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MartinLogan Motion F20 Floor-standing speaker (Gloss Black)

Item # 839MF20GB

This impressive tower speaker can star in a two-channel stereo system or anchor a full home theater setup.

This impressive tower speaker can star in a two-channel stereo system or anchor a full home theater setup.

2 questions - 2 answers

Item # 839MF20GB

Low stock
$1,749.99 -$87.50 Outlet savings
$1,662.49 each

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About the MartinLogan Motion F20

Eric A.

A robust MartinLogan tower speaker

The MartinLogan Motion F20 is the top of the impressive Motion Series lineup. It's a robust floor-standing speaker that delivers accurate, detailed sound, based around carefully chosen drivers, precise crossovers, and an acoustically optimized cabinet. This tower is voice-matched to other models in the Motion Series, and it comes in three gorgeous finishes, so you can choose one that suits your home decor.

A robust MartinLogan tower speaker

The MartinLogan Motion F20 is the top of the impressive Motion Series lineup. It's a robust floor-standing speaker that delivers accurate, detailed sound, based around carefully chosen drivers, precise crossovers, and an acoustically optimized cabinet. This tower is voice-matched to other models in the Motion Series, and it comes in three gorgeous finishes, so you can choose one that suits your home decor.

Impressive Motion® tweeter

MartinLogan's acclaimed Folded Motion tweeter uses a pleated diaphragm that works similarly to an accordion by "squeezing" air to create sound. The F20's upgraded Gen2 Obsidian version of this tweeter uses larger magnets for greater detail and accuracy. The new design places it inside a custom Folded Motion waveguide that enhances dispersion of high-frequency sound throughout your listening area. 

Because it requires almost 90% less excursion than the typical 1" dome tweeter, response time is drastically reduced along with distortion. The diaphragm's increased surface area also provides wide, yet controlled sound dispersion to create a realistic and highly accurate soundstage. Music sounds detailed, but smooth and effortless, without a trace of harshness.

Excellent midrange and bass

The F20 boasts a 5-1/2" woven fiberglass cone woofer that delivers rich, accurate midrange performance. The bottom end is anchored by dual 6-1/2" aluminum woofers that deliver powerful, musical bass. A bottom-firing port offers extended low-frequency response that's also tight and tuneful. And the cabinet features new anti-vibration F.A.S.T. feet that can be installed and adjusted by hand.

Unique crossover network

MartinLogan's proprietary Vojtko™ crossovers are named after MartinLogan's chief audio technologist, Joe Vojtko. The latest Motion speakers feature upgraded McCracken-Vojtko crossovers, so named for the influence of the company's other well-known Joe — senior loudspeaker designer Joe McCracken.

No matter what they're called, the aim is always the same: each speaker's drivers are carefully selected or designed to operate within an intentional frequency range and specific performance parameters. That allows the crossover networks — built from high-quality capacitors and resistors — to be clean and uncomplicated, for purer sound.

Got wire?

Most speakers don't include any. Read our article about choosing and installing speaker wire.
Shop our selection of speaker wire.


Product highlights:

  • 1" x 1.4" Gen2 Obsidian Folded Motion® tweeter with custom waveguide
  • 5-1/2" woven fiberglass cone midrange with cast polymer basket
  • dual 6-1/2" aluminum cone woofers with cast polymer baskets
  • bass-reflex (ported) cabinet with bottom-firing port
  • frequency response: 35-25,000 Hz
  • upgraded McCracken-Vojtko crossover network
  • sensitivity: 92 dB
  • nominal impedance: 4 ohms
  • recommended amplifier power: 20-300 watts
  • removable magnetic grilles
  • fully adjustable anti-vibration F.A.S.T. feet
  • dual five-way binding post speaker terminals allow bi-amping or bi-wiring
Dimensions and warranty:
  • 11-13/16"W x 44-9/16"H x 14-5/16"D
  • weight: 60 lbs.
  • warranty: 5 years (with product registration)
  • MFR # MF20GB

High-performance amplifier recommended. See receivers & amps for this speaker

What's in the box:

  • Floorstanding loudspeaker
  • Front-panel with 3 grilles (pre-installed)
  • 2 Jumper-straps (pre-installed)
  • 4 Outrigger feet
  • 4 Rubber isolators
  • 4 Spikes
  • 4 Screws
  • Hex-key
  • Cloth speaker cover
  • Quick Start Guide

See the difference between "Open Box" and "Scratch & Dent" Outlet items

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More details on the MartinLogan Motion F20

Stacey B.

Features & specs

Enclosure Ported
Finish MDF/Lacquer
Color Gloss Black
Tweeter Folded Motion Ribbon
Tweeter Size (inches) 1.0 x 1.4
Midrange Size (inches) 5.5
Woofer Size (inches) 6.5
Woofer Composition Aluminum
Woofer Surround Rubber
Built-in Powered Sub No
Dolby Atmos Drivers No
Connector Type Binding post
Bi-amp Inputs Yes
Parts Warranty 5 Years
Labor Warranty 5 Years
Power Range 20-300
Frequency Response 35-25k Hz
Sensitivity 92 dB
Impedance (Ohms) 4
Subwoofer Amp Power ---
Height (inches) 44-9/16
Width (inches) 11-13/16
Depth (inches) 14-5/16
Weight 60 lbs

Product Research


Thin-Film Technology & Controlled Dispersion: By using advanced Thin-film Technology and Controlled Dispersion, the MartinLogan Motion F20 floorstanding loudspeaker delivers excellent high frequency response from its Gen2 Obsidian Folded Motion Tweeter (FMT) and Folded Motion Waveguide. The Gen2 Obsidian FMT uses a folded thin-film diaphragm to compress and expand air, creating a large surface area that delivers fast, accurate, and detailed high frequency reproduction. The integrated Folded Motion Wave Guide creates Controlled Dispersion to minimizes sound degrading early reflections by controlling the spread of sound from the tweeter into the room, enhancing your listening experience with greater clarity, and expanded placement options in the room.

  • Gen2 Obsidian Folded Motion Tweeter (FMT): The Motion F20 features MartinLogan's latest and greatest Thin-Film Technology, the Gen2 Obsidian Folded Motion Tweeter (FMT) - measuring 1" x 1.4". With an upgraded motor structure, the latest Gen2 Obsidian FMT provides higher output and lower distortion than ever before. The Gen2 Obsidian FMT's internal improvements elevate performance to new heights for a clean, detailed, and accurate high frequency response.
  • Folded Motion Waveguide: The Folded Motion Waveguide profile was meticulously chosen to harmoniously align the tweeter's output with the dispersion of the midrange/bass driver, resulting in enhanced output. The waveguide guarantees consistent sound quality regardless of the listener's position and minimizes unwanted room reflection for Controlled Dispersion of 90-degrees (h) x 90-degrees (v). Proper waveguide design is crucial as it helps control the sound's dispersion pattern, ensuring that the sound is evenly distributed across the listening area and resulting in optimal sound quality.

5.5" Woven-Fiberglass Midrange Driver: In addition to the 1" x 1.4" Gen2 Obsidian Folded Motion Tweeter & Waveguide, the MartinLogan Motion F20 floorstanding loudspeaker features a 5.5" Woven-Fiberglass midrange driver with a rubber surround and cast polymer basket. The lightweight and strong Woven-Fiberglass midrange driver is perfectly suited for keeping pace with the Gen2 Obsidian FMT, providing crystal clear dialog and vocals, as well as lifelike instrumentals.

Dual 6.5" Aluminum Bass Woofers: The MartinLogan Motion F20 floorstanding loudspeaker houses two 6.5" aluminum bass woofers with rubber surrounds and cast polymer baskets. The exceptional characteristics of aluminum make it an ideal choice for bass drivers. The dual 6.5" aluminum bass woofers are paired with oversized motor structures, Floor Bounce Compensation technology, and a downward-firing port that make the Motion F20 speaker extremely easy to place in any room while providing outstanding bass performance at any volume. Floor Bounce Compensation combines precision woofer placement and crossover tuning to produce a more natural and full sound by taking advantage of a constant found in all listening rooms - the presence of a floor.

McCracken-Vojtko Crossover: Carefully designed using proprietary measurement and simulation software, plus tuned using double-blind listening, the McCracken-Vojtko 3-way crossover perfectly melds the 1" x 1.4" Gen2 Obsidian Folded Motion Tweeter, one 5.5" Woven-Fiberglass midrange driver, and two 6.5" aluminum bass woofers together for a cohesive and beautiful sound.

Bass Reflex MDF Cabinet: The Motion F20 floorstanding loudspeaker employs a solid built cabinet design to eliminate fidelity robbing vibrations. The speaker cabinet is constructed from MDF (medium density fiberboard) with an extra-thick front baffle and additional internal bracing to further reduce cabinet resonance. On the bottom of the cabinet is a down-firing "single-cannon" port which helps the speaker provide deeper, cleaner, and more powerful bass across a broader range of placement options. The cabinet is available in three finishes - Satin White, Walnut Veneer, or Gloss Black.

Dual Binding Posts: The Motion F20 is outfitted with two sets of binding posts allowing you to bi-amp or bi-wire the floorstanding speaker. These binding posts ensure a secure connection to many types of cable and connectors. The binding post terminals will accept banana plugs (single only), pin-connectors, spade-lugs, and bare wire (up to 10AWG).

  • Bi-Wiring: Bi-wiring can provide noticeable improvements in the overall transparency of your loudspeakers. Run separate speaker wires to the low & high frequency drivers from a single amplifier (the upper set of binding posts are for the high frequency drivers; the lower set of binding posts are for the low frequency drivers).
  • Bi-Amping: Bi-amping allows you to use separate amplifiers for the high & low frequency sections of your loudspeaker for greater dynamic range & lower distortion. We recommend that your separate amplifiers have identical gain to preserve the speaker's voicing balance.
Note: If you decide to bi-wire or bi-amp, you must remove the jumpers between the terminal posts (failure to do this could result in damage to your amplifier and loudspeakers).

Mounting & Placement Options: The F20 floorstanding speaker includes MartinLogan's F.A.S.T. Outrigger Feet that allow effortless, tool-free height adjustment and the option for rubber isolators or spikes. The rubber isolators are great for hardwood, laminate, tile, vinyl and other hard surface flooring. The spikes should only be used on carpeted surfaces (the spikes can damage hard surface flooring). You can adjust the height of each foot to accommodate uneven flooring for maximum stability. The F.A.S.T. Outrigger Feet and the rubber isolators or spikes provide anti-vibration properties to reduce the transfer of energy from the speaker to the floor, resulting in lower distortion and coloration - providing a more accurate and detailed sound.

  • Dimensions with Rubber Isolators: 11.8125" (w) x 44.0625" (h) x 14.3125" (d)
  • Dimensions with Spikes: 11.8125" (w) x 44.5625" (h) x 14.3125" (d)

Note: The Motion F20 should always be used with the F.AS.T. Outrigger Feet and rubber isolators or spikes installed for optimum sound performance and maximum stability.

Placement Options: Although the F20 floorstanding speaker is designed to deliver a superb sonic performance when placed close to a wall, you may notice improved imaging and detail if you are able to place the speaker 2' or more' from the rear wall and 2' or more from the side walls. To achieve the best stereo imaging, a pair of speakers should form an equilateral triangle between each other and the main seated listening position. To enhanced the stereo image even more, you should angle (or "toe-in") a pair of speakers toward the primary listening position.

Motion Series: MartinLogan's Motion Series is inspired by the performance of their top-of-the-line electrostatic speakers and is perfect for music or home cinema lovers. Pairing high-performance Woven Fiberglass midrange/bass drivers with the latest Gen2 Folded Motion Tweeter technology. With a bold new look and a suite of new audio upgrades, the Motion series is ready to impress in your home. Through a rigorous development process involving anechoic chamber measurements, blind listening tests, and in room measurements MartinLogan crafted a more refined sound for the Motion Series that is a whole new level of quality and excellence. The Motion Series consists of two floorstanding loudspeakers (Motion F10/F20), a bookshelf loudspeaker (Motion B10), a center-channel speaker (Motion C10), and a Surround loudspeaker (Motion MP10).

Optional Powered Subwoofer: Add on an optional MartinLogan powered subwoofer (sold separately - see Accessories Tab) for bigger and deeper bass response when listening to your movie and music soundtracks.

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Customer Q&A

2 questions already asked

Do you need a 300w per channel amp to run these speakers safely?
bonniebee  Sep 19, 2023
1 answer
You do not, Reece. With the MartinLogan Motion F20's, 300-watts RMS would be the maximum wattage you could match, and that would provide the ultimate in performance. These are also rated for a minimum of 20-watts RMS, so they can sound good on even that small amount of power! A solid quality integrated amp at around the 100-watts RMS per channel range would be a really nice pairing in my opinion for all-around use. The Yamaha A-S701 in the handy link below would be a great call for an integrated amp with solid sound quality! If you are looking for maximum performance, you can always pair amps that get closer to the 300-watts max RMS. These MartinLogan Motion F20's sound crisp yet smooth, I am a big fan!
bo  Sep 19, 2023 (Staff)
Do you need a 300w per channel amp to run these speakers safely?
bonniebee  Sep 19, 2023
1 answer
Greetings Reece. Thank you for your question. The power range is a minimum 20 watts of power all the way to 300 watts of power. Anything between that can run these, however speakers will sound better the closer you can get to that top level of the power range.
hogan  Sep 19, 2023 (Staff)

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