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Metasonix KV-100 The Assblaster!

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Page last updated Mar 30, 2026

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For those seeking the unconventional in sound manipulation, the Metasonix KV-100 The Assblaster! is a true maverick in the world of multi-effects pedals. Known for its all-tube signal path, this pedal offers an audacious blend of distortion, filtering, and modulation, making it a formidable tool for sonic experimentation. Unlike traditional pedals, the Assblaster takes a bold approach by utilizing vacuum tubes to generate its unique and unpredictable tones. Built for musicians who thrive on pushing boundaries, this pedal is perfect for guitarists and synth enthusiasts alike who wish to explore new auditory landscapes.

The KV-100 features a combination of distortion, ring modulation, and envelope following, allowing for a wide array of sound shaping capabilities. Its rugged build ensures it withstands the rigors of both studio and stage environments. The Assblaster is not for the faint-hearted, with its ability to produce anything from subtle warmth to extreme sonic chaos. With its integrated spring reverb, it adds a layer of depth and dimension that can elevate any performance or recording session.

Whether you're looking to add texture to your guitar riffs or completely transform your synth lines, the Metasonix KV-100 The Assblaster! offers a unique arsenal of effects that is both versatile and distinctively character-rich.

Key Features:

All-tube signal path for unique tone generation
Integrated spring reverb
Combination of distortion, ring modulation, and envelope following effects
Rugged construction for durability
Ideal for guitarists and synth players seeking unique soundscapes

Videos

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Nico Levy

Metasonix KV-100 "The Assblaster" demo.

Nico Levy

NAMM 2009 - Metasonix KV-100 AssBlaster at Big City Music booth

bigcitymusic

Metasonix KV-100 Assblaster beats @ NAMM 2009

arrowbang

Metasonix KV100 Assblaster (Ahem) Tears It Up At Winter NAMM 2008

gearwire

POE's HOUSE - Metasonix KV100 AssBlaster with Animoog on iPad as a MIDI control

Ritchie DeCarlo

Metasonix KV 100 ASSBLASTER w MOOG DFAM & T Rex Tape Echo

Ritchie DeCarlo

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Metasonix KV-100 The Assblaster!.

Build quality

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Vacuum tubes like the 6CB6 used in the Assblaster are robust and can handle higher voltages than typical silicon parts, reducing the risk of explosion.
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Features and functionality

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The KV-100's preamp includes input signal adjustment, output level adjustment, and screen voltage adjustment for V2, allowing for increased overdrive distortion without excessive loudness.
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Setup and maintenance

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A fixed 12V power supply with at least 300mA output is essential for the filaments, alongside a B+ supply to fit within the suggested voltage range.
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User experience

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The original KV-100 experienced a ground hum issue, which can be mitigated by converting the power supply from AC to DC.
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Critic Reviews

Metasonix KV-100 The Assblaster! review on pedal-of-the-day.com

pedal-of-the-day.com

The Metasonix KV-100 "The Assblaster" is a one-of-a-kind effects system that blends chaos with creativity in a way that challenges conventional distortion pedals. This yellow beast is packed with unpredictable, unique sounds that are impossible to replicate, thanks to its combination of Metasonix’s classic vacuum-tube circuits. It offers a wide range of modulation and sound design options, pushing it beyond the capabilities of its competitors. However, its unpredictable nature may not suit everyone, especially those looking for consistency. Overall, it's a wild ride for those daring enough to explore its potential.

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