The BIAS Rack by Positive Grid provides literally endless tone possibilities! You can capture any amp tone in the world or design unique custom amps from the ground up and take them out to the studio or on tour. Designing your dream amp component by component is a breeze with BIAS Amp, and it’s even easier to take it out on tour loaded on BIAS Rack. And when it’s time to record or practice in the comfort of your home or hotel room, your custom amps are still at your fingertip in your notebook and iPad.

See how All That Remains bassist Aaron Patrick uses the BIAS Rack on stage:


BIAS Rack is a rackmount guitar and bass amplifier that accurately captures any amp tone in the world, including the cab and even mic position. You can safely connect your cab into its powerful Class D 600 Watt RMS @ 8 Ohm. With the included BIAS Amp Pro software, you can share and download thousands of amp match models and save them right in the rack.

New Kind of Amp

Hardware and software beautifully integrated, BIAS Rack allows you to design and match any amp tone on the fly, share and download Amp Match models in the cloud, and use that massive tone on a full-blown 600w RMS power amp.

Amp Match and ToneCloud

BIAS Rack comes with Amp Match(R) technology, which lets you precisely match the nuanced tone of any classic, modern or boutique amp and load custom cab and mic responses. You can share or download thousands of Amp Match models from ToneCloud.

Premium Components

The… read more op-amps, passive components and A/D and D/A converters used are all top of the line. BIAS Head’s power amp is optimized to perform any BIAS Amp presets at the highest audio quality possible at any volume. It also provides zero latency performance due to its built-in interface.

Insane Possibilites

The world's first cross-platform guitar amplifier, BIAS Rack integrates seamlessly with BIAS Amp for mobile and desktop use: you can design your custom amp and create Amp Match models in real time.

Amp Design

Design your custom dream amp and sync unique presets in real time. Swap out the virtual tube types, preamp, transformer, tone stacks, cab and mic position to create your own signature sound, with just a few taps or mouse clicks.

Thousands of Amps

Download thousands of Amp Match(R) models created by legendary recording artists and your fellow guitarists on ToneCloud, and sync the entire collection across your desktop and mobile devices and BIAS Head in a snap. read less