The Avalanche

Availability: In Stock

The Avalanche active suub-woofer is primarily designed to compliment existing Rock and Boulder models, seamlessly transforming them into full range 3-way and 4-way systems and extending their low frequency performance down to an incredible 22Hz. It is also the perfect 2.1 or 5.1 partner in a surround-sound setup to The Rocks and Boulders.


The Avalanche uses a downward firing 300mm woofer, designed exclusively for heavy-duty sub-woofer applications. The input circuity uses two balanced XLR inputs feeding Burr Brown op amps to maintain the best possible quality audio signal which passes through to the satellite speakers

Sealed Cabinet

The Avalanche retains the sealed cabinet design approach but features a dual-chamber with an Aperiodic Vent.This delivers all the benefits of a sealed cabinet such as zero port noise and tight fast accurate bass reproduction. It also significantly increases the bass response available from a smaller cabinet design.


Two Unity Audio low frequency custom discrete Class A/B amplifiers running in parallel delivering an effortless 150 watts are mounted on rubber isolation mounts.


User controls consist of level, 180-degree phase switch,bypass switch, and a switched rotary satellite crossover frequency selector. Two factory presets are provided for teaming up with The Rock or Boulder.In addition, both Low Pass 4th order filter and High Pass 2nd order filters can be set independently in Vari Mode. A bypass foot-switch is also included to allow users to switch the sub-woofer in or out of circuit.

  • 300mm (12") Woofer
  • Sealed Aperiodic Vent Cabinet Design
  • 22Hz -120Hz Frequency Response
  • 2 x Discrete A/B Amplifiers by Esoteric Audio Research(200 watts total)
  • 2 x Balanced XLR Input, 2 x Balanced XLR Output
  • Active Crossover with Rock and Boulder Pre-sets
  • Variable Low and High Pass Filters
  • Gain and Phase Invert Controls
  • Remote XLR Bypass Foot-Switch Included
  • 430mm D x 430mm W x 540mm H
  • 17" D x 17" W x 21.3" H