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RBH Sound’s Unrivaled 21-SF/R 21-Inch Subwoofer Is A Monster

At nearly $12,000, RBH Sound’s 21-inch 4,000-watt subwoofer will rattle your bones down to 12Hz!

RBH Sound Unrivaled 21- SF/R Subwoofer

Utah-based RBH Sound has a reputation for making high performance loudspeakers, but they have outdone themselves with their new Unrivaled 21-SF/R 21-inch subwoofer. This subwoofer is not only big but carries a $12,000 price tag. Still interested? Let’s see what it has to offer. 


The RBH Sound Unrivaled 21-SF/R utilizes a 21-inch driver, designed exclusively for RBH by Pierce Audio. Pierce Audio has built subwoofers and precision hand-made speaker drivers in the Pacific Northwest since 2004. 

The UNR 21-SF/R is a passive subwoofer that incorporates a sealed enclosure design with a 21-inch high-performance carbon fiber cone, magnetic grille, black textured finish and weighs 333 lbs.

The UNR 21-SF/R is designed to push the boundaries of what RBH Sound currently offers. The carbon fiber cone falls in line with the design philosophy of RBH Sound products, providing a rigid and lightweight cone material for fast and accurate reproductions of their given frequency range.

RBH has also included its G.A.D.S. (granular acoustic damping system) technology to add needed damping and rigidity to balance with the power of the 21-inch driver creating an inert cabinet that allows the 21-inch driver to move a lot of air.

To power the subwoofer, RBH recommends the DA-2602DSP subwoofer amplifier which provides the power to properly drive the UNRIVALED 21-SF/R. With 4,000 watts of power available in bridged mode and 30 bands of parametric EQ on board, the DA-2602DSP and the UNRIVALED 21-SF/R pair are designed to be the perfect match.


  • Cabinet Construction: High-Density Fiberboard (HDF) Sealed
  • Driver:  (1) 21″ Carbon Fiber Driver
  • SPL: 120 dB Max
  • Frequency Response (Anechoic): 12Hz-80Hz ± 3dB
  • Sensitivity: N/A
  • Impedance: 4 ohms
  • Power Handling: 4,000 watts
  • Speaker Grille: Magnetic (black fabric)
  • Finish: Textured Black
  • Dimensions (WHD):  43 x 27-¼ x 21 -inches (1092 x 692 x 533 mm)
  • Weight: 333 lbs (151.05 kg)
  • Warranty: 10-year limited

DA-2602DSP Subwoofer Amplifier

In order to drive the Unrivaled 21-SF/R RBH recommends its external dedicated DA-2602DSP subwoofer amplifier which is optimized for its subwoofer products. 

RBH Sound DA-2602DSP Amplifier Front
RBH Sound DA-2602DSP Subwoofer Amplifier Back

The DA-2602DSP provides the power to deliver deep accurate bass for music or home theater systems. This amplifier also incorporates parametric EQ and shelving filters that allow users to custom-tune the bass to match their room’s characters. The heavy-duty power supply and Class D output stages provide enough power to drive the most demanding subwoofer.


  • Amplifier Type: High-Efficiency Class D w/DSP
  • DSP Module: 2-channel DSP 24bit/96khz
  • Power Output (8 ohms): 2 x 1300 Watts
  • Power Output (4 ohms): 2 x 2200 Watts
  • Power Output (8 ohms Bridged): 1 x 2600 Watts, 4000 Watts Peak
  • Frequency Response: 20Hz – 1kHz (+/- 0.5dB) with variable Low & High Pass Filters
  • THD% 1/8 RMS at 1kHz: <0.05%
  • Damping Factor: >300
  • Equalizer: 30 Band Parametric Equalizer (PEQ)
  • DSP: 24 bit/96 kHz
  • Crossover Frequency: 40Hz-180Hz (variable in software)
  • Crossover Slope: 6dB/Octave-48dB/Octave (variable in software)
  • Phase Control: 0-180 + delay control (available in software)
  • Input Connections: XLR, (RCA with Adapter)
  • Output Connections: Traditional Binding Posts, Neutrik SpeakOn
  • Input Impedance: Balanced at 20K Ohms
  • Onboard Cooling System:  Low noise, Variable speed fans; air flows front to rear
  • Protection Profile: DC protection, Undervoltage protection, Smart overheat management, Soft startup protection, Output overload protection, Input/Output Limiters (DSP adjustable)
  • Power Supply: AC 100 – 240V ~ 50/60Hz
  • Rack Mounting: 2 U Rack Space
  • Dimensions (WHD): 19 x 3.875 x 11.5-inches (483 x 98.5 x 292mm)
  • Weight:  15.4 lbs (7.0 kg)
  • Warranty: 1 year (manufacturer defects)
RBH Sound Unrivaled 21- SF/R Subwoofer with grilled black

Price and Availability

The RBH Unrivaled 21-SF/R is priced at $9,995 and the DA-2602DSP is priced at $1,950 (the price for both together is $11,945). Both products are available through the RBH Authorized Dealer and Distributor Network

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  1. ORT

    August 4, 2023 at 3:12 pm

    As Bernard Lee (as “M”)looking at the espresso machine, asked of Bond in “Live And Let Die”:

    “Is that all it does?”

    Unrivaled indeed.


    • Ian White

      August 4, 2023 at 4:04 pm


      Imagine 4 of those. Come on MegaMillions.


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