About the MartinLogan Motion® 4
Elegant looks, effortless detail
Elegant looks, effortless detail
MartinLogan's Motion series speakers are known for sound that's realistic and immediate without being overbearing or harsh. The Motion 4 bookshelf speaker provides smooth, musical highs, clear mids, and surprisingly rich bass in a compact, elegant-looking package. Equipped with an included wall-mount bracket, this speaker works great in a wide range of applications. Use a pair for stereo music in rooms where you don't want to sacrifice floor space. Or use four of these satellites for your front and rear channels in a high-performance surround sound system.
Folded Motion™ tweeter for detailed sound
The Motion 4 uses MartinLogan's acclaimed Folded Motion tweeter for smooth, effortless highs.
The distinctive sound of the Motion series starts with MartinLogan's Folded Motion tweeter. Rather than a dome or cone driver, this tweeter uses a pleated diaphragm that works like an accordion by "squeezing" air to create sound. It requires about 90% less excursion than a typical 1" dome tweeter, resulting in quicker response time and much lower distortion. The tweeter's controlled sound dispersion creates a focused soundstage with a real sense of presence. Music sounds amazingly detailed, but smooth and effortless, without a trace of harshness.
A stylish, curved cabinet with a unique folded port
Cutaway view of the folded bass port
The tweeter is coupled here with a 4" doped paper cone woofer that supplies accurate mids and lows. The Motion 4's eye-catching curved cabinet is finished in your choice of high-gloss white or piano black, and it hides a unique folded bass port that helps reinforce the low frequencies and improve sensitivity. This speaker's subtle, modern lines complement just about any décor. If you're mounting it high up on your wall, you can invert it to aim the high frequencies downward toward your listening position.
Be sure you get enough bass
For even better bass — and especially for high-impact home theater — we recommend a powered subwoofer, like one of MartinLogan's excellent models.
- elegantly curved cabinet with high-gloss black or white finish
- 1" x 1.4" Folded Motion tweeter
- 4" paper cone woofer with rigid dust cap
- frequency response 70-25,000 Hz (±3dB)
- handles up to 150 watts
- sensitivity: 90 dB
- impedance: 4 ohms
- bass reflex cabinet with folded port for improved low-frequency extension
- perforated metal grille
- custom-designed push-style binding posts accept pins, banana connectors, or bare wire
- includes wall mount bracket
- 5-5/8"W x 12-5/8"H x 5-1/4"D
- weight: 6 lbs.
- warranty: 5 years (with product registration)
- Our 60-day money-back guarantee
- MFR # MO4BL
What's in the box:
- Bookshelf loudspeaker
- MartingLogan logo badge (installed)
- Wall-bracket spacer
- Two 1.5" screws
- 2 Drywall anchors
- 1/4"-20 Shoulder bolt
- 4 Self-adhesive rubber pads
- Cleaning cloth
- User's Manual (En/Fr)
- Installation template
- Product Registration Card
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More details on the MartinLogan Motion® 4
Features & specs
|Tweeter Type||Folded Motion Transducer|
|Tweeter Size (inches)||1 x 1.4|
|Midrange Size (inches)||N/A|
|Woofer Size (inches)||4|
|Frequency Response||70-25k Hz|
|Connector Type||Spring post|
|Recommended Stand Height (inches)||26-31|
|Parts Warranty||5 Yrs w/ Registration|
|Labor Warranty||5 Yrs w/ Registration|
Folded Motion Tweeter: MartinLogan's Folded Motion Tweeter helps give the Motion 4 bookshelf loudspeaker its natural, realistic high frequency sound. Lightning fast transient response, combined with a large surface area (8x that of a typical 1" dome tweeter) creates clear, dynamic, and precise sound. The 1" x 1.4" Folded Motion Tweeter works by moving air (which creates sound) perpendicular to the folded ridges of the diaphragm, similar to how an accordion works. This extremely low mass diaphragm "squeezes" air and requires almost 90% less excursion than the typical 1" dome tweeter, which drastically minimizes distortion while providing a lightning fast response time. The increased surface area also provides a wide, yet controlled sound dispersion to create a realistic and carefully etched sound stage.
4" Paper Cone Woofer: The MartinLogan Motion 4 loudspeaker features a 4" paper cone woofer with a stamped steel basket housed in a non-resonant asymmetrical chamber. The paper cone woofer uses a rigid structured dust cap to reduce cone break-up and distortion. This 4" cone woofer provides rich, detailed midbass.
Precision Crossover: To seamlessly blend the audio output from the high frequency driver (tweeter) and the midbass driver (woofer), the Motion 4 loudspeaker features a precision 2900Hz crossover utilizing custom air core coil and low DCR steel laminate inductors, polyester film capacitors in series, and low DF electrolytic capacitors in parallel.
Folded Reflex Port Technology: MartinLogan engineers were faced with a daunting task, create a compact speaker with low-end bass reproduction found in speakers much larger. After a myriad of prototypes, they created the Folded Motion Cascading Bass Port. This brilliant solution allows a long tuned port, which is folded over itself (think of a trombone's tuning arm) to be compacted and squeezed into the Motion 4 bookshelf loudspeaker. The result is amazingly detailed low bass that can play at high volumes with minimum distortion; all thanks to the elegantly simple cascading fold that slows down and controls the air motion of the bass waves. The Folded Motion Cascading Bass Port exits the rear-panel of the speaker cabinet.
Curved High-Gloss Black Cabinet: Complementing the Motion 4 loudspeaker's sonic accuracy is its elegant, yet understated styling. A high-gloss, piano black finish and subtle curves, along with MartinLogan's signature perforated grille, give the Motion 4 speaker an elegant and timeless look that will blend into almost any decor.
Spring-Post Connectors: The MartinLogan Motion 4 speaker features two spring-post connectors to attach your speaker wire. The spring-posts will accept bare wire (16- to 10-gauge), pin-connectors, and banana plugs (single only). The rubber caps on the spring-post connectors must be removed to use banana plugs.
Versatile Mounting Options: The MartinLogan Motion 4 bookshelf loudspeaker can simply be placed on a table-top, stand, shelf, or other flat surface. Four self-adhesive rubber feet are included for safe and secure placement. Using the included keyhole-slot bracket, you can wall-mount the speaker at two different angles. This means you can point sound directly toward the desired listening area for high or low wall mounting applications. In addition the Motion 4 is fitted with a 1/4"-20 threaded insert which allows you to hang the speaker on the wall using optional articulating wall-mount brackets (sold separately).
- If the Motion 4 is being mounted at approximately ear-level, the speaker should be oriented with the tweeter at the top. This will disperse sound directly towards the desired listening area.
- If the Motion 4 is be mounted above ear-level, the speaker should be oriented with the tweeter at the bottom. This will disperse the sound down at a 20° angle towards the listening area.
Note: The MartinLogan logo badge on the Motion 4's grille can be re-position based on how you have the speaker mounted.
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