MartinLogan Motion 40i Floorstanding Speaker Pair Gloss Black

Motion 40i Floorstanding Speakers

The secret to the Motion 40i's exceptional performance lies in the Folded Motion® tweeter, 5.5-inch aluminum cone midrange driver, dual 6.5-inch aluminum cone woofers with a rear-firing bass port, and a proprietary Vojtko crossover network. This dual woofer design produces deep, vibrant, and accurate bass performance. Motion 40i delivers the Motion Series' classic wide soundstage from a newly designed enclosure enhanced with minimal modifications, including a drive-stabilizing dust cap design, stiffened motor suspension, and low-mounted woofers to reduce an acoustically damaging phenomenon known as floor bounce. The speaker enclosure sports a reinforced baffle and fabric grille. Available in three elegant finishes: gloss black, matte white, and red walnut.

No-compromise engineering

What makes Motion Series sound so amazing? MartinLogan's dedicated in-house design and engineering team began by utilizing and refining the most advanced, compact technologies and combining them with innovative design techniques and proven cabinet construction. The result is emotionally engaging sound that rivals (and more often than not defeats) traditional loudspeakers of similar size and price. Our “no-compromise” philosophy gives Motion Series a unique sound you won't find anywhere else.

Sound inspired by electrostatic loudspeakers

The success of the Motion Series is directly attributed to its close relationship 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 accessible price point drove the initial design imperatives that created the Motion Series.

Folded Motion ® Tweeter

MartinLogan's signature Folded Motion tweeter uses an extremely low-mass diaphragm that "squeezes" air, 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 typical 1-inch dome tweeter), controlled dispersion characteristics, and incredibly low distortion. It's a marvel of audio engineering, delivering much of the high-frequency detail and speed of a large dynamic electrostatic panel in a small space.

Powerful Aluminum Cone Midrange and Bass Drivers

Custom-designed, low-distortion drivers pair high-powered magnet structures with conical aluminum diaphragms to deliver massive excursion and audio output, preserve fine bass detail, and maximize power handling capacity—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 the cones maximizes the rigidity and strength of the drivers without adding excessive weight. This, combined with the exceptional damping properties of aluminum, provides the smooth, non-resonant response needed for seamless blending with the high-resolution Folded Motion tweeters. An additional benefit of aluminum is its exceptional thermal conduction, allowing the cones to act as efficient heat sinks for the voice coils.

To ensure accuracy in the critical midrange, the mid-frequency drivers feature a specially designed “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 mid-frequency reproduction (as opposed to a comparably sized woofer).

Low-mounted woofers minimize floor bounce

The floorstanding Motion models utilize specially engineered designs that feature woofers positioned low in the cabinet and close to the floor. This deliberate design addresses a phenomenon known as floor bounce, where sound reflected off the floor (from drivers positioned high in a cabinet) and those aimed directly at the listener interfere with each other. Without addressing these issues, listeners would experience bloated bass and massive increases and decreases in sound levels throughout the critical midrange frequencies. Through careful crossover design and driver placement, Motion floorstanding speakers deliver a flat, balanced response in the bass and midrange regions. Such considerations are crucial when attempting to achieve accurate reproduction of vocals and instruments such as kick drums.

Proprietary Vojtko™ Crossover Networks

Premium Motion Series speakers feature proprietary Vojtko crossover networks utilizing premium polypropylene and low-DF electrolytic capacitors, custom-wound inductors, and thermal and current protection.

Vojtko crossovers are named after MartinLogan's chief audio engineer, Joe Vojtko. His unique approach to crossover design is as big a part of the "MartinLogan Sound" as the company's electrostatic thin-film and Folded Motion driver technologies. A Vojtko crossover is less a set of design requirements than a philosophy. Vojtko crossovers are designed so that all drivers are kept within their optimal frequency range and balanced with each other. The drivers themselves are as much a part of a Vojtko crossover as the capacitors and resistors. Before designing any crossover begins, the drivers are carefully selected or designed to operate within a very intentional frequency range and with precise, predictable performance parameters. Vojtko crossovers are always built with high-quality parts, and care is taken to avoid overly complex topologies, a simple goal due to the careful selection of woofers and tweeters. The final (and most critical) aspect of a Vojtko crossover is that the final soundstage is conducted in a space that is indicative of a real-world environment. This pragmatic approach allows MartinLogan loudspeakers to sound their best in real rooms.

Modern design with luxurious finishes

Discreetly hidden behind fabric-wrapped magnetic grilles, the Folded Motion and aluminum cone drivers are held firmly in place beneath a matte black finish that masks the tweeter and woofer mounting hardware for a clean, modern aesthetic. The solid cabinets, designed to eliminate fidelity-compromising vibrations, are constructed from 18 mm (0.7-inch) MDF with 31 mm (1.2-inch) thick front baffles. The Motion 60XTi and 50XTi feature additional internal bracing to further reduce cabinet resonance.

MartinLogan's top-of-the-line Motion Series loudspeakers are available in three luxurious finishes and matching metallic finishes: gloss black with black grilles and gunmetal gray trim, matte white with silver grilles and trim, and red walnut with black grilles and champagne trim.

Custom 5-Way Tool-Free Binding Posts

High-quality, tool-free, gold-plated 5-way binding posts ensure a solid connection and accommodate a wide range of connections.

Two sets of binding posts allow bi-wire connections to increase signal-carrying conductors and allow each portion of the crossover to be coupled directly to the amplifier.

SPECIFICATIONS

Frequency Response: 40–25,000 Hz ± 3dB

Recommended amplifier power: 20—300 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 amplifiers

Crossover frequency: 500 and 2,600 Hz

High-frequency transducer: 2.6 x 3.6 cm folded motion transducer with 13.3 x 4.4 cm diaphragm

Mid-frequency transducer: 14 cm aluminum cone in a non-resonant asymmetrical chamber format. Cast polymer basket. Rigid structured dust cap reduces cone breakup

Low Frequency Transducer: Two 6.5" aluminum cone woofers in a non-resonant asymmetrical chamber format. Cast polymer basket. Rigid structured dust caps reduce cone breakup

Components: Precision Vojtko™ custom air coil and low DCR steel laminate inductors. Polyester film capacitors in series and low DF electrolytic capacitors in parallel

Inputs: Tool-less 5-way custom binding posts

Weight: 48 lbs.

Dimensions: 42" x 7.5" x 12.8"