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 21" High Performance Carbon Fiber Subwoofer
• Sealed Enclosure Design
• Magnetic Grille included (1-1/2" HDF)
• black textured finish
• (external amplifier required


We're proud to be an authorized dealer of RBH Sound

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.



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.


  • DRIVE UNITS (1) 21" Carbon Fiber Driver
  • UNR 21N-SF/R SERIES Signature Reference Series | Subwoofers SYSTEM TYPE Ultimate Subwoofer System DRIVE UNITS (1) 21" Carbon Fiber Driver ANECHOIC FREQUENCY RESPONSE 12Hz-80Hz ± 3dB
  • FREQUENCY RESPONSE when using DA Series Subwoofer Amplifie
  • AMPLIFIER POWER 4000 Watts Bridged w/ customizable DSP
  • VOLTAGE AC 100 - 240V ~ 50/60Hz
  • CROSSOVER FREQUENCIES 40Hz-180Hz (variable in software)
  • CROSSOVER SLOPE 6dB/Octave-48dB/Octave (variable in software)
  • LFE INPUT XLR, RCA (with adapter) / DSP Mode Switchable
  • PHASE CONTROL 0-180 + delay control (avilable in software)
  • CABINET DETAILS High Density Fiberboard (HDF)
  • Textured Black GRILLE DETAILS
  • FINISHED DIMENSIONS 43" W x 27-1/4" H x 21" D
  • WEIGHT333 lbs (151.05 kg)

Additional Info

WARRANTY*10 year/amp 3 year limited