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Sweetwater is an Authorized Positive Grid Dealer

  • Genuine New Item
  • Sweetwater's 2-year warranty

Fast, FREE Shipping!

  • Nearly every order received by 3PM Eastern ships the SAME DAY!
  • FREE shipping to lower 48 states.
  • Our central location reaches most states in 1-4 business days
  • 99.95% warehouse accuracy
  • Expedited shipping available
We are proud to provide some of the fastest turnaround times on eBay. We use FedEx or UPS for most items, and USPS for smaller items. Residents of Hawaii, Alaska, and Puerto Rico should contact us for a shipping quote. Orders shipping to Indiana will be charged 7% sales tax.

In order to ensure you receive your valuable shipment, all orders over $500 will require a delivery signature.

Buy with confidence!

Sweetwater's been selling on eBay since 2001, with 99.9% positive feedback!
  • More than 30 years in business
  • World-class customer service
  • Fast, FREE shipping
  • Free 2-year warranty on nearly every product
  • Free tech support from audio experts

Positive Grid BIAS Head Amp Match Preamplifier

Guitar Preamplifier with Amp Match Technology and Integration with BIAS Amp Pro Software and BIAS Amp App

Unlimited Amp Modeling Potential

The Positive Grid BIAS Head 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 Head 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 Head 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 Head 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 Head Processor. At home or in your studio, just connect the BIAS Head 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 Head 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 Head 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 Head Processor Features:

  • 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
Specification Detail
Type Solid State hardware/software instrument preamp
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 7.5"
Width 12"
Depth 6"

RETURN INFORMATION
We want you to be completely happy with your purchase from Sweetwater. If you are not satisfied with your product, you may return it for a refund of the purchase price within 30 days. If your purchase was eligible for Free Shipping, the shipping cost will be deducted from your credit or refund. Returns must be in the complete and original packaging with all accessories and complete documentation (Owner's Manual, warranty card, quick start guides, etc.), show no signs of wear or use, and include a Return Authorization number or be subject to a restocking fee. Some products are not returnable, including:

  • Special orders
  • Software
  • Oversized or overweight items
  • Discontinued products, closeouts, and used products
  • Cymbals
  • Tubes
  • Speakers
  • Drumsticks
  • Guitar strings
  • Personal items (earphones, harmonicas, mouthpieces, etc.)

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