Positive Grid has officially shaken up the guitar amplification market with the launch of the Positive Grid Reactor series. Available in both 50W and 100W 1×12” combo configurations, these digital modeling amplifiers aim to bridge the gap between traditional tactile feel and cutting-edge artificial intelligence.
At the core of the Reactor series is Positive Grid’s proprietary Amp Intelligence sound engine. Moving far beyond the standard preset-scrolling found in traditional modeling amps, the Reactor allows players to generate entire signal chains using audio clips, photos of physical rigs, or text descriptions.
Traditional Build Meets Next-Gen Intelligence
Despite the advanced digital brain, Positive Grid has designed the Reactor to look and feel like a classic gigging amplifier. Both the 50W and 100W variants are housed in sturdy wooden cabinets equipped with custom-voiced 12” speakers.
Where the Reactor separates itself from the competition is under the hood. Positive Grid engineers have decoded more than 200 classic amplifiers down to the component level, replicating gain stages, transformers, and bias points.
A Triple-Threat Interface
Players can interface with the Reactor in three distinct ways:
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The Top Panel: Physical, tactile knobs control gain, EQ, effects, and master volume, supplemented by specialized “Mod switches.”
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The Reactor App: A drag-and-drop digital tone studio that handles visual signal chain editing and AI tone generation.
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The Reactor Control Footswitch: Sold separately, this six-button accessory supports expression pedals and can operate via a wired or wireless connection.
AI-Driven Tone Capture and Sound Shaping
The standout feature of the Reactor series is the Creator Hub’s Tone Capture, which utilizes the Amp Intelligence engine to build playable rigs through three distinct inputs:
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Audio to Tone: Users can upload an audio sample, and the engine recreates the exact guitar tone.
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Image to Tone: Taking a photo of a pedalboard or an amplifier translates that visual data into a digital signal chain.
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Text to Tone: Players can type descriptions, artist names, or sonic vibes to instantly generate a custom patch.
Furthermore, a Tone Memory feature analyzes the user’s playing habits and EQ tweaks over time, subtly adjusting the engine to match the player’s stylistic preferences.
Advanced I/O and Onboard Controls
Out of the box, the Reactor includes 24 amplifier models and 27 onboard effects, allowing users to run up to 8 effects simultaneously. Unique global tone-shaping controls include Heat (harmonic tightening), Push/Smooth (presence and top-end warmth adjustment), and selectable wattage to maintain consistent gain structures at bedroom volumes.
For studio and stage routing, the Reactor features a USB-C audio interface output (24-bit/48kHz), a cabinet-emulated line out, an effects loop, MIDI input, a headphone output, and a dedicated power amp input for external modelers. Wi-Fi and Bluetooth are built-in for over-the-air firmware updates and app connectivity.
Frequently Asked Questions (FAQ)
What is the difference between the two Reactor models?
The Reactor comes in a 50-watt or a 100-watt version. Both are 1×12″ combos featuring the same digital engine, but the 100W model offers more clean headroom and volume for larger stage environments.
Can I use the Reactor amp without a smartphone or tablet?
Yes. The physical top panel features traditional knobs for gain, EQ, effects, and master volume, alongside 8 recallable onboard presets. However, deep editing and the AI Tone Capture features require the companion Reactor app.
Is the Reactor Control footswitch included with the amplifier?
No, the 6-button Reactor Control footswitch is sold separately. It can be used in either a wired or wireless configuration to toggle presets and effects during live performances.
MSRP – 50W $349/£299, 100W $449/£379, Footswitch $149/£129
Verdict & Score
The Verdict: The Positive Grid Reactor series represents a massive evolutionary step for digital modeling.
By replacing rigid factory presets with an adaptive, AI-assisted sound engine, it offers unprecedented flexibility without sacrificing the physical, air-moving satisfaction of a real 1×12″ wooden cabinet.
It is a highly capable tool for modern guitarists who span the home studio and the live stage.
Final Score: 8.2 / 10
Where To Buy
Available direct from Positive Grid
Dealers Worldwide
Available at Thomann, 50W, 100W, & Footswitch
#Positive Grid #Reactor
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