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2-way surround speaker: 2.5-in BMR driver, 3.50-in woofer

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Upgrade your home theater system and enjoy exceptional surround sound with the MSurround Loudspeaker from Boston Acoustics. Along with a 3.5-inch polypropylene cone woofer, the MSurround features a 2.5-inch Balanced Mode Radiator (BMR) driver for consistent sound across a wide audio range. The speaker is short enough to fit easily on shelves and walls and has ports on top to limit proximity effect and optimize performance over a wide range of placement options.

Two-Way surround speaker: 2.5 BMR driver, 3.5 woofer Product Shot
Compact cabinet allows for easier placement on shelves and walls.View larger.
Two-Way surround speaker: 2.5 BMR driver, 3.5 woofer Product Shot
Experience optimal surround sound with the 2.5-inch BMR driver.
View larger.
Two-Way surround speaker: 2.5 BMR driver, 3.5 woofer Product Shot

Keyhole mounting brackets for vertical or horizontal mounting View larger.
callout top with logo
MSurround Loudspeaker
At a Glance:
  • 2.5-inch BMR driver for optimal sound across a broad range
  • Short cabinet for easier placement on shelves and walls
  • Four-way brackets to facilitate easy mounting
  • Ports on top
  • Five-year limited warranty
callout bottom

Balanced Mode Radiator Driver for Optimal Surround Sound
The MSurround Loudspeaker features Balanced Mode Radiator (BMR) driver technology, designed to improve dialog and surround effects across a broad listening range. The 2.5-inch BMR driver uses a flat panel diaphragm that operates in two modes simultaneously. To reproduce lower frequencies, the diaphragm moves in and out like a piston--similar to how a traditional driver works. To reproduce higher frequencies, the diaphragm bends.

These two modes of operation significantly extend the usable range of the driver, resulting in enhanced high-frequency dispersion for more consistent surround sound. A low crossover point delivers clear sound reproduction in midrange frequencies where the human ear is most sensitive. The speaker also contains a 3.5-inch polypropylene cone woofer for dynamic bass.

Short Cabinet for Easy Placement
Because it uses a BMR driver, the MSurround is shorter than typical speakers with a stacked tweeter and midrange. As a result, it can more easily fit on a shelf under a display or hang on a wall. In addition, the MSurround is equipped with four-way brackets to facilitate easy mounting.

Product and Warranty Information
This product measures 9.5 by 6.56 by 4.44 inches (H x W x D) and weighs 5.5 pounds. It is recommended for use with a 50- to 150-watt amplifier.

The MSurround Loudspeaker is backed by a five-year limited warranty, subject to the full warranty terms and conditions.

What's in the Box
MSurround Loudspeaker, rubber standoffs, and owner's manual.


Nominal Impedance
Compatible with 8 ohm outputs
Crossover Frequency
3.5" woofer
High-Frequency Driver
2.5 BMR flat panel
Recommended Amplifier Power
50-150 watts
Frequency Response (±3dB)
95Hz - 22KHz
Sensitivity (1 watt (2.83v) at 1m)
86 dB


Mark Fleischmann , Home Theater
"That’s why the Boston Acoustics M Series is a speaker system for the times we live in now. It will do anything—and I mean anything—to get your attention. It wants to be the tail that wags the dog, the component that makes you need the other components that make up a system, the tipping point of temptation, square one on the path to a real system. It wants you to take one look and say, 'I want that."

Lawrence Devoe ,
"The M Series has been the beneficiary of BA’s long legacy and bears testimony to the fact that good things can come in small packages. After living with these little fellows for nearly two months, and enduring the tedious but essential break-in process, I was rewarded with surprisingly big sound belying their modest size."

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