MartinLogan Black Floorstanding Speaker - MO20GBL

Abt Model: MO20GBK | UPC: 877929007164
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Estimated Delivery Date: Jan 22nd*
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MartinLogan Motion 20 Black Floorstanding Speaker, Model MO20GBK (Sold As Each)

The Motion 20 is a breathtaking visual statement regardless of its compact dimensions. Dual 5-1/2” aluminum-cone woofers are paired with a rear-firing bass port for extra punch in the low frequencies. With the addition of our exquisite Folded Motion™ tweeter it’s a design that delivers solid low-frequency reinforcement, superb sound dispersion and precise, highly dynamic high frequencies. Sitting on top included MiniETC™ Spikes, this combination creates audible acoustic alchemy across the frequency spectrum and offers an extremely expansive soundstage, richly detailed highs, and an open & revealing midrange.


  • This is one sweet tweeter
    The 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.
  • Engineering Genius
    What makes the Motion Series sound so amazing? MartinLogan's dedicated in-house engineering team started by utilizing and refining the most advanced, compact technologies and combining them with innovative engineering. The result is an emotionally engaging sound that rivals (and most times trounces) traditional loudspeakers of similar size and price. Although our engineers won't reveal exactly how they make the sausage, here are a few technologies that help give MartinLogan Motion Series such a unique sound.
  • A Versatile Performer
    Each model feature dual sets of custom 5-way binding posts for bi-wire/bi-amp capabilities and powerful rear-firing bass port. Stability is enhanced to create tighter coupling between speaker and floor with the included spikes.


  • Frequency Response: 46–25,000 Hz ± 3 dB
  • Dispersion: 80° x 80°
  • High Frequency Driver
    • 1” x 1.4” (2.6cm x 3.6cm) Folded Motion Transducer
    • 5.25” x 1.75” (13.3cm x 4.4cm) diaphragm.
  • Mid Frequency Transducer:
    • Two 5-1/2” (14cm) aluminum cone woofers in a non-resonant asymmetrical chamber format
    • Cast polymer basket. Rigid structured dust caps reduce cone break-up
  • Low Frequency Transducer:
    • Two 6-1/2” (16.5cm) aluminum cone woofers in a non-resonant asymmetrical chamber format
    • Cast polymer basket. Rigid structured dust caps reduce cone break-up
  • Sensitivity: 90 dB @ 2.83 volts/meter
  • Impedance: 4 Ohms. Compatible with 4, 6, or 8 Ohm rated amplifiers.
  • Recommended Amplifier Power: 20 – 200 watts
  • Crossover Frequency: 500 & 2,600 Hz
  • Cabinet: Ported
  • Components:Precision Vojtko™ with custom air core coil and low DCR steel laminate inductors. Polyester film capacitors in series and low DF electrolytic capacitors in parallel
  • Inputs: Custom 5-way bi-wire tool-less binding posts

Approximate Dimensions:

  • Height: 36.6"
  • Width: 6.8"
  • Depth: 11.7"

Approximate Weight:

  • Unit: 37 lbs (each)
  • Shipping: 50 lbs

Warranty Information:

  • Manufacturer Warranty (authorized online retailer): 5 Year Limited Warranty
California customers: Proposition 65 WARNING - learn more
Key Features
Sold As Each/ Folded Motion Tweeter/ 500 And 2,600 Hz Crossover Frequency/ Precision Vojtko With Custom Air Core Coil/ Low DCR Steel Laminate Inductors/ 46 - 25,000 Hz 3 dB Frequency Response/ Custom 5-Way Bi-Wire Tool-Less Binding Posts/ Black Finish
More reasons to buy the MartinLogan MO20GBL from Abt Electronics
  • is an authorized dealer (Learn More).
  • The MartinLogan MO20GBL is Brand New.
  • The MartinLogan MO20GBL Ships in a Factory Sealed Box.
ConnectivityBinding Posts
Frequency Response46Hz - 25kHz +/-3dB
Enclosure TypeBass Reflex (Ported)
Magnetic ShieldingNo
Midrange Size (inches)5.5
Sensitivity90dB @ 2.83 volts/meter
Speaker Design3-Way
Speaker TypeFloorstanding
Tweeter Size (inches)1 x 1.4
Woofer Size (inches)6.5
Height (inches)36.6
Width (inches)6.8
Depth (inches)11.7


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