Martin Logan 4i

Compact diffuser with curved shape, free-standing or wall-mounted positioning. 2-way, bass reflex.

Inspired by MartinLogan's ultra-high-end electrostatic loudspeakers, the Motion® Series was created to deliver extraordinary sound for your home theater or stereo. MartinLogan's dedicated in-house engineers carefully crafted the Motion Series to create an extremely affordable and compact product line that seamlessly blends our stunning Folded Motion® transducers with powerful, compact bass technology. The result is a smooth, refined sound with tremendous dynamic range and jaw-dropping clarity.

Motion 4i Compact Bookshelf Speakers

Audiophile performance without an audiophile price. Inspired by the clarity and detail of MartinLogan's high-end electrostatic loudspeakers, the Motion 4i features a folded motion tweeter, 4-inch paper cone woofer, and proprietary Vojtko crossover network in a compact, affordable package. Low frequencies are enhanced by a backlit Bass Reflex Cascading port, a unique long volume port that delivers astonishingly big bass from a remarkably compact speaker. Flexible installation options allow for tabletop or wall-mounted installation. The Motion 4i can also be mounted upside down for ease of positioning high on a wall. Available in glossy black.

What makes the Motion Series sound so amazing? MartinLogan's dedicated in-house design and engineering team began by using and perfecting the most advanced and compact technologies and combining them with innovative engineering and time-tested furniture construction techniques. The result is emotionally immersive sound that rivals (and more often than not fails) traditional speakers of similar size and price. Our "no compromise" philosophy gives the Motion Series a unique sound you won't find anywhere else.

Sound inspired by electrostatic speakers

The success of the Motion Series is directly attributed to its close relationship with MartinLogan's legendary high-end electrostatic loudspeakers. A desire to transform that level of performance into a more traditional speaker at a more affordable price point drove the initial design imperatives that created the Motion Series.

Folded Motion® tweeters The MartinLogan signature Folded Motion tweeter uses an extremely low mass diaphragm that "squeezes" the air, therefore 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 evanescent distortion. It's a marvel of sound engineering that can deliver much of the high-frequency detail and speed of a large dynamic electrostatic panel in a small space.

Vojtko ™ Crossover proprietary networks The Compact Motion Series loudspeakers feature proprietary Vojtko crossover networks using custom air core coil inductors, low DCR steel laminate inductors, polyester film, and low DF electrolytic capacitors for seamless sonic presentation.

Vojtko crossovers are named after MartinLogan's principal audio technologist, Joe Vojtko. His unique approach to crossover design is as integral to the "MartinLogan Sound" as are electrostatic and Folded Motion thin-film driver technologies. A Vojtko crossover is not so much a set of design requirements as a philosophy. Vojtko crossovers are designed in such a way that all drivers are kept in their optimum frequency range and balanced with each other. The drivers themselves are part of a Vojtko crossover as are capacitors and resistors. Before any crossover design begins, drivers are carefully selected or engineered to operate within a very intended frequency range and with precise and predictable performance parameters. Vojtko crossovers are always made with high quality parts and care is taken to avoid overly complex topologies, a simple goal thanks to the careful selection of woofers and tweeters. The final (and most critical) aspect of a Vojtko crossover is that the final entry 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-world rooms.

Modern curves and luxury finishes After honing the acoustic details, MartinLogan designers focused on an elegant yet understated style that complements flat-panel televisions and other high-end components. To achieve this, we gave the Motion compact shelf and center channel speakers a flawless gloss black finish and slim, compact enclosures. Subtle curves, along with MartinLogan's signature perforated grille, add to a timelessly elegant look.

Versatile placement: on a wall, shelf or stand

Not only do the curves of the Motion series of bookshelf speakers make up a great look, they also serve a purpose, allowing them to mount at two different angles with the included wall bracket. This means you can aim the sound directly at the desired listening area for high or low wall mounting applications. Motion 2i and 4i speakers do not need to be mounted. In fact, they look and sound great on speaker stands, or sitting next to the TV on a shelf.

     

Easy Hookups Comfortable, high-quality push-style binding posts are recessed into the speaker cabinet along with curved guides that allow cables to slide effortlessly into place. These binding posts are also designed to facilitate the use of banana plugs.

Cascade bass reflex port

MartinLogan engineers were faced with a daunting task: create a compact speaker with the low-end bass reproduction found in much, much larger speakers. After many sleepless nights and a myriad of prototypes, they created the Cascading Bass Reflex Port. This brilliant solution allows a long tuned door to be compacted and compressed in Motion 4i, which is folded back on itself (think of the tuning arm of a trombone). The result is incredibly detailed low bass that can play at high volumes with minimal distortion, all thanks to the elegantly simple waterfall bend that slows down and controls the air movement of the bass waves.