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Positive Grid Spark 40

9/10 owned actively-used updated 2026-09-27

40 W smart practice amp with app-controlled amp models and effects, doubles as a Bluetooth speaker.

Maker	Positive Grid
Model	Spark 40
Type	Modeling guitar practice amp (40 W, 2x 4")

Store

Store	Price	Checked
Thomann.se	2 766 kr	2026-09-27

Specs

Spec	Value
Power	40 W, mains only (no battery)
Speakers	2x 4" stereo
Connections	Guitar in, headphone out, aux in, USB audio, Bluetooth
Weight	5.2 kg

Description

A desktop practice amp for electric, bass, and acoustic guitar. Tones and effects are picked and tweaked in the Spark app on the phone, and it also works as a Bluetooth speaker to play along with songs.

This was the first amplifier I bought after getting here, though it took me a good while to get around to it, because I wasn't giving music much focus. I've always tried to do things in the most technical way possible, so I was never very good at music, but I needed somewhere to play. I ended up finding this amp through a friend who recommended it.

The big thing about it is that it has a microcontroller inside that can basically do DSP, so it carries a billion different sounds, a billion pedals and pickups and other amplifiers, and it simulates almost any other amp on its list very well. It also has a store where people post their tones for free, which is very cool, so if I'm looking for a song I want to play and that song has a tone in there, I can play it sounding very close to the original. The app has a jam feature too, where an AI generates the tones and a backing track for you, based on a note you played, or a sequence of notes, or a rhythm you played for something like 10 or 30 seconds, and you just play over it.

Impressions

The advantage for me is that it's relatively small. I won't say it's small, because it isn't, it's fairly big for the power it has, 40 watts. I used it a lot.

It has two small problems. The first is that the power cable is relatively short, so you can't leave it very far from things. The second is that it's quite heavy, so you can't carry it everywhere, even though it isn't that big. It does come with a little bag to put it in, which is nice, and it comes with a series of other things too.

Another neat thing is that you can put music through it, so it works as a Bluetooth speaker, and then you can play over the music. At least that's what they say, but it isn't really true, because when you play over the track the music gets very quiet, so I never actually managed to play over what was already playing. The app itself is very good and has a lot in it.

It's an old version by now, and there are much newer ones, some of them relatively better. There's one called the Spark EDGE that runs on a battery, so it wouldn't need a cable, but it's quite a bit bigger and it's made for playing in other places too, which isn't my case. I'd probably be better off with the Spark GO, which is the other one I have, and that's mostly why I bought it. The problem with this Spark was having to plug it into the wall all the time, and not being able to play just anywhere.

Final thoughts