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Martin Logan Motion 4 Black Bookshelf Speaker - MO4BL

Abt Model: MO4BL | UPC Code: 877929005368
Regular Price $249.00
SAVE $75.00
through 04/16/2017
Sold As Each/ 70-25,000 Hz ±3dB Frequency Response/ 90 dB/2.83 volts/meter Sensitivity/ 4 Ohms Impedance/ 2900 Hz Crossover Frequency/ 1 x 1.4 Inch Folded Motion Transducer High Frequency Driver/ 75 Watts Power Handling/ Black Finish
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Product Details

MO4BL - Martin Logan Motion 4 Glossy Black Compact Bookshelf Speaker (Sold As Each)

Audiophile Performance without an audiophile price

Inspired by the clarity and detail of our ultra-high-end electrostatic loudspeakers, Motion 4 features an exquisite Folded Motion™ tweeter and powerful bass technology in a compact and affordable package. Key to Motion 4’s performance is the lightning fast response of the tweeter’s light-weight diaphragm combined with a large surface area (8-times that of a typical one-inch dome tweeter) which together achieve a smooth, refined sound with stunning dynamic range and jaw-dropping clarity—certain to inspire envy in audiophiles and non-audiophiles alike.


  • Folded Motion™ tweeter
  • 4-inch woofer. Paper cone doped for stability and damping. Rigid dust cap. • Folded bass reflex port
  • Precision Vojtko™ crossover with custom air core coil and low DCR steel laminate inductors, and polyester film and low DF electrolytic capacitors
  • Bookshelf or on-wall installation
  • Convenient push-style binding posts easily adapt to accept banana plugs.


  • Frequency Response 70–25,000 Hz ± 3dB
  • Sensitivity 90 dB/2.83 volts/meter
  • Nominal Impedance 4 ohms. Compatible with 4, 6 or 8 ohm rated amplifiers
  • Crossover Frequency 2900 Hz
  • High Frequency Driver 1 x 1.4” (2.6 x 3.6cm) Folded Motion Transducer with 5.25 x 1.75” (13.3 x 4.4cm) diaphragm.
  • Mid/Low Frequency Drivers 4” (10.2cm) poly cone.
  • Power Handling 75 watts

Approximate Weight:

  • Unit: 6 lbs
  • Shipping: 7 lbs

Approximate Dimensions:

  • Depth: 5.25"
  • Height: 12.6"
  • Width: 5.6"

Warranty Information:

  • Manufacturer Warranty (authorized online retailer): 5 Year Limited Warranty
Downloadable Resources Get Adobe Reader
More reasons to buy the MartinLogan MO4BL from Abt Electronics
  • is an authorized dealer (Learn More).
  • The MartinLogan MO4BL is Brand New.
  • The MartinLogan MO4BL Ships in a Factory Sealed Box.
  • Abt ships this product for free!
Frequency Response70Hz - 25kHz +/- 3dB
Enclosure MaterialWood
Enclosure TypeBass Reflex (Ported)
Impedance4 Ohms
Magnetic shieldingNo
Sensitivity90dB spl (2.83 V/m)
Speaker Design2-Way
Speaker TypeBookshelf
Tweeter Size (inches)1 x 1.4
Woofer Size (inches)4
Height (inches)12.6
Width (inches)5.6
Depth (inches)5.25


by PowerReviews
MartinLoganMartin Logan Motion 4 Black Bookshelf Speaker

(based on 1 review)

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Reviewed by 1 customer

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(2 of 2 customers found this review helpful)


Great front and rear speakers


from Libertyville, IL

About Me Midrange Shopper

Verified Buyer


  • Clear Sound
  • Sturdy


    Best Uses

    • Family Room
    • Front Rightleft Speaker
    • Rear Rightleft Speaker

    Comments about Martin Logan Motion 4 Black Bookshelf Speaker:

    I was replacing my 17 year old Kef speakers and Martin Logan was recommended to me by Abt. I am using these speakers in a 5.1 speaker setup as the front right and left and rear right and left speakers. They have very clear and discrete sound, very enjoyable under dolby digital. The spring loaded clips to hold the speaker wire are very strong and worked very well. Using these with a Martin Logan Center Channel and a Denon receiver.

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    Martin Logan Motion 4 Black Bookshelf Speaker

    Martin Logan Motion 4 Black Bookshelf Speaker

    In Stock

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