Agile, Fluid, Clear, and Fun: MartinLogan Motion 15i Bookshelf Loudspeakers Play with Attention-Getting Detail, Feature Trickle-Down Technology from Flagship Models
Music lovers, take note: Listeners all around the world are quickly discovering how much fun the MartinLogan Motion 15i bookshelf loudspeakers provide for a price as equally satisfying as the sound they produce. The secret weapon to such prowess is a proprietary Folded Motion ribbon tweeter that delivers the speed and accuracy difficult to achieve with a conventional tweeter. It is also able to move more rapidly and effectively than a typical dome or cone. As such, Motion 15i's wide dispersion capability and resultant immersive soundstaging fills spaces all the while avoiding the room reflections that often impact performance.
Afforded new enclosures with reinforced baffles that virtually eliminate cabinet resonances, Motion 15i's small 11 x 6.8 x 9.5-inch (HWD) footprint belies its ability to command immediate attention. The effortless grace with which it renders subtle high-frequency detail and foot-tapping midrange information will immediately catch your ear. Another reason for its well-balanced, natural presentation across the frequency spectrum relates to how well the ribbon tweeter integrates with the accompanying 5.25-inch aluminum cone driver. Housed in a non-resonant, asymmetric chamber, the driver, with an extremely rigid dust cap, drastically reduces cone break-up modes.
Further armed with an impressive 92dB efficiency rating, Motion 15i arrives fully compatible with four- and eight-ohm amplifiers rated between 20 and 200Wpc. Custom air-core coil and low DCR steel laminate inductors, polypropylene film capacitors, and low DF electrolytic capacitors found in MartinLogan's flagship models are here too. And whether you're system is driven by audiophile-grade tubes or a beefy solid-state home-theater behemoth, these speakers will have no trouble keeping pace. Finally, when you consider Motion 15i comes with MartinLogan's five-year warranty and our 100% Satisfaction Guarantee, only one question springs to mind: What are you waiting for?
"The ability of the 15i speakers to remain naturally open, spacious and airy in the midrange without the designers having to resort to hardware tricks, such as pinching and brightening to retain a focus and enhance detail, meant that the Motion 15i speakers sounded more expensive than they really were. The detail and clarity allowed a bucket load of information to reach the ear with no effort at all while bass precision and power was retained."
—Paul Rigby, The Audiophile Man
"Configured for surround sound use, the Motion speakers offer excellent performance that blend and integrate well with each other. The surround experience is satisfyingly seamless."
—Dylan Seeger, Home Theater Review, four-star review
"The Folded Motion tweeter has a similar, if somewhat smaller feel than a full ESL panel, and the aluminum cone woofer is uncolored, blending well with the tweeter — no small feat. In the end, the MartinLogan 15i is a small speaker that plays larger than its modest size suggests, and looks great doing it."
—Michael Laurance, TONEAudio
Engineering without Compromises
What makes Motion Series sound so amazing? MartinLogan's 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 most times trounces) traditional loudspeakers of similar size and price.
Sound Inspired by Electrostatic Speakers
The success of Motion Series is directly attributed to its close relation to MartinLogan's 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 Motion Series.
Folded Motion Tweeters
MartinLogan's signature Folded Motion tweeter utilizes an extremely low mass diaphragm that "squeezes" air, thus demanding significantly less excursion than the typical one-inch dome tweeter. Its folded design allows for a much larger surface area (compared to that of a regular one-inch dome tweeter), controlled dispersion characteristics, and vanishingly low distortion. It's a miracle of audio engineering that's 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 driver's 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).
Proprietary Vojtko Crossover Networks
Premium Motion Series speakers feature proprietary Vojtko crossover networks using polypropylene and low-DF electrolytic capacitors, custom-wound inductors, and thermal and current protection. Vojtko crossovers are named after MartinLogan's chief audio technologist, Joe Vojtko. His unique approach to crossover design is as big of a part of the "MartinLogan Sound" as are electrostatic and Folded Motion thin-film driver technologies. A Vojtko crossover isn't so much a set of design requirements as it is a philosophy. Vojtko crossovers are designed in such a way that all drivers are kept within their optimal frequency range and balanced with one another. The drivers themselves are as much a part of a Vojtko crossover as are capacitors and resistors. Before the design of any crossover begins, drivers are carefully selected or designed to operate within a very intentional frequency range and with precise and predictable performance parameters. Vojtko crossovers are always built from high-quality parts, and care is taken to avoid overly complex topologies — a straightforward objective due to the careful selection of woofers and tweeters. The final (and most critical) aspect of a Vojtko crossover is that final voicing is conducted in a space that is indicative of a real-world environment. This pragmatic approach allows MartinLogan speakers to sound their best in real-world rooms.
Modern Design Featuring Luxurious Finishes
Discreetly hidden behind fabric wrapped magnetic grilles, Folded Motion and aluminum cone drivers are held securely in place beneath matte black trim that masks tweeter and woofer mounting hardware for a clean, modern aesthetic. Solid cabinets, designed to eliminate fidelity robbing vibrations, are constructed from 18mm (0.7-inch) MDF with 31mm (1.2-inch) thick front baffles. MartinLogan's premier Motion Series speakers are available in three luxurious finishes and matching metallic trim — gloss black with black grilles and gunmetal grey trim, matte white with silver grilles and silver trim, and red walnut with black grilles and champagne colored trim.
Custom Five-Way Tool-Less Binding Posts
Premium gold-plated five-way tool-less binding posts assure a stable connection while accommodating bare wire, banana plug, spade lug, terminal pin, and (seldom used) alligator clip connections.
Recommended Amplifier Power: 20-200 watts per channel
Horizontal Dispersion: 80°
Vertical Dispersion: 80°
Sensitivity: 92 dB/2.83 volts/meter
Impedance: 5 Ohms Compatible with 4, 6, or 8 Ohm rated amplifiers.
Crossover Frequency: 2,700 Hz
High Frequency Transducer: 1" x 1.4" (2.6cm x 3.6cm) Folded Motion Transducer with 5.25" x 1.75" (13.3cm x 4.4cm) diaphragm
Low Frequency Transducer: 5.25” (13.3cm) aluminum cone with cast basket.
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.
Inputs: Custom 5-way tool-less binding posts
Weight: 12 lbs.
Dimensions: 11.4" x 6.8" x 9.5"
User Manual (PDF, 3.4 MB)