Martin Logan Motion Foundation B1 (Please Call/In-Store Shopping)

Sale price$799.99

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Color (a pair): Black

Color (a pair)

Add-On: By Itself (a pair)


Martin Logan Motion Foundation B1

Please note that the price indicated is for a pair.

Small in size but not sound, the most compact Motion Foundation model offers unheard of performance from such a versatile size.

The Gen2 Obsidian Folded Motion Tweeter S, Folded Motion Waveguide, and 5.5” aluminum midbass driver work together here to create a completely unexpected and engaging experience from a compact footprint. Foundation B1 is ideal for small spaces, especially when combined with a subwoofer, to create a highly musical, detailed experience wherever high quality sound is desired. Foundation B1 is also threaded to work with our STAND25 to create a stable stand mount solution.


Frequency Response

48 Hz - 23 kHz ± 3 dB

Tweeter Dispersion (horizontal x vertical)

90° x 90°

Recommended Amplifier Power

15 - 100 watts


89 dB


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

3,400 Hz (2-way)

Mid-Frequency Drivers

5.5” (14cm) aluminum cone with cast aluminum basket. Non-resonant sealed chamber format. Unibody cone construction.


Rear Ported

Binding Post Inputs

5-way Binding Posts (Non Bi-Wire)


11.5lbs / 5.2kg

Dimensions (H x W x D)

13-11/16” x 7-1/4” x 9-1/2”
34.6cm x 18.4cm x 24.05cm


Black, Walnut, and Satin White