Vendor: RBH Sound


21-inch subwoofer with advanced DSP and robust build

RBH Sound Authorized Dealer


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Unmatched Power and Precision

Step into a world where the bass is not just heard but felt, where every beat of music and every rumble in a movie soundtrack is experienced with a visceral intensity that's nothing short of breathtaking. The RBH Sound UNRIVALED 21-SF/R Ultimate Subwoofer System represents the pinnacle of subwoofer design, delivering unparalleled power, precision, and auditory impact.

Engineered for Excellence

This subwoofer isn't just assembled; it's crafted. With a 21" proprietary driver designed through a collaboration between RBH Sound and Pierce Audio, you're not just getting a speaker; you're getting a masterpiece of audio engineering. The carbon fiber cone ensures rigidity and low distortion, while custom machine work exemplifies precision and quality.

Robust Construction

The RBH Sound UNRIVALED 21-SF/R is built to last, featuring:

  • High-Density Fiberboard (HDF) Enclosure: Heavily-braced and durable, this enclosure is designed to withstand the sheer force of the subwoofer's output while minimizing any potential resonance.
  • Granular Acoustic Damping System (G.A.D.S.): In place to dissipate acoustic energy effectively, ensuring clean, tight bass.
  • Premium Outriggers: These provide stability and a stylish footprint, complementing the aesthetics of any room.
  • Magnetic Grille: A heavy-duty curved grille protects the driver without compromising on sound quality.

Advanced Driver Specifications

The heart of the UNRIVALED 21-SF/R is its massive 21" carbon fiber cone driver, boasting:

  • 38mm Xmax and 50mm Xmech: These specifications allow for extraordinary linear and mechanical travel, resulting in deep, impactful bass.
  • Eight Neodymium Slugs: Providing a powerful magnetic flux of 35 Tesla Meters for efficient and dynamic bass response.
  • 4" Diameter Copper Voice Coil: Ensures excellent thermal capacity and durability.

Amplifier Specifications

Powering this beast is the RBH DA-2602DSP amplifier, a powerhouse of technology that includes:

  • 4,000-watt Class-D Amplification: Offering immense power to drive the subwoofer with ease.
  • DSP Control: Allows precise tuning of phase control, crossover slope, delay, and more.
  • 30-Band Equalizer: For meticulous calibration to match any room or preference.

Performance That Resonates

When it comes to performance, the UNRIVALED 21-SF/R is in a class of its own:

  • Low-Frequency Output: Delivers deep bass and infrasonic ranges that you can feel in your bones.
  • Mid-Bass Punch: Not only does it excel in the lows, but it also provides a significant mid-bass presence.
  • In-Room Extension: Capable of reaching down to 10Hz, it provides an almost tactile experience of sound.

Versatility and Customization

The RBH Sound UNRIVALED 21-SF/R is versatile enough to enhance any audio experience:

  • Movies and Music Listening: Whether you're immersing yourself in the latest blockbuster or enjoying your favorite symphony, this subwoofer transcends mediums.
  • Customization Options: Choose between built-in plate amp or outboard amp for rack-mounting, as well as enclosure sizes and porting to fit your specific needs.

Durability and Longevity

With RBH's legacy of designing and engineering superior acoustic products since 1976, durability is a given:

  • High-Quality Materials: Ensures the subwoofer system stands the test of time.
  • Careful Tuning: DSP calibration is fine-tuned to extract the optimal sound from the subwoofer, ensuring longevity in performance.

Installation and Support

Dreamedia is here to help design and install your home theater system, ensuring the RBH Sound UNRIVALED 21-SF/R Ultimate Subwoofer System integrates flawlessly into your space:

  • Authorized Dealers: Purchase with confidence through authorized RBH Sound dealers.
  • Expert Advice: Dreamedia's knowledgeable experts are available to assist you in making the most of your investment.

Pricing and Availability

Starting at $10,000, this subwoofer represents a significant investment in audio excellence:

  • Pricing Options: Various customization options are available to ensure you get exactly what you need.
  • Availability: Contact your authorized RBH Sound dealer to discuss availability and installation options.

The Dreamedia Difference

At Dreamedia, we understand the importance of a well-designed home theater system, and the RBH Sound UNRIVALED 21-SF/R Ultimate Subwoofer System is a testament to our commitment to excellence. Our experts are ready to assist in designing a system that not only meets but exceeds your expectations. With our support, you can experience the power and precision of this extraordinary subwoofer in the comfort of your own home.

Experience the Unrivaled

The RBH Sound UNRIVALED 21-SF/R Ultimate Subwoofer System is not just a purchase; it's an investment in unparalleled audio performance. With its combination of power, precision, and versatility, it stands ready to redefine your home theater experience. Contact Dreamedia today, and take the first step towards audio perfection.

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 21-SF/R is built like a tank, weighing in at 371 lbs and built with the highest quality materials.  The UNRIVALED 21-SF/R includes our DA-2602DSP with carefully tuned DSP calibration to extract every ounce of performance that this monstrous subwoofer is capable of.

The 21" proprietary driver was co-engineered by RBH Sound and Pierce Audio. This groundbreaking, low-distortion design made exclusively for RBH features a carbon fiber cone, shorting cap, copper sleeve and custom machine work. Pierce Audio, a privately held company, has built precision subwoofer and speaker drivers by hand in the Pacific Northwest since 2004. They innovate and engineer the highest quality and resilient subwoofer and speaker drivers for most any application.

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General Specifications

  • Model: UNRIVALED 21-SF/R
  • Type: Ultimate Subwoofer System
  • Application: Suitable for both movies and music listening
  • Output: Tight and accurate
  • Construction: Built with the highest quality materials
  • Manufacturer Collaboration: Pierce Audio
  • Manufacturing Location: Hand-built in the Pacific Northwest since 2004
  • Innovation: Groundbreaking, low-distortion design
  • Performance: Capable of extracting every ounce of performance
  • Resilience: Engineered for high quality and resilience
  • Usage: Suitable for most any application

Driver Specifications

  • Size: 21 inch
  • Material: Carbon fiber cone
  • Features: Massive cast aluminum basket, Half-roll rubber surround, 38mm Xmax (one-way linear travel), 50mm Xmech (one-way mechanically limited travel), Eight neodymium slugs for the magnet, Magnetic flux of 35 Tesla Meters, 4" diameter copper voice coil wound on an aluminum former, Vented pole piece for cooling, Aluminum shorting ring and full-length copper sleeve to mitigate inductance

Amplifier Specifications

  • Model: DA-2602DSP
  • Type: 4,000-watt class-D amplifier
  • Features: DSP control with phase control, crossover slope control, delay control, XLR inputs and outputs, 30-band equalizer for precise system tuning

Enclosure Specifications

  • Design: Sealed
  • Grille: Magnetic grille included (1-1/2" HDF)
  • Dimensions: 43" wide, 27" high, 21" deep
  • Material: High-density fiberboard (HDF)
  • Damping System: G.A.D.S. system (Granular Acoustic Damping System) with chambers for dissipating acoustic energy
  • Outriggers: Premium outriggers for a stylish footprint
  • Grille: Heavy-duty curved magnetic grille for driver protection

Performance Specifications

  • CEA-2010 Output: 2-meter, RMS at various frequencies
  • Bass Output: Capable of providing significant infrasonic bass output
  • Frequency Extension: Flat in-room extension down to 10Hz
  • SPL: Capable of achieving triple-digit SPLs in single-digit frequencies with room gain

Additional Features

  • Amplifier Options: Available in versions with built-in plate amp or outboard amp for rack-mounting
  • Customization: Customizable to different enclosure sizes and porting options


  • Weight: 371 lbs

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