RBH The 33 – 33" Passive Subwoofer + 12K-420U Amplifier

RBH The 33 – 33" Passive Subwoofer + 12K-420U Amplifier

With real-world infrasonic performance, The 33 produces tight, accurate bass response that you not only hear but viscerally feel. The combination of advanced driver technology and a meticulously engineered enclosure, coupled with the included 12K-420U 12,000-watt amplifier, provides an experience unlike anything achievable from lesser subwoofer systems. With true extended linear performance, massive SPL output is achievable not just at infrasonic frequencies, but throughout the entire LFE bandwidth.

• (1) 33" Long Throw Carbon Fiber Cone Woofer
• Includes RBH 12K-420U: 12,000 Watt 4-Channel Class D Amplifier with DSP
• 7Hz–120Hz (±3dB) Frequency Response
• HDF (High Density Fiberboard) and High Density Polymer Cabinet
• 2Ω + 2Ω Impedance
• 92dB Sensitivity
• 900 lbs (408.23 kg) Weight
• Made in USA
• 10 Year Limited Warranty (with registration within 90 days) / 3 Year Limited Warranty – Amplifier (with registration within 90 days)

Highlights & Key Technologies

33" Long Throw Carbon Fiber Cone Driver
The 33 is built around RBH's proprietary 33-inch long throw, gloss acrylic-coated sandwiched carbon fiber cone woofer, housed in a heavy duty cast aluminum basket and driven by Neo Magnet Stacks. With a 50mm linear Xmax and a 150mm Xmech, the driver displaces copious volumes of air, producing a monstrous sensation of impact at frequencies that are felt, rather than heard. An anechoic –3dB response of 7Hz delivers deep single-digit frequency extension, representing performance equivalent to three UNRIVALED 21s operating simultaneously. The driver's 12,000 watt thermal capability supports sustained high-output operation with a smooth and linear response across the full LFE bandwidth.

G.A.D.S., Cabinet Construction & Outriggers
The 33's thick HDF (High Density Fiberboard) and high density polymer cabinet is manufactured in the USA, with walls filled with RBH's Granular Acoustic Damping System — G.A.D.S. (patent pending). The enclosure is finished in Satin Black or Satin White and is supported by solid steel bar outriggers. Each unit is individually hand assembled and tested.

12K-420U Amplifier
The included 12K-420U is a high efficiency 4-channel Class D amplifier with integrated DSP, delivering 12,000 watts of total output — sufficient to simultaneously power four UNRIVALED 21s. Each channel produces 2,000 watts at 8Ω, 3,000 watts at 4Ω, and 4,000 watts at 2Ω, with a bridged output of 6,000 watts per channel at 4Ω. The amplifier is 2Ω stable and is housed in a 2U rackmount chassis with a touchscreen display. The power supply accepts AC 110–240V ~ 50/60Hz and ships with a 6-20P 240V connector.

Web-Based DSP & Signal Processing
The 12K-420U accepts both AES digital and XLR analog inputs and outputs. AES digital connectivity eliminates the noise and artifacts of analog-to-digital conversion, feeding a pristine signal directly into the DSP engine. The integrated DSP provides 30 bands of parametric EQ, 0 and 180 degree phase control with adjustable delay, limiters, dynamic EQ, and a variable crossover slope of 6–48dB/octave at variable frequencies. Variable phase control is additionally available as a system-level feature. All DSP parameters are accessible via a web-based GUI from any device, complementing the onboard touchscreen display.

Timbre Matching & System Integration
The 33 provides timbre matched options for multi-channel sound across all cabinet products in the RBH Sound family.

Details & Specifications

THE 33 – SUBWOOFER

MODEL INFORMATION
Model Name: The 33
System Type: Ultimate Subwoofer System
Series: 50th Anniversary

PERFORMANCE
Frequency Response: 7Hz–120Hz (±3dB)
Anechoic –3dB Response: 7Hz
Sensitivity: 92dB
Linear Xmax: 50mm
Xmech: 150mm

DRIVER
Drive Units: (1) Long Throw RBH 33" Carbon Fiber Cone Woofer
Woofer Protection: DSP Limiters

CROSSOVER
Crossover Frequencies: Variable
Crossover Slope: 6–48dB/Octave

ELECTRICAL
Amplifier Power: 12,000 Watts
Impedance: 2Ω + 2Ω

INPUTS, OUTPUTS & FEATURES
Features: XLR and AES Inputs/Outputs, Variable Phase Control, Web Based DSP

CABINET
Enclosure: HDF (High Density Fiberboard) and high density polymer
Finish: Satin Black or Satin White
Grille: N/A

PHYSICAL SPECIFICATIONS
Dimensions (H × W × D): 39-3/16" × 60" × 29" (995 × 1524 × 737mm)
Weight: 900 lbs (408.23 kg)

WARRANTY
10 Year Limited Warranty (with registration within 90 days)

12K-420U – INCLUDED AMPLIFIER

MODEL INFORMATION
Model Name: 12K-420U
Amplifier Type: High Efficiency Class D w/DSP
Series: UNRIVALED

PERFORMANCE
Frequency Response: 10Hz–1kHz (±0.5dB) with variable Low & High Pass Filters
Damping Factor: >5000

POWER OUTPUT
Number of Channels: 4
Power Output @ 8Ω: 2,000 Watts/channel
Power Output @ 4Ω: 3,000 Watts/channel
Power Output @ 2Ω: 4,000 Watts/channel
Power Output Bridged @ 4Ω: 6,000 Watts/channel

INPUTS & OUTPUTS
Inputs/Outputs: AES Digital Input/Output; XLR Analog Input/Output

FEATURES / DSP
Features: 30 bands of PEQ; 0, 180 degree phase control plus adjustable delay; limiters; dynamic EQ; touchscreen display; web based GUI

POWER SUPPLY
Power Supply: AC 110–240V ~ 50/60Hz; Comes with 6-20P 240V connector

PHYSICAL SPECIFICATIONS
Rack Space: 2U
Dimensions (H × W × D): 3-15/32" × 19" × 21-9/16" (88 × 482 × 548mm)
Weight: 36 lbs (16.4 kg)

WARRANTY
3 Year Limited Warranty (with registration within 90 days)