Positive Grid Reactor - Is an AI Amp Actually Good?

Just when you thought amps and tone-modeling was high tech enough, Positive Grid comes out with an AI-integrated amp line. I can say this is definitely not like anything I’ve seen that’s out there as of yet. With many companies embracing new technology like AI, Positive Grid decided to take a step further from their practice amps and create something a whole lot cooler.

I got a chance to go down into the AMS studio to play through a Reactor amp, and I’m going to talk through some of the highlights that stood out and what sets it apart from other amps out there. This amp has that classic amp body with the high tech brains of the modern world.

Reactor is Positive Grid’s newest amp line, built around AI‑driven tone shaping to give players a wide palette of sounds in whatever direction their music takes them. The series comes in two models, a 50‑watt version and a 100‑watt version — both equipped with custom 12‑inch speakers that forms the core of the amp’s character. You can also choose your output level directly from the dashboard, switching between 1W, 25W, or full power with a simple turn of the wattage knob.

The top‑panel dashboard lays out everything clearly. You can move through six channels; Clean, Warm, Grit, Crunch, Hi‑Gain, and Extreme and then shape your sound further with the Amp selector, Push/Smooth, Heat, Gain, EQ, effects, and volume controls. The Push/Smooth switch shifts the amp from relaxed rhythm tones to sharper, cutting leads without altering your distortion settings, while Heat adjusts harmonic response and feel without noticeably changing volume.

All controls are clearly labeled and easy to reach, making the amp intuitive whether you’re dialing in tones at home or on stage. For even more flexibility, Positive Grid offers a separate footswitch, which gives you quick access to these functions mid‑performance, something I strongly recommend if you plan to gig with this amp.

One of the standout features of the Reactor amps is how seamlessly they integrate with the Reactor app. You can upload a track, record a sound, or even send an image or text prompt, and the AI will build a guitar tone to match it. The app remembers your prompts, inputs, and settings, so you can instantly recall tones whenever you feel the inspiration strike.

Reactor’s AI has analyzed more than 200 amp designs, breaking them down to the circuit level with gain stages, transformers, harmonic behavior, to capture the unique and nuanced feel of each one. You can drag and drop effects anywhere in the signal chain and even insert external pedals through the FX loop at any point. They start you off with 24 amps and 27 effects, with support for up to eight simultaneous effects, and you can expand from there as you build out your library.

If you prefer text or voice prompts, just describe the sound you’re after, “tight, mid‑gain British crunch” or “glassy ambient cleans,” and let the app build it for you. Drop in a sound sample, snap a photo, or use the Tone Assistant to refine your tone with simple instructions like “more warmth,” “less gain,” or “add some space.” You can also design your own amps and share presets with the community on Tone Cloud, where you might discover new sounds you love and want to save.

This whole system shines because it lets you recreate gear you already know while also exploring sounds from amps that don’t even exist (yet).

If I had to describe the overall character of the Reactor, I’d call it “pure” or “slightly sterile,” but not in an obvious way — just cleaner and more precise than some other amps out there. Personally, I’ve always been a little skeptical of gear that feels too perfect; I like a bit of warmth and authenticity, especially coming from my amp. But that’s my only real critique here. And even then, Reactor is far less sterile than many other digital modeling amps I’ve tried in the past. I’d put it a small footstep ahead of like a Boss Katana.

And yes, I absolutely tested it with a picture of Eddie Van Halen I got online… and the tone was shockingly close to a 5150-era sound. Even pedal and amp purists like me might feel a little annoyed at how effortlessly this thing dials in great sounds. Test it for yourself, take a picture of your plant or your lunch and see what happens. Why not be insane and push technology to its limits?

Positive Grid has already proven itself in the practice‑amp world with their previous amp releases and now they’ve taken a bold leap by integrating AI directly into an amplifier. And sure, AI is one of the most debated topics out there right now, so seeing it baked into an amp can feel a little… ugh. But if it sounds good, then you won’t hear any complaining from me.

My biggest question going in was: “Can I actually gig with this thing and trust it to get me through the night?” After testing it out, it was clear that you absolutely can. With both 50‑watt and 100‑watt versions available, there’s more than enough power for typical live situations. For larger venues, I’d still recommend mic’ing the amp to preserve your tone and give yourself better volume control, but the Reactor has more muscle than you might expect, and it’s portable enough to take anywhere. Portability is a gamechanger, maybe it’s just PTSD me of lugging a Fender Twin to tiny NYC clubs.

If you’re heading out on a world tour with a massive production or regularly playing huge stages, you might run into volume limitations with a 100‑watt digital amp — but that’s only if you’re not running through a PA. In most real‑world scenarios, the PA is doing the heavy lifting anyway. And the amp has a line out, so you can connect directly to the PA with cab sim, if that’s more your speed.

The 50‑watt model is the one you’ll almost always mic unless you’re sticking to small or mid‑sized venues. Since the Reactor is fully digital and doesn’t have tubes, pushing it too hard can change the character of your tone in ways you might not love. Tube breakup and digital breakup behave very differently, so mic’ing the amp helps you keep your sound intact and avoids that “microwaved guitar tone” effect.

Studio session? No problem. The Reactor fits right in. A studio is the perfect environment to experiment with various tones, and this amp gives you plenty to explore. It’s something you can confidently bring to the places that actually matter.

By now you’ve probably put two and two together, this amp is pretty much for anyone. From beginners to advanced players, bedroom player, gigging musicians, recording artists, the Reactor covers everyone’s needs.

This amp has a lot of flexibility with various cleans and gains, not to mention you have the Tone Manager app that gives you access with a library of sound patches to choose from. So, if you find yourself switching between different genres and styles, you can rest assured in the fact that you have a piece of gear that can support you.

And for the cost? You get a lot of value. An amp with AI integration is in its own class so there’s not much competition unless you want to get into amp modeling heads and pedals. But those I would categorize differently because the Reactor brings to you an actual amp, not something that needs relies on an external speaker or PA to get sound out.

For a modeling combo amp with AI integration, it’s a great amp for all. If you’re someone who wants to branch out and experiment, it’s worth playing through and testing out to see how you like it. Plus, it’s not going to take a huge chunk of change and for what you’re getting out of it, I’d say it’s a sound choice. With 24 amps and 27 effects to get rolling, you can have a lot of fun venturing into different musical territories with this one.