Positive Grid BIAS Rack Amp Match Rackmount Preamplifier

Rackmount Guitar Preamplifier with Amp Match Technology and Integration with BIAS Amp Pro Software and BIAS Amp App
Positive Grid BIAS Rack Amp Match Rackmount Preamplifier image 1
Positive Grid BIAS Rack Amp Match Rackmount Preamplifier image 1

Or just $42/month§ for 24 months

0% interest for 24 months*. 24 equal monthly payments required. Valid through 6/25/2017. Learn more

Or make 3 easy payments of $333.00/month!

Plus $10 processing fee. Use any credit card! Sweetwater's Flexible Payment Plan lets you get your gear now and stretch your payments over time. Plus, we won't charge interest! Learn more

In Stock!
Available for immediate delivery!

Share this with your friends:

Most popular accessories & related items...

Positive Grid BIAS Rack Amp Match Rackmount Preamplifier
In Stock!

Unlimited Amp Modeling Potential

The Positive Grid BIAS Rack Processor is ready to re-create any guitar amplifier ever made, right down to the component level. This modeling preamp is based on the powerful amp modeling capabilities of BIAS Amp Pro software (included), and is perfect for creating any guitar tone you could ever need in the studio. It's a great way to go direct to the sound system for live performance, or connect it to a power amp and speaker cabinet of your choice for explosive tone onstage. Thanks to BIAS's Amp Match technology, you can capture the character of your own amplifiers and load them into your BIAS Rack Processor for instant recall, and you can explore thousands of Amp Match presets on the BIAS ToneCloud created by players worldwide. Whether you're practicing, recording, or performing, the Positive Grid BIAS Rack is an outstanding solution for wide-ranging tone.

A Gig-ready Preamp with the Flexibility of Software

Seamlessly integrates with BIAS Amp Pro software and app

As part of the BIAS ecosystem, BIAS Rack Processor is designed to be an extension of the acclaimed BIAS Amp Pro software (included) and the BIAS Amp app. Use the software to create your own custom amplifiers, tone presets, and Amp Match models, then load them into BIAS Rack Processor's 25 preset slots. It comes loaded with 25 great tones to get you started, ranging from sweet clean sounds to aggressive high-gain tones.

Design your own custom amplifiers

Use the included BIAS Amp Pro software to create your own custom guitar amplifiers, then load them into the BIAS Rack Processor. You control the number and type of preamp tubes, transformers, tone stacks, speaker cabinet emulation, and even virtual microphone position. Keep your new secret sonic weapon to yourself, or add it to the thousands of custom amp models available on the BIAS ToneCloud.

Easy to upload new tones, even onstage

It's easy to update the presets in your BIAS Rack Processor. At home or in your studio, just connect the BIAS Rack Processor to your computer via USB to upload new tones. And it can connect to your iOS device via Bluetooth, allowing you to make last-minute changes to your presets using the BIAS Amp app even if you're at the gig away from your computer.

Re-create Tones with Amp Match

Capture the tone of any amplifier

Using the BIAS Amp Pro software, you can capture the sound of real amplifiers and put them in your BIAS Rack Processor. It's a great way to take the sound of your prized amplifier onstage while leaving it safely at home, and also a smart solution for matching recorded guitar tones, too.

Amp Match re-creates tones fast

Matching a guitar tone with BIAS Amp Pro is easy - all you need is a recording of the amp or guitar tone you're trying to re-create. Then you create a similar amp in the BIAS Amp Pro software as a starting point, tell it to match it to the recorded guitar tone, and it'll tweak your custom amp to sound like the target amplifier. You can then use the preset within the software, or load it as a preset in the BIAS Rack Processor.

Download custom amp models on BIAS ToneCloud

Visit the BIAS ToneCloud to access thousands of custom amp models created by signature recording artists and other guitarists around the globe. You can also upload your own custom amp models to share your tone with the world.

Positive Grid BIAS Rack Processor Features:

  • Rackmount guitar and bass preamplifier offering full integration with BIAS Amp Pro software and BIAS Amp app
  • Stores 25 presets at a time for instant recall
  • Create your own custom amplifier designs using the included software
  • High-quality components for outstanding audio quality and zero-latency performance
  • Amp Match technology allows you to re-create the character of recorded guitar tones
  • Explore thousands of custom Amp Match presets via ToneCloud
  • Ideal for performance, recording, and practice
  • Integrates with BIAS Amp Pro software via USB, and with the BIAS Amp iOS app via Bluetooth
  • Effects loop with switchable series/parallel operation for integrating your effects pedals
  • Direct outputs for connecting to sound systems or recording devices
  • MIDI in/out/thru for connecting with MIDI equipment

Additional Media

Guitar Amp Buying Guide

Tech Specs

Type Hybrid hardware/software guitar preamp system
EQ 3-band EQ
Amp Modeling Yes, loaded with 25 presets (download more with Bias Amp software Mac/PC)
Number of Models Load and configure tube types, transformers, cabs, tone stacks and more
Inputs 1 x 1/4" (instrument)
Outputs 2 x XLR (balanced line out), 2 x 1/4" (line out), 1 x 1/4" (headphones)
Effects Loop Yes
MIDI I/O In/Out/Thru
USB 1 x Type B
Footswitch I/O 2 x 1/4"
Bluetooth Yes, Bias Amp app for iOS 8.0 or later
Computer Connectivity USB
Height 3.5"
Width 19"
Depth 13.5"
Weight 15 lbs.
Manufacturer Part Number Bias Rack Processor

Customer Reviews


Positive Grid Bias Amp Rack Processor

This is one of the most awesome pieces of gear that any guitarist or bassist should have! This blows all the other amp modelers out the door! It's versitility is unmatched! Love it!
Music background: Studio Musician

Killer preamp!

After sampling the possibilities from Positive Grids iPad apps like Bias FX and Bias Amp, I was interested in upgrading my older digital preamp (ADA MP-1 Classic). I had a great experience dialing in my favorite tones straight away with the iPad apps so I figured the Rack unit & software would be a killer upgrade for my live sound and also serve as a flexible recording tool. The software was easy to install and getting tones dialed in quickly was no problem. I'm the type of guitar player that likes to tweak each aspect of my sound, so being able to spec out my favorite amp head and characteristics was very exciting for me. Right away I love the glassy and spongy tones like Vox AC30 combo types and Fender tweed sounds that sound really nasty with my Tele and Les Paul. My signal chain is now super simple, I plug into the Bias Rack and go straight into the Marshall EL34 100/100 dual mono bloc power amp and into my Marshall 1960TV cab w celestion greenbacks. I'm also able to control the whole thing from my Voodoo Labs Ground Control floor unit just like my old setup. Combined with Positive Grid's effects, you have endless possibilities in terms of creating the sound you want. It allows me to taylor tones for each of my guitars without having to buy a fleet of amplifiers to carry along with them. The only thing I would change are the front LED lights, there are a bit too bright in dark lighting, so trying to read the front panel to make an adjustment is kinda hard. But once I had everything saved into presets, I didn't need to change much. The best part about this Rack is the customization via laptop. I also thought the tone had more punch and low end compared to the Fractal unit. If you want endless tone shaping but an easy to use interface, definitely get this preamp! Especially if you're running it direct to FOH or for recording. Also, their customer support team was super helpful and responsive. Felix helped me out with my purchase and software install. Great team!

Decent but not worth the money

I will start by saying I run BIAS FX & BIAS AMP on my Ipad and run thru a Sonoma Guitarjack stage. I was ready to take the next step and go for the BIAS AMP rack. The first thing I found out that only a few user models on the tone cloud were available to download to the IPAD, you need to run BIAS amp on your desktop/Mac to download and save to the head. I had to exchange the first unit (it was an open box) parts were ratting around inside and a high pitched noise on all patches. The great folks at Sweetwater rushed me out a new unit. The new unit has locked up twice while changing presets/models from Ipad pro once while demoing guitars and once live. I must say that some of the models such as the 50w Plexi are great!! However equipment malfunctions in a live setting or professional setting are not a good thing. Not keeping this unit.
Music background: Luthier and Musician
See also: Amp Heads, Positive Grid, Positive Grid Guitar Amp Heads