The Avalanche – 12 Inch Active Subwoofer | Unity Audio



THE AVALANCHE – ACTIVE 12INCH SUBWOOFERThe Avalanche active sub-woofer is primarily designed to compliment our 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 circuitry 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 footswitch is also included to allow users to switch the sub-woofer in or out of circuit.



Unity Audio

Unity Audio has been at the leading edge of monitor design for many years. We pride ourselves in taking a fresh approach to designing and manufacturing products, using different materials in innovative ways. We source quality components from reputable companies, working with skilled craftsmen, incorporating new ideas on traditional designs, in order to fine tune our products. Every Unity Audio product has been designed, built and tested all in the UK.

Used by the world's best artists

Unity Audio active monitors are used by the world’s best audio engineers, producers, Grammy award-winning artists, film composers, broadcasters, universities, mastering engineers and home studios.

Additional information

Price Bracket


300mm (12”) Woofer
Sealed Aperiodic Vent Cabinet Design
22Hz-120Hz Frequency Response
2 x Discrete A/B Amplifiers by Esoteric Audio Research (200s watt total)
2 x Balanced XLR Inputs, 2 x Balanced XLR Outputs
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


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