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M350 3-way floorstanding: 1-in EWB dome tweeter, 4.5-in midrange, 4 x 5.25-in woofer. (Price shown for each)

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Experience rich, full-range sound while enjoying music, movies, and more using the M350 Floorstanding Loudspeaker from Boston Acoustics. This three-way speaker combines a 1-inch Extended Wide Bandwidth dome tweeter with a 4.5-inch midrange and four 5.25-inch woofers for smooth, natural sound and dynamic bass. The M350's Lo-Q cabinet is built to reduce vibrations and eliminate unwanted resonances. The M350 can be used with 50- to 500-watt amplifiers and has the highest power-handling capability of any Boston M-Series loudspeaker.

Three-Way Floor-Standing: 1-inch EWB Dome Tweeter, 4.5-inch midrange, 4 x 5.25-inch woofer Product Shot
The Lo-Q cabinet reduces vibrations and eliminates unwanted resonances.View larger.
Three-Way Floor-Standing: 1-inch EWB Dome Tweeter, 4.5-inch midrange, 4 x 5.25-inch woofer Product Shot
Very high quality crossover networks featuring low loss film capacitors and low distortion laminated silicon steel core inductors are utilized for greater clarity and minimal coloration.
View larger.
Three-Way Floor-Standing: 1-inch EWB Dome Tweeter, 4.5-inch midrange, 4 x 5.25-inch woofer Product Shot

An internal chamber for the midrange prevents acoustic interference. View larger.
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M350 Floorstanding loudspeaker
At a Glance.
  • 1-inch EWB dome tweeter for greater clarity and less distortion
  • 4 ½-inch midrange uses mass loading for smooth frequency response
  • Four 5 ¼-inch woofers for optimal bass
  • Lo-Q cabinet reduces vibrations and eliminates unwanted resonances
  • Internal chamber for midrange to prevent acoustic interference
  • Five-year limited warranty
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EWB Tweeter

Clear, Natural Sound for Music, Movies, and More
The M350 Floorstanding Loudspeaker is equipped with Boston's signature 1-inch Extended Wide Bandwidth (EWB) dome tweeter, which is designed to cover a broad range of frequencies, reduce distortion, and improve clarity in the high registers. Unlike most tweeters, the EWB has a small dimple in the middle and a large radiating surface that extends from the center to the outside perimeter of the diaphragm. This design enables the tweeter to track subtle treble details and reproduce the highest frequencies with ease.


Smooth Bass Response
A 4.5-inch polypropylene midrange employs mass loading to dampen harmful resonances and achieve a smoother frequency response at the top of the driver's range. The M350 also features an array of four 4.5-inch polypropylene woofers that produce multiple floor reflections that minimize sensitivity to placement and optimize bass response. The woofers feature aluminum shorting rings for dramatically lower distortion and a clearer sound.

MDF Piece Of Wood

Lo-Q Construction to Limit Vibrations
The M350 has a cabinet made of Lo-Q, a material consisting of two pieces of medium-density fiberboard joined together with a thick layer of damping adhesive in the middle. This material significantly reduces cabinet vibrations to virtually eliminate unwanted resonances allowing the M350 to create a larger, more vivid soundstage.

Midrange Highlight

An internal chamber acoustically isolates the midrange from the woofers to prevent interference and serves as a reinforcing brace near the top of the cabinet to add rigidity and reduce vibrations even further.

The cabinet also contains heavy-duty absorptive fill and internal braces that have been carefully positioned to maximize the speaker's strength and optimize sound. The M350's black gloss finish and curved side panels with faux leather wrap can complement any decor.

Product and Warranty Information
This product measures 42.37 by 9.62 by 12.19 inches (H x W x D) and weighs 55.9 pounds. It is recommended for use with a 50- to 500-watt amplifier.

The M350 Floorstanding Loudspeaker is backed by a five-year limited warranty, subject to the full warranty terms and conditions.

What's in the Box
M350 Floorstanding Loudspeaker, speaker spikes, and owner's manual.


Nominal Impedance
Compatible with 8 ohm outputs
Crossover Frequency
400Hz, 3000Hz
4.5" midrange, 4 x 5.25" woofer
High-Frequency Driver
1"(2.5cm) EWB dome
Recommended Amplifier Power
50-500 watts
Sensitivity (1 watt (2.83v) at 1m)
90 dB
Frequency Response (+- 3dB)
45Hz - 30KHz


Ryan Wanaita, Digital Trends
"We were thoroughly impressed with the system, which created a gorgeous collage of sound, wrapped in a beautiful and well-engineered package."

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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