MartinLogan Dynamo IW-O In-Wall Subwoofer with an Open Back Design - Dreamedia AV
Vendor: MartinLogan

MartinLogan Dynamo IW-O In-Wall Subwoofer with an Open Back Design

In-wall subwoofer with deep bass and flexible installation

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MartinLogan Dynamo IW-O In-Wall Subwoofer with an Open Back Design

Experience the Power of Invisible Bass

Imagine a home theater system that not only immerses you in the on-screen action but also captivates you with an invisible force of deep, resonant bass that vibrates through your very core. The MartinLogan Dynamo IW-O In-Wall Subwoofer is designed to do just that, all while maintaining a sleek, unobtrusive presence in your living space. This non-powered in-wall subwoofer brings the thrill of cinema-quality low frequencies into your home without the need for bulky, floor-standing units.

Design That Resonates with Your Lifestyle

At Dreamedia, we understand that aesthetics are as important as acoustics. The Dynamo IW-O's open back design is engineered for those who appreciate both. It offers:

  • Dual 8” High-Excursion Woofers: Crafted from carbon-fiber-reinforced polypropylene, these woofers deliver a bass experience that's both dynamic and controlled.
  • Paintable White Finish: This subwoofer blends into any décor. You can even paint it to match your wall color for a truly seamless integration.
  • Stealth Installation: With its minimalist design, the Dynamo IW-O maintains the elegance of your space. It's the bass you feel, not see.
  • Retrofittable: Whether you're remodeling or building new, the subwoofer is designed to fit into standard wall cavities, making installation a breeze.

Uncompromised Sound Quality

This is where the Dynamo IW-O shines – delivering deep, articulate bass that enhances every viewing experience.

  • Frequency Response: Enjoy a smooth bass response from 30 Hz to 190 Hz, with a low-frequency extension down to 25 Hz for those earth-shaking rumbles that bring movies to life.
  • Power Handling: With a max input power of 400W and a suitable amplifier range of 50-800W, this subwoofer is built to handle dynamic cinematic explosions as well as the subtle nuances of a double bass in a jazz trio.

Installation Made Easy

Dreamedia is here to help design your perfect home theater setup, and the Dynamo IW-O is a testament to user-friendly installation.

  • GRIP™ Chassis/Mounting Bracket: Ensures a secure, vibration-free installation.
  • Cut-Out Dimensions: At 18” x 9-5/8”, it fits comfortably between standard studs.
  • Minimum Mounting Depth: Requires only 3-1/2”, making it versatile for various wall constructions.

Tailored Performance

Your home theater is unique, and so should be the performance of your subwoofer. The Dynamo IW-O offers:

  • Bass Extension: The open back design allows for deeper bass extension, creating a visceral experience that's felt as much as heard.
  • Output Potential: Benefit from higher output potential, ensuring that your subwoofer fills your room with powerful bass.
  • Sound Control: With the optional High Output Back Box, you can fine-tune the bass to your room's acoustics.
  • Amplifier Compatibility: Optimized to work with MartinLogan MDA series and MP500 amplifier, for a match made in audio heaven.
  • Custom DSP Presets: For those who want to dial in their sound, the subwoofer supports custom presets to get the most out of your system.
  • ARC Genesis Room Correction: Compatible with advanced room correction software to optimize bass response for your specific room characteristics.

The Dreamedia Advantage

When you choose Dreamedia for your home theater needs, you're not just getting a product; you're getting a partner in creating the ultimate audio-visual experience.

  • Design Service: Our experts are on hand to help you integrate the Dynamo IW-O into your home theater system seamlessly.
  • Expertise: We know the nuances that make a good product great, and we're here to guide you through every step.
  • Support: Have questions or need assistance? We're just a call or click away, ready to support your home theater journey.

Elevate Your Home Theater Experience

The MartinLogan Dynamo IW-O In-Wall Subwoofer isn't just another piece of your home theater system; it's the heart of the bass that pumps vitality into your movies, music, and games. Here's why it stands out:

  • Deeper Bass Extension: Feel the difference with bass that extends deeper than many traditional subwoofers.
  • Higher Output: Experience the thrill of powerful, room-filling bass in every scene or song.
  • Flexible Installation: Whether you choose the open-wall cavity or the optional backbox, installation adapts to your home's construction.
  • Paintable Design: The subwoofer's discreet, paintable grille lets you match it to your wall for an invisible sound source.
  • Optimized Performance: When paired with the recommended MartinLogan amplifiers, the Dynamo IW-O performs at its best, delivering precise, impactful bass.


The MartinLogan Dynamo IW-O In-Wall Subwoofer with an Open Back Design is a game-changer for those seeking powerful, detailed bass without compromising on aesthetics. Its advanced features, combined with the Dreamedia design service, make it a compelling choice for any home theater enthusiast. Feel the power of invisible bass and let the Dynamo IW-O transform your audio experience.

Our Review

MartinLogan Dynamo IW-O In-Wall Subwoofer Review


MartinLogan is a name that resonates with audio purists and home theater enthusiasts alike. Renowned for their electrostatic speaker technology and precision sound, the brand has carved out a significant niche in the high-end audio market. The Dynamo IW-O in-wall subwoofer is a bold offering, promising the signature MartinLogan performance in a discreet, in-wall package. This review delves into the capabilities and design of the Dynamo IW-O, assessing its potential impact on the home theater market.

Design and Aesthetics

The Dynamo IW-O in-wall subwoofer presents a minimalist aesthetic that is both elegant and versatile. Its design allows for a near-invisible integration into any living space, which is a boon for those who prefer an uncluttered environment. The white, paintable finish is a thoughtful touch, enabling users to match the subwoofer to any wall color or texture, ensuring it complements the home décor.

Quality is evident in the construction; the use of carbon-fiber-reinforced polypropylene in the dual 8” woofers not only promises durability but also hints at the subwoofer's performance capabilities. The overall build exudes the premium feel that one would expect from MartinLogan.

Installation Flexibility

One of the Dynamo IW-O's key selling points is its installation flexibility. The open back design offers deeper bass extension and higher output potential, making it suitable for a variety of spaces. It can be installed in a standard wall cavity without additional enclosures or with an optional backbox for more controlled performance.

The inclusion of the GRIP™ chassis/mounting bracket is a testament to MartinLogan's attention to detail, ensuring a secure and vibration-free installation. This design feature not only aids in maintaining audio integrity but also simplifies the installation process for both professional installers and DIY enthusiasts.


The Dynamo IW-O is packed with features tailored for the audiophile. The dual 8” high-excursion woofers are the heart of the system, capable of producing deep and articulate bass that can be felt as much as heard. The compatibility with MartinLogan's MDA series and MP500 amplifier is a smart inclusion, allowing for seamless integration and optimized performance within the brand's ecosystem.

Advanced Technology

The technological prowess of the Dynamo IW-O is most evident in its low-frequency drivers. The carbon-fiber-reinforced polypropylene cones are engineered to deliver precise bass without distortion. The low-frequency extension down to 25 Hz (DIN) is impressive, ensuring that even the most demanding soundtracks are rendered with full-bodied depth.

The frequency response of +/-3dB from 30 to 190 Hz is indicative of the subwoofer's ability to handle a wide range of bass frequencies with accuracy and balance. This is essential for a truly immersive home theater experience, where every explosion, musical note, and subtle rumble should be experienced as the director or artist intended.


In terms of performance, the Dynamo IW-O stands out in its class. It delivers a bass response that is both powerful and nuanced, with clarity that complements high-resolution audio and complex soundscapes. When compared to other in-wall subwoofers, the Dynamo IW-O's open back design and advanced driver technology give it an edge, particularly in the low-end extension and overall output.

Power Handling and Output

With a max input power of 400W and a suitable amplifier range of 50-800W, the Dynamo IW-O is capable of filling even large rooms with authoritative bass. The power handling is well-suited to a variety of amplifiers, allowing users to match the subwoofer with their existing equipment or opt for a MartinLogan amplifier for a tailored experience.

The open back design contributes to the subwoofer's ability to produce deep bass with high output potential. However, this design choice also necessitates careful consideration of the subwoofer's placement within a home, as it may lead to sound transfer into adjacent rooms.

Acoustic Considerations

The potential for sound transfer is an important consideration for the Dynamo IW-O. In multi-room or shared wall installations, the open back design may cause noise complaints. This can be mitigated by using the optional backbox or by ensuring that the subwoofer is installed in a wall that does not adjoin noise-sensitive areas.

Integration with Home Theater Systems

The Dynamo IW-O is designed to be a cohesive component within a home theater system. Its ability to blend with other MartinLogan speakers ensures a unified soundstage, making it a strong candidate for those looking to build or upgrade their system with components from the same brand. The subwoofer's performance complements high-resolution audio sources and advanced surround sound formats, making it a versatile choice for various multimedia applications.

Pros and Cons

- Deep bass extension and high output potential enhance the immersive experience.
- Flexible installation options cater to different construction scenarios.
- The minimalist, paintable design allows for seamless aesthetic integration.
- Compatibility with MartinLogan amplifiers ensures optimized performance.

- The open back design may lead to unwanted sound transfer into adjacent spaces.

Final Thoughts

The MartinLogan Dynamo IW-O in-wall subwoofer is a compelling product that offers exceptional performance in a discreet package. It is a testament to the brand's commitment to audio excellence and design innovation. While the potential for sound transfer should be considered, the overall value proposition of the Dynamo IW-O is strong. It is ideal for dedicated home theaters or multi-use spaces where high-quality audio is a priority. For potential buyers, the blend of performance, design, and installation flexibility makes the Dynamo IW-O a standout choice in the in-wall subwoofer market.



  • Type: Non-powered in-wall subwoofer
  • Enclosure Design: Open back
  • Woofer Configuration: Dual 8” high-excursion carbon-fiber-reinforced polypropylene woofers
  • Mounting: In-wall installation
  • Chassis/Mounting Bracket: GRIPTM
  • Optional Accessory: High Output Back Box (HOBB)
  • Finish: White, paintable
  • Stealth Installation: Yes
  • Retrofittable: Yes

Frequency Response

  • Response Range: +/-3dB from 30 Hz to 190 Hz
  • Low Frequency Extension: 25 Hz (DIN)

Power Handling

  • Max Input Power: 400W
  • Suitable Amplifier Range: 50-800W

Dimensions and Weight

  • Cut-Out Dimensions: 18” x 9-5/8” (45.7cm x 24.5cm)
  • Minimum Mounting Depth: 3-1/2” (8.9cm)
  • Overall Dimensions: 19-1/8” x 10-3/4” x 3-1/2” (48.5cm x 27.2cm x 8.9cm)
  • Weight: 15lbs (6.8kg) each

Driver Details

  • Woofer Size: Two 8” (210-mm)
  • Voice Coils: 1-1/2” (38-mm) 8-layer copper wire
  • Surrounds: Over-molded TPRTM
  • Magnet Structures: Ceramic/ferrite

Internal Volume

  • Standard Wall Cavity: 88L
  • With Optional Backbox: 26L

Additional Features

  • Bass Extension: Deeper bass extension with open back design
  • Output Potential: Higher output potential with open back design
  • Sound Control: Available with High Output Back Box
  • Amplifier Compatibility: MartinLogan MDA series and MP500 amplifier
  • Distributed Audio Support: Yes
  • Custom DSP Presets: Yes
  • ARC Genesis Room Correction: Compatible

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