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MartinLogan Motion® 4i

Bookshelf speaker with wall-mount bracket

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Item # 839MO4IB

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Overview

Product Highlights:

  • elegantly curved cabinet with high-gloss piano black finish
  • 1" x 1.4" Folded Motion tweeter
  • 4" poly cone woofer with rigid dust cap
  • frequency response: 70-23,000 Hz (±3dB)
  • recommended amplifier power: 20-150 watts
  • sensitivity: 90 dB
  • impedance: 4 ohms
  • ported design with folded bass reflex port
  • 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 5-3/4"D
  • weight: 6 lbs.
  • warranty: 5 years (with product registration)
  • Our 60-day money-back guarantee

What's in the Box:

  • Bookshelf loudspeaker
  • Grille
  • Two-piece wall-bracket
  • 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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Details

Hands-on research

Features and Specs

Enclosure Bass Reflex
Video Shielded No
Tweeter Type Folded Motion
Tweeter Size (inches) 1 x 1.4
Midrange Size (inches) N/A
Woofer Size (inches) 4
Woofer Composition Poly
Woofer Surround Rubber
Power Range 20-100
Sensitivity 90 dB
Impedance (Ohms) 4
Frequency Response 70-23k Hz
Connector Type Spring post
Bi-amp Inputs No
Height (inches) 12-11/16
Width (inches) 5-11/16
Depth (inches) 5-11/16
Weight (pounds) 6
Mounting Bracket Included Yes
Recommended Stand Height (inches) 28-31
Parts Warranty 5 Yrs w/ Registration
Labor Warranty 5 Yrs w/ Registration

Product Research

Features

Folded Motion Tweeter: MartinLogan's Folded Motion Tweeter helps give the 4i 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 (80°x80°) to create a realistic and carefully etched sound stage.

4" Poly Cone Woofer: The MartinLogan 4i loudspeaker features a 4" poly cone woofer with a stamped steel basket housed in a non-resonant asymmetrical chamber. The poly cone woofer uses a rigid structured dust cap to reduce cone break-up and distortion. This 4" cone woofer provides rich, detailed midbass.

Precision Vojtko Crossover: To seamlessly blend the audio output from the high frequency driver (tweeter) and the midbass driver (woofer), the 4i loudspeaker features a precision Vojtko crossover (2900Hz) 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 4i 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. The grille is magnetic and detachable.

Spring-Post Connectors: The MartinLogan 4i 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).

Versatile Mounting Options: The MartinLogan 4i 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 4i 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 4i 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 4i 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.

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Q & A

Customer Q&A

1 question already asked

The modern TV isn't affected by speakers. However, if you have a Plasma or a CRT TV, then you should not use these speakers next to it. They are not video shielded. I recommend calling an advisor on 1-800-324-9695 for a personal recommendation on speakers that work with those 2 types of TV's. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=101 [ Paul  Sep 18, 2017 ]  Staff
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