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MartinLogan Motion 15i - A Top-Notch Tweeter

Updated: Jan 25, 2023

The motion 15i bookshelf speakers are superior in sound with a top-notch Folded Motion™ tweeter.

The MartinLogan brand was founded by a couple of guys with almost nothing in common except their love of high-end audio. Back in the '70's they seized the opportunity to build an electrostatic speaker that overcame the limitations of contemporary offerings. Fast forward a few decades and they now have one of the world’s most recognized electrostatic loudspeakers under their brand name. Today the mission of MartinLogan is to use their unique and astonishing technology to render the most complex musical passages as faithfully to the original source as possible. Their 'no compromise' philosophy gives the Motion Series a unique sound you won't find anywhere else. The emotionally engaging sound rivals (and most times trounces) traditional loudspeakers. The Motion 15i bookshelf speaker certainly stays on track with the mission of MartinLogan. The Motion 15i delivers a classic broad soundstage of the Motion Series from a newly designed enclosure. The speaker is enhanced by the slightest of modifications, including the drive-stabilizing dust cap design and stiffened motor suspension. The Motion 15i provides such incredible detail and clarity that it makes these speakers easy to listen to for hours on end, without a hint of listener fatigue. A fine fit for any musical genre, whether you love classics of Beethoven, the twang of country or the amplified instrumentals of rock'n'roll, the Motions 15i has you covered. The sound will undoubtedly reach your ear with no effort whatsoever, all the while retaining bass precision and power. This stylish and high-quality bookshelf speaker is a sleek addition to any credenza or media cabinet. Weighing only 12 pounds and standing 9.5 inches tall you never have to sacrifice space for quality sound when it comes to the Motion 15i.


5.25” (13.3cm) aluminum cone with cast basket. Non-resonant asymmetrical chamber format. Rigid structured dust cap to reduce cone break-up modes.

HIGH FREQUENCY TRANSDUCER 1" × 1.4" (2.6cm × 3.6cm) Folded Motion Transducer with 5.25" × 1.75" (13.3cm × 4.4cm) diaphragm

PROPRIETARY VOJTKO™ CROSSOVER NETWORKS feature high-quality polypropylene and low-DF electrolytic capacitors, custom-wound inductors, and thermal and current protection for a seamless sonic presentation. Straightforward topologies and pragmatic, real-world voicing delivers reliable, realistic performance in any listening space.

ALUMINUM CONE DRIVERS Custom built, stiff, lightweight, low-distortion drivers with high-power magnet structures 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.

PERFORMANCE-ENHANCING ENCLOSURE TECHNOLOGY Reinforced baffles that virtually eliminate performance-robbing cabinet resonances. Elegant, understated styling complements flat-panel televisions and other high-end components. Motion 60XTi and 50XTi feature additional interior bracing.

COMPONENTS Custom air core coil and low DCR steel laminate inductors. Polypropylene film capacitors in series and low DF electrolytic capacitors in parallel. Overall system thermal/current protection.

FOLDED MOTION™ TWEETERS offer superior realism and alarming specificity—a unique sound you won’t find anywhere else.

IMPEDANCE 5 Ohms Compatible with 4, 6, or 8 Ohm rated amplifiers.

DIMENSIONS 11.4" x 6.8" x 9.5 " (29cm x 17.3cm x 24cm)

WEIGHT 12 lbs. (5.4 kg)

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