
MartinLogan Foundation Series products redefine affordability by incorporating many of MartinLogan's renowned high-performance technologies at accessible prices. Leveraging 40 years of design and engineering prowess and offering MartinLogan’s renowned thin-film performance, Motion Foundation is a gateway into the world of true hi-fi sound. With a choice of 5 different models in 3 different finishes, Motion Foundation speakers are an ideal foundation for building a high performance Stereo or Surround sound system. Bringing high end performance to a wider audience, Motion Foundation offers incredible immersion for all your favorite content. Motion Foundation speakers feature the incredible performance of the Gen2 FMT S, bringing much of the same performance found in our/their larger siblings, in a more compact and affordable package. This high-performance tweeter is paired with a custom Folded Motion Waveguide offering consistent, smooth, and controlled sound across the listening space delivering incredible performance in every seat while also reducing some of the harmful effects of room acoustics. Rounding out the sound are specially designed aluminum woofers for both the midrange and bass drivers offering robust and detailed performance across the board. Motion Foundation models are available in 3 elegant finishes to compliment any decor: Black, Satin White, and Walnut.
Q: What is the size of the midrange driver?
A: The midrange driver is 6.5 inches.
Q: What is the weight and dimensions of the speaker?
A: The Motion Foundation B2 speaker weighs 15 pounds and measures 15.01 inches high, 7.75 inches wide, and 11.49 inches deep.
Q: What is the sensitivity of the speaker?
A: The sensitivity of the speaker is 90 decibels.
Q: What is the minimum frequency response of the speaker?
A: The minimum frequency response of the speaker is 42 hertz.
A: Larger woofer always makes more low end more available as long as the driver is capable. In this case it is. B2 has a very good balance from low to high end, especially in its price range. I've heard both extensively and myself went with the B2. The more range and headroom you give yourself the better.

MartinLogan Foundation Series products redefine affordability by incorporating many of MartinLogan's renowned high-performance technologies at accessible prices. Leveraging 40 years of design and engineering prowess and offering MartinLogan’s renowned thin-film performance, Motion Foundation is a gateway into the world of true hi-fi sound. With a choice of 5 different models in 3 different finishes, Motion Foundation speakers are an ideal foundation for building a high performance Stereo or Surround sound system. Bringing high end performance to a wider audience, Motion Foundation offers incredible immersion for all your favorite content. Motion Foundation speakers feature the incredible performance of the Gen2 FMT S, bringing much of the same performance found in our/their larger siblings, in a more compact and affordable package. This high-performance tweeter is paired with a custom Folded Motion Waveguide offering consistent, smooth, and controlled sound across the listening space delivering incredible performance in every seat while also reducing some of the harmful effects of room acoustics. Rounding out the sound are specially designed aluminum woofers for both the midrange and bass drivers offering robust and detailed performance across the board. Motion Foundation models are available in 3 elegant finishes to compliment any decor: Black, Satin White, and Walnut.

MartinLogan Foundation Series products redefine affordability by incorporating many of MartinLogan's renowned high-performance technologies at accessible prices. Leveraging 40 years of design and engineering prowess and offering MartinLogan’s renowned thin-film performance, Motion Foundation is a gateway into the world of true hi-fi sound. With a choice of 5 different models in 3 different finishes, Motion Foundation speakers are an ideal foundation for building a high performance Stereo or Surround sound system. Bringing high end performance to a wider audience, Motion Foundation offers incredible immersion for all your favorite content. Motion Foundation speakers feature the incredible performance of the Gen2 FMT S, bringing much of the same performance found in our/their larger siblings, in a more compact and affordable package. This high-performance tweeter is paired with a custom Folded Motion Waveguide offering consistent, smooth, and controlled sound across the listening space delivering incredible performance in every seat while also reducing some of the harmful effects of room acoustics. Rounding out the sound are specially designed aluminum woofers for both the midrange and bass drivers offering robust and detailed performance across the board. Motion Foundation models are available in 3 elegant finishes to compliment any decor: Black, Satin White, and Walnut.

The 4th generation Motion Series ushers in a new era of design and aesthetics for MartinLogan. The three modern, yet timeless, colorways can compliment any room while being a focal point if so desired. Motion evokes a unique look and sound, pairing high-performance woofers with exclusive Folded Motion Tweeter technology, a staple of MartinLogan products. The Motion Waveguide enhances the Controlled Dispersion of the Gen2 Folded Motion Tweeter to a generous 90°(Vertical) by 90°(Horizontal) to accommodate a wide range of seating and speaker placement options, while avoiding clarity destroying sound reflections within the environment.

Designed and engineered at our world-famous Acoustic Engineering Center of Excellence in Northridge, California, the Stage 250B is largest bookshelf loudspeaker of the JBL Stage Series. It provides impressive performance from a small footprint. The 250B's are versatile enough to be used as main speakers or surrounds. This loudspeaker features a 2-way design with Next Generation patented High-Definition Imaging (HDI) waveguide geometry, 1-inch (25mm) Anodized Aluminum dome tweeter, and a 5.25-inch (130mm) Polycellulose ribbed cone woofer that provides deep, signature JBL bass.
| Pros for MartinLogan - Motion Foundation B2 2-Way Bookshelf Speaker with 6.5” Midbass Driver (Each) - Walnut | |||
|---|---|---|---|
| Sound Quality | Sound Quality, Size | Sound Quality, Size, Mid Range, Highs | Sound Quality, Size, Tweeter, Design, Frequency Response |
| Cons for MartinLogan - Motion Foundation B2 2-Way Bookshelf Speaker with 6.5” Midbass Driver (Each) - Walnut | |||
| There were no cons for this product— | There were no cons for this product— | Bass | Bass |
Customers are satisfied with the Motion Foundation B2 bookshelf speakers' sound quality. Many appreciate the well-balanced audio, from high to low frequencies, and the detailed sound reproduction. Reviewers frequently highlighted the excellent mid-range and decent bass response. The speakers are described as sounding great overall.
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
This bad boy kicks and goes loud plenty, the tweeter is more of a sharper detailed type of high level speaker and if thats what your looking for then get this.
This review is from MartinLogan - Motion Foundation B2 2-Way Bookshelf Speaker with 6.5” Midbass Driver (Each) - Black
Alex Posted
Great Speakers Great Sound Great Size Great Price Great Product
This review is from MartinLogan - Motion Foundation B2 2-Way Bookshelf Speaker with 6.5” Midbass Driver (Each) - Satin White
KumarS Posted
The sound I was looking for. Crispy High and mid with heavy base.
This review is from MartinLogan - Motion Foundation B2 2-Way Bookshelf Speaker with 6.5” Midbass Driver (Each) - Black
SertzaiW Posted