The Positive Grid Reactor 100 is a Positive Grid amplifier, currently around $449. Close alternatives include the Fender Mustang LT40S and the Positive Grid Spark Edge 4-Channel 65W Modeling Combo. It pairs well with the Electro-Harmonix LPB-1 and the JAM Pedals Red Muck.
Positive Grid Reactor 100
Positive Grid · amplifier
Positive Grid built its reputation primarily on digital modeling technology, most visibly through the Spark line of smart practice amps that use software-driven amp and effects modeling rather than traditional analog tube or solid-state circuitry, and the Reactor 100 sits within that broader digital amplification approach. The 100 designation suggests a higher-output model within the lineup, aimed at players who want Positive Grid's modeling and connectivity features at a volume level suitable for small gigs or rehearsal rather than bedroom practice alone. Specific amp modeling library size, control layout, and connectivity features for this exact model aren't confirmed from available sources.
What stands out
“most visibly through the spark line of smart practice amps that use software-driven amp and effects modeling”
— from the listing
“positive grid built its reputation primarily on digital modeling technology”
— from the listing
“The 100 designation suggests a higher-output model within the lineup, aimed at players who want Positive Grid's modeling and connectivity features at a volume level suitable for small gigs or rehearsal”
— from the listing
“The tradeoff inherent to digital modeling amps broadly is that some traditionalist players still prefer the feel and response of dedicated analog tube circuitry over software-modeled equivalents, even as modeling technology has closed much …”
— from the reviews
“Positive Grid has established itself as a leading name in digital amp modeling, and products in this category generally appeal to players who value versatility and app-based control over the more purist, single-voicing approach of a traditi…”
— from the reviews
Trade-offs
“spans small to mid-sized gigs and rehearsal spaces where more volume than a bedroom practice amp is needed”
— from the community notes
- practice
- digital
- rehearsal
- bedroom
- digital modeling amps
- digital amp modeling
- smart practice amps
- control layout
Good for
- Live
- Silent Stage
- Studio
Price updated Oct 22, 2026
Pedals that stack with the Positive Grid Reactor 100
Electro-Harmonix LPB-1
Electro-Harmonix
10% matchElectro-Harmonix LPB-1's own transparent character is the real reason this is worth trying
Goes in front of the amp
JAM Pedals Red Muck
Jam Pedals
10% matchJAM Pedals Red Muck leans toward scooped, and that's a real, usable character to pair with
Goes in front of the amp
JHS Pedals JHS AT+
JHS Pedals
10% matchJHS Pedals JHS AT+'s own dynamic character is the real reason this is worth trying
Goes in front of the amp
Electro-Harmonix Electric Mistress
Electro-Harmonix
7% matchKeep Positive Grid Reactor 100's pristine voice out front: Electro-Harmonix Electric Mistress goes after Positive Grid Reactor 100 in the signal chain so its lush voice doesn't muddy it
Goes in front of the amp
Boss DD-7 Digital Delay
Boss
5% matchKeep Positive Grid Reactor 100's pristine voice out front: Boss DD-7 Digital Delay goes in Positive Grid Reactor 100's effects loop so its pristine voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Sits in the amp's effects loop
Boss DM-2 Delay
Boss
5% matchKeep Boss DM-2 Delay in Positive Grid Reactor 100's effects loop, clear of Positive Grid Reactor 100's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Sits in the amp's effects loop
Pigtronix Philosophers Tone Optical Compressor
Pigtronix
5% matchPositive Grid Reactor 100's own pristine character is the real reason this is worth trying
Goes in front of the amp
Cheaper alternatives
Vox Mini Go-10
Vox
58% similarityShared character: room, practice
Fender Mustang LXT50 Combo Amp
Fender
57% similarityShared character: practice, middle
Vox NEW! VOX VX50-DTV 50 Watt Modeling
Vox
55% similarityShared character: tonal possibilities, small gigs, wide range
Kustom 2.0 100 Watt 1X12"
Kustom
50% similarityShared character: small gigs, practice
Positive Grid Spark 2
Positive Grid
49% similarityShared character: practice
Positive Grid Spark 40W Modeling Practice Amp
Positive Grid
45% similarityShared character: practice, digital
Boutique & premium upgrades
Similar character
See all alternatives to the Positive Grid Reactor 100 (cheaper + boutique) →
Questions people ask
What are good alternatives to the Positive Grid Reactor 100?+
The closest matches in character are the Fender Mustang LT40S, the Positive Grid Spark Edge 4-Channel 65W Modeling Combo, the Fender Mustang GTX 100. Budget picks: Vox Mini Go-10, Fender Mustang LXT50 Combo Amp, Vox NEW! VOX VX50-DTV 50 Watt Modeling. Boutique upgrades: Traynor AM Studio.
What pairs well with the Positive Grid Reactor 100?+
Strong matches from rig and tone-complementarity evidence: Electro-Harmonix LPB-1, JAM Pedals Red Muck, JHS Pedals JHS AT+ — Electro-Harmonix LPB-1's own transparent character is the real reason this is worth trying.
How much does the Positive Grid Reactor 100 cost?+
Around $449 (live listing price, updated Oct 22, 2026).