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BIAS Head 600 Watt 25-Preset Amplifier Head


BIAS Head sounds and feels like your favorite classic and boutique tube amplifiers, but offers entirely new flexibility. The advanced component emulation engine captures the warmth, girth and feel of real tube amps, authentically recreating the complex circuit behaviors that make them do what they do. From djent to jazz and everything in between, BIAS Head is deeply rooted in the rich history of tube amplifier design while remaining aimed directly at the future


Harnessing the power of BIAS Head is easy - just select one of the 25 onboard presets, grab a knob and start tweaking. Need more grit on your clean tone? Add another tube stage to the preamp. Want the power amp to feel more aggressive? Change the circuit topology and push the virtual power tubes harder. Prefer a crisper treble response? Flip the power amp presence switch to Modern and hear the top end open up. All of this tweaking is possible directly from the front panel knobs, so it’s completely intuitive - no laptop or mobile device required.


All BIAS products can connect to the Positive Grid ToneCloud, a cloud-based community Positice Grid has created specifically for guitarists and musicians. It’s much more than just an online storage tank for sounds - it’s a place to discover new ideas and new tones. You can download new amps created by artists and recording studios, backup and share your own creations with other guitarists in the community, and interact with other musicians with similar interests.

BIAS AMP software features the ability to Amp Match®, analyzing a source guitar tone and applying the necessary corrective processing to make a custom amp more closely match the original. Even if you don’t plan on matching amps yourself, you can still take advantage of the Tone Match feature by downloading custom amps other guitarists have matched from the ToneCloud.


Deciding which amp to take to a gig can be problematic - tube amps can be heavy, and they’re designed to operate within a specific volume range. Many guitarists find that they need multiple amps to cover all of the sizes of gigs they play, which is expensive.

That isn’t a problem with BIAS Head, because it sounds and feels authentic no matter where the master volume is set. The built-in 600-watt power amp can handle any gig you throw at it, and at less than 12 pounds you won’t have to take separate trips when loading your gear onstage. Add to that super fast patch-switching and a glitchless effects loop, and you have the ultimate gigging amp for every situation.


BIAS Head is the most flexible pedal platform in the business. No matter how you connect your pedalboard, you can swap BIAS Head for your old amp in less than a minute.

Not only that, BIAS Head’s sonic flexibility means that your pedalboard can be more flexible too. Gone are the days of building a board with pedals that only work with the one amp you’re currently gigging with - now you can put together a much wider tonal palette.


Professional guitar amplifier heads rarely include reverb, even though it’s a vital effect for guitarists. When they were designing BIAS Head, they wanted to squeeze every drop out of their DSP horsepower to provide not only the most authentic amp feel they could, but also to optimize the patch-switching speed for live playing - which meant not including a reverb initially.

However, at Positive Grid they are passionate about listening to customers. The top request worldwide has been to include reverb in BIAS Head and Rack, so after many sleepless nights and a few near-overdoses of caffeine, they are now pleased to offer nine different built-in reverbs in BIAS Head and Rack!

More than just a simple two-knob reverb, you have controls for reverb type, decay time and mix, as well control of Damping (which simulates absorptive material in the room, reducing high frequencies), Lo and Hi Cut, and Dwell (which operates like a saturation control). The most versatile amp on the planet just got more versatile!


• Guitar amplifier featuring component-level customization
• 25 onboard custom amplifier presets (with thousands more available on ToneCloud)
• Built-in 600-Watt Class D power amplifier (600 watts @ 8 ohms, 300 watts @ 16 ohms)
• Glitchless Mono Effects Loop (loop does not mute at patch recall)
• Built-in Bluetooth Wireless for mobile control
• MIDI In, Out and Thru
• USB for connecting to Desktop Mac or PC
• Full BIAS AMP Pro software license ($199 value)
• Tonecloud Integration - backup, download and share presets on the cloud
• Pedal inputs (2)
• Load custom IR’s for direct operation
• Supports Amp Match® presets for direct operation
• Weighs only 11.6 pounds

Product Specs

Brand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.learn more
Brand Positive Grid
Model BIAS 600-watt Amp Match Amplifer Head w/Cover
Categories Guitar Heads

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Available for local pickup from Waterford, MI, United States

Ships from Waterford, MI, United States to:

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Return Window

This product can be returned within 14 days of receipt.

General Terms

Items must be returned in original, as-shipped condition with all original packaging and no signs of use. Buyer assumes responsibility for all return shipping costs unless the item was not received as described.


Buyer receives a full refund in their original payment method less any shipping costs.

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Refunds are made for product value only, excluding shipping and handling charges. If you received Free Shipping on your order, the value of the uncharged shipping cost will be deducted from your credit or refund.

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Motor City Guitar

Waterford, MI, United States
Joined: Apr 2014

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Positive Grid BIAS 600-watt Amp Match Amplifer Head w/Cover
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