Martin Logan Motion Foundation B2

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The Motion Foundation B2 is the flagship bookshelf model in the Motion Foundation line, delivering remarkable detail and room-filling sound that belie its compact size. Powered by MartinLogan’s fast and articulate Gen2 Folded Motion tweeter coupled with a robust 6.5″ aluminum mid-bass driver, it offers crisp highs and tight bass down to 42 Hz, thanks to its rear-port design.

Martin Logan Motion Foundation B2 Bookshelf Speaker

  • Gen2 Obsidian Folded Motion® Tweeter S with waveguide delivers ultra-fast, low distortion highs and wide 90°×90° dispersion
  • 6.5″ aluminum mid-bass driver, derived from MartinLogan's higher-end Motion XT series, ensures clear, punchy midrange and bass
  • Bass-reflex (rear-ported) cabinet extends bass response naturally down to 42 Hz (±3 dB)
  • Controlled dispersion via folded waveguide ensures consistent sound quality off-axis, minimizing room reflections
  • McCracken–Vojtko crossover network with premium components for smooth driver integration and high fidelity
  • High sensitivity (90 dB) and nominal 5 Ω impedance, designed for 15–100 W amplifiers
Frequency Response

42 Hz - 23 kHz ± 3 dB

Tweeter Dispersion (horizontal x vertical)

90° x 90°

Recommended Amplifier Power

15 - 100 watts

Sensitivity

90 dB

Impedance

5 ohms

High Frequency Driver

0.94” x 1” (2.4 x 2.5cm) Gen2 Folded Motion® Tweeter S with 3.5 in2 (22.6 cm2) diaphragm.

Crossover Frequency

3,800 Hz (2-way)

Mid-Frequency Drivers

6.5” (16.5cm) aluminum cone with cast aluminum basket. Non-resonant sealed chamber format. Unibody cone construction.

Cabinet

Rear Ported

Binding Post Inputs

5-way Binding Posts (Non Bi-Wire)

Weight

15lbs / 6.8kg

Dimensions (H x W x D)

15” x 7-3/4” x 11-1/2”
38.1cm x 19.7cm x 29.2cm

Finish

Black, Walnut, and Satin White

Legendary MartinLogan Sound

Legendary MartinLogan Sound

MartinLogan speakers are known for their exceptional articulation, detail and realism, regardless of the listening environment. By using advanced thin-film technologies and Controlled Dispersion, MartinLogan delivers a unique and unparalleled listening experience that is not commonly found in other speakers.

Legendary MartinLogan Sound

MartinLogan speakers are known for their exceptional articulation, detail and realism, regardless of the listening environment. By using advanced thin-film technologies and Controlled Dispersion, MartinLogan delivers a unique and unparalleled listening experience that is not commonly found in other speakers.

Legendary MartinLogan Sound

Gen2 Obsidian Folded Motion Tweeter S

The Gen2 FMT S offers effortless performance, unmatched by conventional technologies. By folding thin film material, MartinLogan is able to pack more surface area into a small space. Large surface area, light weight and low excursion means an incredibly fast and responsive tweeter capable of reproducing the most nuanced content with stunning detail and clarity.

Gen2 Obsidian Folded Motion Tweeter S

The Gen2 FMT S offers effortless performance, unmatched by conventional technologies. By folding thin film material, MartinLogan is able to pack more surface area into a small space. Large surface area, light weight and low excursion means an incredibly fast and responsive tweeter capable of reproducing the most nuanced content with stunning detail and clarity.

Folded Motion® Waveguide

Enhances the Controlled Dispersion of the tweeter, blanketing the listening area with incredible detail and precision. Avoids performance robbing room reflections and provides a more consistent sound across a wider seating area.

Folded Motion® Waveguide

Enhances the Controlled Dispersion of the tweeter, blanketing the listening area with incredible detail and precision. Avoids performance robbing room reflections and provides a more consistent sound across a wider seating area.

Aluminum Mid-Bass Driver

Using trickle down technology from MartinLogan’s own Motion XT and Motion Series, the B2 uses the exceptional properties of Aluminum to maximize clarity, detail, and output from the mid-bass driver.

Aluminum Mid-Bass Driver

Using trickle down technology from MartinLogan’s own Motion XT and Motion Series, the B2 uses the exceptional properties of Aluminum to maximize clarity, detail, and output from the mid-bass driver.

Modern Design Featuring Timeless Finishes

Modern Design Featuring Timeless Finishes

Motion® Foundation® models are available in 3 timeless finishes to compliment any decor: Walnut with Bronze trim, Black with Gunmetal trim, or Satin White with Silver trim.

Modern Design Featuring Timeless Finishes

Motion® Foundation® models are available in 3 timeless finishes to compliment any decor: Walnut with Bronze trim, Black with Gunmetal trim, or Satin White with Silver trim.

Modern Design Featuring Timeless Finishes
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