Audiostorm is a British boutique builder of guitar effects pedals and amplifier attenuators, founded in 2008 by Sean Mandrake and hand-built in Manchester, UK. The company is known for its HotBox series of reactive power attenuators (including the HotBox 120 and HotBox 130 Reactive) and its Reactive Load unit, which are widely used by valve-amp players for silent recording and bedroom-level playing.

The pedal range covers overdrive, distortion and utility boxes such as the Grand Classic high-gain distortion, the Otherworld Overdrive, the Tone Lord clean boost, the Quad Screamer multi-mode germanium/MOSFET overdrive, and the Trident ABW transformer-isolated splitter. Audiostorm also produces recording tools like the Silent Recording Kit and Direct Recording Box, plus a range of handy boxes, EQ modules and volume controls.

The company emphasizes point-to-point wiring and mil-spec components, and has developed its own in-house 'pick-and-place' assembly process using 3D-printed tooling. New products are often launched via Kickstarter campaigns under founder Sean Mandrake, who also runs a companion site at seanmandrake.com covering the same gear.

Audiostorm has 3 products cataloged on Equipboard, including Audio Interfaces, Guitar Power Attenuators, and Boost Effects Pedals.