4, 6, or 8 Ohm rated amplifiers.

Crossover Frequency: 2,700 Hz

Dimensions: 11.4" x 6.8" x 9.5" (28.95 X 17.27 X 24.13 CM)

Weight: 12 lbs. (5.44 Kg)