Definitive Technology Dymension DM40 Slim Tower Speaker - Dreamedia AV
Definitive Technology Dymension DM40 Slim Tower Speaker - Dreamedia AV
Definitive Technology Dymension DM40 Slim Tower Speaker - Dreamedia AV
Definitive Technology Dymension DM40 Slim Tower Speaker - Dreamedia AV
Definitive Technology Dymension DM40 Slim Tower Speaker - Dreamedia AV

Definitive Technology Dymension DM40 Slim Tower Speaker

Slim Tower Speaker with Bipolar Design

Definitive Technology Authorized Dealer

Contact Us

Contact us if you are interested in buying this product.

Need Help?

We're here to help. Call or chat with a Dreamedia specialist.

Free Shipping

Free nationwide shipping available!*

Free Returns

30 day guarantee.
Definitive Technology Dymension DM40 Slim Tower Speaker

Unleash the Power of Sound with Definitive Technology

Imagine stepping into a world where every note of your favorite symphony, every strum of a guitar, and every beat of the drum is not just heard but felt. This is the experience that awaits with the Definitive Technology Dymension DM40 Slim Tower Speaker—an audio masterpiece designed to transform your home into a haven of high-fidelity sound.

Sophisticated Design Meets High-End Performance

The DM40 is not just a speaker; it's a statement piece. Its sleek, slim tower design is as much a testament to aesthetic excellence as it is to space efficiency. Standing elegantly at 37.4 inches tall, with a modest footprint of 10.3 x 10.0 inches, this speaker blends seamlessly into any room, enhancing its decor without overpowering it.

Exceptional Audio Clarity

At the heart of the DM40's audio prowess are the meticulously crafted drivers:

  • Tweeters: Dual 1-inch aluminum oxide domes deliver crisp, clear highs.
  • Midrange/Midbass: Four 4.5-inch woofers ensure a warm, rich midrange.
  • Subwoofers: Dual 6-inch front-firing subwoofers produce deep, impactful bass.

With a frequency response of 38 Hz–30 kHz, you'll enjoy a broad spectrum of sound, from the deepest bass to the highest notes, all with remarkable clarity and detail.

Patented Bipolar Technology

The fully balanced, adjustable bipolar array is a feature unique to Definitive Technology. It allows the DM40 to radiate sound from both the front and back of the speaker, creating a more immersive soundstage that envelops you in audio. Whether you're watching a movie or listening to music, you'll find yourself at the center of the action.

Precision Engineered for Optimal Sound

Every aspect of the DM40 has been engineered with precision:

  • Enclosure Type: The ported design enhances low-frequency response.
  • Nominal Impedance: 4Ω ensures compatibility with a wide range of amplifiers.
  • Sensitivity: 87dB for efficient power use and excellent volume.
  • Recommended Amplifier Power: 50-250W gives you the freedom to pair with your preferred amp.

Fine-Tuned Controls

Customize your listening experience with an array of controls:

  • Tone Control: Adjust bass, treble, and balance to your taste.
  • Subwoofer Controls: Independent controls for precise bass adjustment.
  • Bipolar Array Adjustment: Tailor the sound dispersion with the rear tweeter switch.

Seamless Connectivity

The DM40 offers a variety of connectivity options to ensure it fits perfectly within your existing setup:

  • Analog In/Out: Connect to a range of audio sources.
  • Digital Optical In: For high-quality, digital audio input.
  • Subwoofer PreOut: Enhance your system with additional bass.
  • Speaker Terminal: High-quality screw terminals for secure connections.
  • Headphone Out: Enjoy private listening sessions.

Convenience at Your Fingertips

Life is easier with the DM40's user-friendly features:

  • Remote Control: Manage your settings from anywhere in the room.
  • Clock and Sleep Timer: Keep track of time and save energy.
  • Programmable Timer: Set your audio to play when you want it to.

Smart Home Ready

The DM40 isn't just a speaker; it's a part of your smart home ecosystem. With compatibility for iPod and iPhone, you can integrate it seamlessly with your existing devices for a unified home entertainment experience.

Installation and Accessories

You can trust that your DM40 comes with everything you need for a straightforward setup:

  • Adjustable Floor Glides and Carpet Spikes: Ensure stability on any surface.
  • Speaker Cable Compatibility: Optimal performance with high-quality cables.

Embrace the Full Potential of Your Audio

With the Definitive Technology Dymension DM40 Slim Tower Speaker, you're not just purchasing a speaker; you're investing in an experience. Allow Dreamedia to help design your ultimate home theater system, ensuring that the DM40 is integrated perfectly to meet your specific needs.

Specifications at a Glance

  • Dimensions: 37.4 x 10.3 x 10.0 inches
  • Weight: 38.1 lbs
  • Color: Sleek Black
  • Power Output: 2 x 30 W
  • Frequency Response: 55 Hz–23 kHz (-3dB)

Your Sound, Your Style

The DM40 is more than just a speaker; it's a personal statement of your commitment to superior sound. Whether you're an audiophile seeking the perfect sound, a movie lover craving a cinematic experience, or just someone who appreciates the finer things in life, the DM40 is here to exceed your expectations.

Ready to Elevate Your Audio Experience?

Don't let another day go by without experiencing the full depth and clarity of your favorite music and movies. With the Definitive Technology Dymension DM40 Slim Tower Speaker, you're not just listening to sound—you're living it. Embrace the power of high-fidelity audio and transform your home into a sanctuary of sound.

Discover the difference with Dreamedia. Let us help you design the home theater system of your dreams, with the DM40 as the centerpiece. Contact us today to learn more about how we can enhance your audio experience.

Our Review

Definitive Technology Dymension DM40 Slim Tower Speaker Review


Definitive Technology is a brand renowned for its commitment to high-quality audio equipment, delivering products that often blend sophisticated design with exceptional sound. The Dymension DM40 Slim Tower Speaker is a testament to this ethos, promising an auditory experience that both audiophiles and casual listeners can appreciate.



The DM40 Slim Tower Speaker exudes an air of elegance and modernity. Its slim profile is not only pleasing to the eye but also suggests a meticulous attention to detail in construction. The speaker's aesthetic is likely to complement a variety of interiors, from minimalist to more traditional decors.

Build Quality

Constructed with high-quality materials, the DM40 promises durability. While the cloth covering adds a touch of class, it does require careful handling to maintain its pristine appearance over time.

Slim Tower Form Factor

The slim tower design is a double-edged sword; while it allows for an efficient use of space, it also demands careful consideration regarding placement—especially since the included stands might necessitate clearance at the bottom for stability.


Audio Quality Components

Definitive Technology has equipped the DM40 with a combination of 4.5” midrange/midbass drivers and two 1-inch aluminum oxide dome tweeters, along with two 6-inch front-firing subwoofers. This configuration is poised to deliver an expansive soundstage with crisp highs and robust lows.

Connectivity Options

The speaker offers a reasonable range of connectivity options, including digital optical inputs and a subwoofer pre-out, which is especially valuable for users looking to enhance bass output. However, the limited analog input/output may be a downside for those with legacy equipment.

Power and Energy Efficiency

With a power consumption of 70W, the DM40 isn't the most energy-efficient speaker on the market. However, the standby consumption of 0.3W is commendable, reducing concerns about energy waste when not actively in use.

User Interface

The DM40 comes with straightforward controls, including independent subwoofer adjustments, which allow users to tailor the bass to their preference. The inclusion of a programmable timer and sleep timer adds a layer of convenience for daily use.

Additional Functionalities

Comprehensive tone control options offer users the ability to fine-tune audio output, which is critical for matching speaker performance to personal preferences and the acoustics of the listening environment.


Sound Quality

The DM40 shines in its sound quality, delivering an auditory experience that is both immersive and precise. Music across various genres is rendered with clarity, and the speaker presents a balanced profile that neither over-emphasizes the highs nor muddles the lows.

Bass Response

The independent subwoofer controls are a standout feature, allowing for precise bass adjustment. The front-firing subwoofers provide a depth of bass that is impressive for the speaker's slim form factor, though it may not satisfy those seeking the visceral impact of larger standalone subwoofers.

Volume and Power

While the 2 x 30W power output might seem modest, it is more than sufficient for most home environments. The speaker is capable of filling a medium-sized room with sound without noticeable distortion at high volumes.

Frequency Response

The DM40's frequency response is commendably wide, offering detailed audio reproduction from 55 Hz to 23 kHz. This range ensures that the nuances of music and other audio content are captured with fidelity, contributing to a more engaging listening experience.


Installation and Setup

The DM40's setup is relatively straightforward. While its weight of 8.82 lbs requires careful handling, once in place, the speaker is quite user-friendly. Its compatibility with high-quality speaker cables is a boon for audiophiles seeking optimal performance.

Space Considerations

The speaker's slim profile is an advantage for those with limited space, but it's important to note that the tower design may necessitate specific placement to avoid blocking the built-in subwoofers.

Pros and Cons Recap

The DM40 boasts high-quality power output, comprehensive tone control, versatile connectivity, and a sleek design. Yet, it faces limitations such as fewer analog inputs, higher power consumption, and a somewhat limited power output when compared to certain competitors.

Comparison to Competitors

In its category and price range, the DM40 holds its own, especially in terms of design and sound quality. While some competitors may offer more robust power outputs or additional analog connectivity, few match the DM40's balance of features, performance, and elegant design.

Final Thoughts

The Definitive Technology Dymension DM40 Slim Tower Speaker stands out as a sophisticated and capable addition to any home audio setup. Its strengths, particularly in terms of sound quality and design, make it a compelling choice for users looking for premium audio in a compact form. The speaker's few shortcomings are worth considering, but they do not significantly detract from its overall value proposition. Potential buyers, especially those with a penchant for sleek aesthetics and detailed sound, will find the DM40 to be a worthy investment.



  • Dimensions (H x W x D): 37.4 x 10.3 x 10.0 in. (950 x 261 x 255 mm)
  • Weight: 38.1 lbs (17.3 kg)
  • Color: Black
  • Grille Material: Acoustically transparent black cloth
  • Remote Control: RC-1214
  • Power Consumption: 70 W
  • Standby Consumption: 0.3 W
  • Maximum Dimensions: 8.27 x 12.13 x 4.53 in.
  • Weight: 8.82 lbs


  • Tweeter: (2) 1 in. aluminum oxide domes
  • Midrange/Midbass: (4) 4.5 in. woofers
  • Enclosure Type: Ported
  • Bipolar Array: Fully balanced, adjustable
  • Bipolar Array Adjustment: Rear tweeter switch
  • Frequency Response: 38 Hz–30 kHz (-10dB), 55 Hz–23 kHz (-3dB)
  • Nominal Impedance: 4Ω (8Ω compatible)
  • Sensitivity: 87dB (2.83V/1m)
  • Recommended Amplifier Power Rating: 50-250W


  • Analog In/Out: 1/0
  • Digital Optical In: 2
  • Subwoofer PreOut: Yes
  • Speaker Terminal: Screw
  • Headphone Out: Yes


  • CD Compatibility: CD / CD-R/RW / WMA / MP3
  • Made for iPod / iPhone: Yes
  • USB Audio (Front): No
  • iPod / iPhone Compatible USB Input: No


  • Tone Control: Bass / Treble / Balance
  • Clock: Yes
  • Sleep Timer: Yes
  • Programmable Timer: Once / Daily


  • Included Accessories: (4) Adjustable hard floor glides, (4) Adjustable carpet spikes


  • Frequency Range FM: 87.5 MHz - 107.9 MHz
  • Frequency Range AM: 520 kHz - 1710 kHz

Trusted by over
5,500+ customers