RBH Sound UNRIVALED 21N-SF/R Infrasonic 21" Home Theater Subwoofer - Dreamedia AV
Vendor: RBH Sound

RBH Sound UNRIVALED 21N-SF/R Infrasonic 21" Home Theater Subwoofer

Unrivaled deep bass with carbon fiber tech

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RBH Sound UNRIVALED 21N-SF/R Infrasonic 21" Home Theater Subwoofer

Unleashing the Power of Sound: The RBH Sound UNRIVALED 21N-SF/R

Imagine a subwoofer that doesn't just play bass but breathes life into every cinematic explosion, every bass guitar strum, and every thunderous footstep in your favorite movie scenes. The RBH Sound UNRIVALED 21N-SF/R is not just a subwoofer; it's an experience, crafted to immerse you in a world where sound is not just heard but felt.

The Heart of the Beast: Unmatched Audio Fidelity

At the core of the UNRIVALED 21N-SF/R lies a massive 21-inch carbon fiber cone driver, engineered for precision and durability. This subwoofer boasts:

  • Sealed Design: For tight, accurate bass without distortion.
  • Massive Cast Aluminum Basket: Ensuring stability and support for the powerful driver.
  • Extreme Driver Excursion: With 38mm Xmax and 50mm Xmech, it can move air like no other, translating to earth-shaking bass.
  • Powerful Neodymium Motor: Creating an intense magnetic flux of 35 Tesla Meters for exceptional control and efficiency.

Amplification That Commands Respect

The RBH Sound UNRIVALED 21N-SF/R is powered by the DA-2602DSP amplifier, a beast in its own right. This 4,000-watt class-D amplifier with DSP control is at the forefront of subwoofer technology, offering:

  • Customizable Audio Settings: Including phase, crossover slope, and delay controls to tailor the sound to your space.
  • 30-Band Equalizer: For the ultimate in fine-tuning, ensuring the best audio experience possible.
  • XLR Inputs and Outputs: Professional-grade connectivity for uncompromised signal quality.

A Fortress of Sound: Robust and Refined Enclosure

Encased in a 43-inch wide cabinet made from high-density fiberboard, the UNRIVALED 21N-SF/R's enclosure is a testament to acoustic excellence. It features:

  • Granular Acoustic Damping System (G.A.D.S.): For dissipating acoustic energy and reducing unwanted resonance.
  • Premium Outriggers: Not just for stability, but also adding an element of style to this audio powerhouse.
  • Heavy-Duty Curved Magnetic Grille: Protecting the driver while maintaining the subwoofer's sleek appearance.

Designed for the Connoisseur

The RBH Sound UNRIVALED 21N-SF/R is a symphony of engineering meant for those who can appreciate the subtleties of high-fidelity sound. Its features include:

  • Wireless Capability: Offering the flexibility of placement without the clutter of cables.
  • Passive and Active Options: Catering to both purists and those seeking the convenience of built-in amplification.
  • Digital Crossover: For seamless integration with your existing audio setup.
  • Compatibility with Legacy Equipment: Ensuring that your cherished old NAD receiver and RBH base amp and speakers can join the modern era of sound.

Installation and Support: The Dreamedia Touch

We at Dreamedia understand that a subwoofer of this caliber deserves expert installation and setup. Our knowledgeable dealer installation team is on hand to ensure that the UNRIVALED 21N-SF/R is perfectly integrated into your home theater system. We provide:

  • Wiring Diagrams and Setup Recommendations: To make installation a breeze.
  • Tailored Advice and Support: Our team is ready to answer your questions and provide guidance.

The Dreamedia Difference: A Seamless Audio Environment

With Dreamedia's expertise, the UNRIVALED 21N-SF/R can be customized to fit your personal needs and lifestyle, creating a sound environment that is uniquely yours. Whether you're enjoying an action-packed movie or relaxing to your favorite jazz album, this subwoofer delivers unparalleled performance.

Key Specifications at a Glance

  • Driver Size: 21 inches
  • Enclosure Type: Sealed
  • Amplifier Power: 4,000 watts (Class D with DSP)
  • Frequency Response: CEA-2010 Burst Output, impressive across sub-bass to mid-bass ranges
  • Connectivity: XLR inputs and outputs, wireless capability
  • Weight: 333 lbs

Elevate Your Listening Experience

The RBH Sound UNRIVALED 21N-SF/R is more than just a subwoofer; it's the cornerstone of an immersive audio experience that brings your home theater to life. With its powerful performance, customizable settings, and the support of Dreamedia's expert team, this subwoofer is the ideal choice for the discerning listener.

A Design That Speaks Volumes

Beyond its acoustic capabilities, the UNRIVALED 21N-SF/R is a statement piece. Its high-quality finishing and robust design add not only aesthetic appeal but also ensure longevity. This is a subwoofer that looks as good as it sounds, ready to complement any high-end home theater setup.

Customer Satisfaction: Our Commitment

We at Dreamedia pride ourselves on delivering not just exceptional products but also unparalleled customer service and support. The positive feedback from our satisfied customers is a testament to our commitment to excellence. With the RBH Sound UNRIVALED 21N-SF/R, you're not just purchasing a subwoofer; you're investing in a legacy of quality sound.

Ready to Unrival Your Expectations?

The RBH Sound UNRIVALED 21N-SF/R is currently in the pre-release stage, which means you have the unique opportunity to be among the first to experience this groundbreaking subwoofer. Contact Dreamedia today to learn more about how you can take your home theater to new heights with the RBH Sound UNRIVALED 21N-SF/R.

Embrace the power, embrace the clarity, embrace the unrivaled experience. Your dream audio environment awaits.

You will be astounded at the depth and realism this powerhouse subwoofer will bring to your viewing and listening adventures. This monster of a subwoofer excels in both movies and music listening with tight and accurate output. The UNRIVALED 21N-SF/R is built like a tank, weighing in at 333 lbs and built with the highest quality materials.

Our Review


The RBH Sound UNRIVALED 21N-SF/R is an impressive subwoofer that promises to deliver a truly immersive home theater experience. With its 21-inch subwoofer and carbon fiber cone, this powerhouse from RBH Sound aims to provide a depth and realism that enhances both movie watching and music listening. In this review, we will delve into the design, performance, features, compatibility, and potential drawbacks of the UNRIVALED 21N-SF/R to help you determine if it's the right fit for your home theater setup.

Design and Build Quality

The UNRIVALED 21N-SF/R is not for the faint of heart, weighing in at a hefty 333 lbs. Its substantial size and weight make it a challenge to move and reposition, so careful planning is required when integrating it into your home theater. However, this weight is a testament to the robust construction and high-quality materials used in its build. RBH Sound has spared no expense in ensuring the durability and longevity of this subwoofer.

In terms of aesthetics, the UNRIVALED 21N-SF/R boasts a sleek and modern design. Its glossy black finish exudes a sense of sophistication and elegance, while the plain grilles add a touch of simplicity. That being said, some users may find the glossy black sideburns on every speaker to be a bit overwhelming and may prefer a more understated look.


When it comes to performance, the UNRIVALED 21N-SF/R truly shines. This subwoofer is designed to deliver a powerful and immersive audio experience. The depth and realism it brings to movies and music are truly impressive. Whether you're watching an explosive action sequence or listening to your favorite album, the UNRIVALED 21N-SF/R adds a level of immersion that can transport you into the heart of the action.

One of the standout features of the UNRIVALED 21N-SF/R is its tight and accurate sound output. The subwoofer excels at reproducing low-frequency sounds with precision, ensuring that every note and rumble is faithfully reproduced. This level of accuracy contributes to the overall quality of the sound and enhances the overall listening experience.

Features and Customization

RBH Sound has incorporated several notable features into the UNRIVALED 21N-SF/R to enhance its versatility and customization options. One such feature is the use of G.A.D.S. (Guided Acoustic Dispersion System) technology. This technology helps to optimize the audio experience by providing a more even and controlled dispersion of sound. The result is a more immersive and consistent listening experience, regardless of where you are positioned in the room.

Additionally, the UNRIVALED 21N-SF/R offers customizable audio environment options. This allows you to tailor the subwoofer's performance to suit your specific room and personal preferences. Whether you prefer a more boomy and impactful bass or a tighter and more controlled response, the UNRIVALED 21N-SF/R can be adjusted to meet your needs.

Furthermore, the UNRIVALED 21N-SF/R offers wireless capability, allowing for flexible placement without the need for long speaker cables. This is particularly useful if you have limited space or prefer a cleaner and more streamlined setup. The wireless capability adds convenience and opens up possibilities for optimal subwoofer placement.

Compatibility and Setup

The UNRIVALED 21N-SF/R is designed to work seamlessly with a variety of equipment. It is compatible with old NAD receivers and RBH base amps and speakers, making it a suitable upgrade for those who already have existing equipment from these brands. RBH Sound provides a wiring diagram, recommendations, and advice for setup, ensuring a smooth integration into your home theater system.

RBH Sound also offers the expertise of their knowledgeable dealer installation team. This team can provide professional installation and setup services, ensuring that the UNRIVALED 21N-SF/R is optimized for your specific room and audio preferences. Their expertise and guidance can be invaluable, especially for those who are new to the world of home theater setups.

Price and Value

The UNRIVALED 21N-SF/R comes with a hefty price tag of $12,000, which may be a significant investment for many potential buyers. However, it's important to consider the overall value proposition that this subwoofer offers. With its impressive performance, high-quality construction, and customizable features, the UNRIVALED 21N-SF/R delivers a top-tier audio experience that is sure to satisfy even the most discerning audiophiles.

Potential Drawbacks

While the UNRIVALED 21N-SF/R offers exceptional performance and features, there are a few potential drawbacks to consider. As mentioned earlier, the subwoofer's weight of 333 lbs can make it difficult to move or reposition. Careful planning and assistance may be required during the initial setup and any subsequent adjustments.

Another consideration is the need for an additional amplifier. To power the UNRIVALED 21N-SF/R, the purchase of the recommended DA-2602DSP subwoofer amplifier is necessary, adding to the overall cost. While this amplifier is optimized for the subwoofer, it is an additional investment that potential buyers need to factor into their budget.

It's also worth noting that the UNRIVALED 21N-SF/R is in the pre-release stage, which may indicate potential changes or uncertainties in the final product. While RBH Sound has a reputation for delivering high-quality products, it's important to keep this in mind and stay informed about any updates or changes that may occur.

Lastly, some users may find the glossy black sideburns on every speaker to be less visually appealing. While aesthetics are subjective, it's worth considering if the design of the UNRIVALED 21N-SF/R aligns with your personal taste and home theater setup.


In conclusion, the RBH Sound UNRIVALED 21N-SF/R is a subwoofer that delivers impressive depth, power, and accuracy. Its high-quality construction, customizable features, and compatibility with old equipment make it a compelling choice for those seeking a top-tier audio experience. However, potential buyers should carefully consider the weight, additional amplifier cost, and pre-release stage of this subwoofer. If the price and potential drawbacks are not obstacles, the UNRIVALED 21N-SF/R has the potential to be a game-changer in your home theater setup.


Technical Specifications

  • Model: UNRIVALED 21N-SF/R Infrasonic 21
  • Weight: 333 lbs
  • Driver Size: 21 inches
  • Driver Material: Carbon fiber cone
  • Xmax: 38mm (one-way linear travel)
  • Xmech: 50mm (one-way mechanically limited travel)
  • Magnetic Flux: 35 Tesla Meters
  • Voice Coil: 4” diameter copper
  • Amplifier Type: DA-2602DSP class-D
  • Amplifier Power: 4,000 watts
  • DSP Control: Yes
  • Equalizer: 30-band
  • Cabinet Width: 43 inches
  • Cabinet Height: 27 inches
  • Cabinet Depth: 21 inches
  • Cabinet Material: High-density fiberboard (HDF)
  • Frequency Response: Flat extension to 10Hz (in-room)


  • Design: Suitable for movies and music listening
  • Bass Output: Deep and realistic
  • Accuracy: Tight and accurate output
  • Construction: High-quality materials, heavily-braced cabinet
  • Damping System: G.A.D.S. (Granular Acoustic Damping System)
  • Stability: Premium outriggers
  • Protection: Heavy-duty curved magnetic grille
  • Customization: Different enclosure sizes and porting options
  • Additional Amplifier Option: Built-in plate amp or outboard amp for rack-mounting


  • CEA-2010 Output: Data provided by RBH Sound
  • Infrasonic Bass: Capable of producing powerful infrasonic bass

Construction and Design

  • Build Quality: Built like a tank with high-quality materials
  • Handcrafted: Precision-built by hand in the Pacific Northwest
  • Low Distortion: Innovative design with low distortion

Compatibility and Service

  • Audio Environment: Home Theater, Living Room, Apartment, Outdoor, Recording Studio, Custom/Other
  • Dealer Installation: Knowledgeable installation team
  • High-Quality Service: Includes wiring diagrams, recommendations, and setup advice
  • Compatibility: Connects with older NAD receiver and RBH base amp and speakers
  • Sound Quality: Maintains high quality with older equipment

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