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MartinLogan Dynamo 300 Home Theater and Stereo Subwoofer

4.7 out of 5 stars 311 customer reviews
| 63 answered questions

Available from these sellers.
  • Ultra efficient low-distortion, 75-watt amplifier with 150-watt peak output
  • Low-distortion 8-inch polypropylene cone woofer
  • Low-turbulence port for extreme bass output
  • High-density cabinet construction
  • Connects via Stereo Left/Right Inputs or Home Theater LFE Input
1 new from $219.99 1 used from $249.99

Technical Details

  • Brand Name: MartinLogan
  • Model Number: Dynamo 300
  • Color: Black Ash
  • Speaker Type: Subwoofers
  • Manufacturer Warranty Description: 3 year parts and labor warranty

Product Description

Every element of Dynamo 300, from driver to amplifier to crossover to cabinet, is meticulously designed and manufactured to our highest standard. The result is staggering low-frequency performance for a subwoofer of its size and price. Perfect for either home theater or stereo applications, the Dynamo 300 is built with high-density materials to minimize cabinet resonance and provide a solid foundation for the high-output 8-inch woofer and high-current 75-watt, 150-watt peak amplifier. Whether you are looking for high performance bass to enhance your music experience or take your home theater system to the next level, a new Dynamo family subwoofer should be at the top of your list.

Product Information

Product Dimensions 13.8 x 12.6 x 14.2 inches
Item Weight 21.5 pounds
Shipping Weight 25.6 pounds
Manufacturer MartinLogan
Shipping Advisory This item must be shipped separately from other items in your order. Additional shipping charges will not apply.
Item model number Dynamo 300
Customer Reviews
4.7 out of 5 stars 311 customer reviews

4.7 out of 5 stars
Best Sellers Rank #40 in Electronics > Home Audio & Theater > Home Theater Systems > Speakers > Subwoofers
#1,901 in Electronics > Home Audio & Theater > Speakers
Date first available at Amazon.com January 31, 2011

Technical Specification

Warranty [pdf ]

Warranty & Support

Product Warranty: For warranty information about this product, please click here


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By A. Ioannides on April 12, 2012
Verified Purchase
I have a pair of Martin Logan Sequel speakers for my main 2 channel listening and have always been impressed with the bass the 8" drivers deliver. So when I setup my home theater, I got a Grotto sub and was really impressed with the definition and extension of the subwoofer. I've got a smaller system that features a pair of Mission speakers and a low cost receiver with a sub output and was looking for a low cost sub. I found this the Dynamo 300 for less than $250 on Amazon and thought I would give it a try.

It was delivered the next day (WOW) and is a bit smaller than the Grotto, but had the familiar look and feel of an American made product from Martin Logan. One problem was the port extension had come lose inside and needed to be reattached. Rather than send it back, I just took the amp out and fixed it myself. Setup was pretty easy with my Onkyo receiver, I set the crossover frequency at 100 and started playing with placement. After a couple of days of break in, playing with the placement and reducing the crossover in my receiver to 90, it started giving me the results I was looking for. It has enough power to fill my small room with very good bass and works well on movies and music. Don't let the 70 Watt rating fool you, this thing tumps.

The sound is accurate and tight. The extension is very good, it goes much lower than I expected and without being boomy like so many woofers. Some notes: Setup the system to crossover to take over where your main speakers leave off, as low as you can. My speakers can go down to 50 Hz but don't do a good job at anything below 80 Hz so I set the crossover at 90 Hz. At 100 Hz it was way to boomy. I then used the receiver crossover to remove anything below 90 Hz going to my main speakers and that made a huge improvement.
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Verified Purchase
I was a bit hesitant to buy a Martin Logan sub at first. I know that sounds weird because, hey, it's Martin Logan, but there's a perfectly good reason. I was concerned that a company who makes speakers that sell for thousands of dollars would REALLY drop the ball when it came to a sub that sells for less than $200.

I read through all the reviews and got a good feel for what to expect. A sub that, at first, would sound a bit harsh, but that would "settle" as it moved past the break-in period.

I received it on the very same day predicted by the Amazon ordering system, and raced home to set it up, leaving work early and breaking several speed limits in the process. The packaging was solid, and the sub arrived in good condition.

After reading the manual, I proceeded to set it up in the front corner of my entertainment room. The reviews were right, it DOES sound a bit harsh and out-of-place at first. The bass hits were heavy and sort of distorted, but this was to be expected after reading through the manual as well as all of the prior customer reviews. I watched a couple of movies with good sound-tracks "The Dark Knight", "300", and "Braveheart" to see how it would integrate with my system. Although the sound did have that harsh edge, it still produced a much better overall theater presence than my sub-less system did the day before. I decided to break it in the quick way, and set up some streaming music to play continuously during the day while I was at work. After a few days of 8+ hours of music playing through it at a moderate volume, the edges started to smooth out and the sound became much more musical and transparent.

People say the best speaker is the one you forget is there, and that's exactly what this sub is.
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Verified Purchase
**Update 11/17/2015

Have been using the ML 300 with a Pioneer 1223 (not quite elite, but similar tech), and the depth is more impressive than I would imagine from a woofer this size. Having it positioned up near the front sound field gives the whole theater experience an immersive sound, that is where most theaters including IMAX place their subs. My speaker setup has also changed except the center channel; Bose 161s for FR & FL, Klipsch Quintets for SR SL, subwoofer turned up half-way also sounds superb on a padded and carpeted floor. The room size is no larger than 20X20'. Cheers

Just a brief review for those who might be considering this purchase. (This is not edited for perfection). But I am a graduate student with lots of practice!!! I really hope this review helps you decide what is truly best for you based on several factors. This review is hardly exhaustive, rather it is enthusiastic and summative.

It is my first ML product, and there are quite a few positive reviews online besides Amazon, so do yourself a favor and research it thoroughly.

I say this because it most likely is limited to specific size rooms and home theater system set ups. For example, I have Harman Kardon AVR 1700 in a smaller sized living room, with Klipsch Quintet front LR speakers, a Definitive Technology Mythos 3 CNTR, and Bose loudspeakers for SRL.

Not a huge system, but definitely fully equipped with clarity and excellent sounds in music and movies and games on the PS3.

What does the subwoofer do well? I transitioned from a Bose bass-module set up to this one. The Bose are full across the board. The Dynamo truly goes beyond full, more into the realm of deep and distinct.
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