Motion Foundation B1

The MartinLogan Motion Foundation B1 is the most compact bookshelf speaker in the Motion Foundation Series, delivering exceptional performance from a remarkably versatile enclosure. Combining the Gen2 Obsidian Folded Motion® Tweeter S with a precision-engineered 5.5-inch aluminum mid-bass driver, the B1 produces impressive detail, natural vocals, and dynamic sound that far exceeds what its compact size suggests. It is an ideal choice for stereo music systems, desktop listening environments, and home theater surround applications.

The Gen2 Folded Motion® Tweeter works in conjunction with MartinLogan's Folded Motion® Waveguide to provide controlled 90° × 90° dispersion, reducing unwanted room reflections while creating a broad, consistent listening area. The proprietary McCracken-Vojtko crossover ensures seamless integration between the tweeter and aluminum driver, resulting in precise imaging, smooth frequency response, and outstanding clarity across the entire audio spectrum.

Despite its compact dimensions, the Motion Foundation B1 delivers impressive bass extension down to 48 Hz thanks to its rigid aluminum cone driver and carefully tuned rear-ported cabinet. The speaker is threaded for compatibility with MartinLogan's STAND25 speaker stand, providing an elegant and acoustically optimized installation for dedicated listening rooms. Secure-Lock magnetic grilles and premium cabinet finishes complete the speaker's refined appearance.

Whether used as a high-performance stereo pair, as surround speakers in a home theater, or combined with a subwoofer for full-range performance, the Motion Foundation B1 offers the speed, transparency, and controlled dispersion that define MartinLogan loudspeakers. It provides an outstanding entry point into the Motion Foundation Series, bringing genuine high-fidelity sound to compact spaces without compromise.