The Positive Grid Bias Rack Amplifier is a Positive Grid amplifier, currently around $1045.41. Close alternatives include the Morgan PR12 Head Driftwood and the Positive Grid Bias Mini Guitar 300W Head. It pairs well with the Suhr Shiba Drive and the Cusack Music Screamer.
Positive Grid Bias Rack Amplifier
Positive Grid · amplifier
The Positive Grid BIAS Rack Amplifier is the rack-format member of the BIAS modelling line, built on the same amp-matching platform that analyses a target amplifier and reproduces its response rather than relying on fixed presets alone. The rack chassis is aimed at players with existing rack systems or touring setups where a rack case is the practical format. Independent coverage of this specific model is limited compared with the BIAS Head and BIAS Mini, so this description stays with what the platform and format establish rather than asserting output or feature specifics.
What stands out
“The rack chassis is aimed at players with existing rack systems or touring setups where a rack case is the practical format”
— from the listing
“Independent coverage of , so this description stays with what the platform and format establish”
— from the listing
“A flexible, deeply editable modeling voice covering vintage cleans through modern high gain, with the BIAS software enabling component-level tweaking and amp-matching for highly personalized tones”
— from the reviews
“The main caveats are the narrower resale market rack gear generally has, and the shortage of model-specific documentation”
— from the community notes
“The Positive Grid BIAS Rack Amplifier is the rack-format member of the BIAS modelling line, built on the same amp-matching platform that analyses a target amplifier and reproduces its response”
— from the listing
- modern
- high gain
- vintage
- clean
- digital
- touring
- response
- rack systems
Good for
- Live
- Silent Stage
- Studio
Price updated Oct 24, 2026
Genres the Positive Grid Bias Rack Amplifier is commonly used in
- Metal
cited
Inferred from shared tonal signals, not a stated genre tag. - Punk Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Christian Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Hard Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Djent
cited
Inferred from shared tonal signals, not a stated genre tag. - Metalcore
cited
Inferred from shared tonal signals, not a stated genre tag.
Pedals that stack with the Positive Grid Bias Rack Amplifier
Suhr Shiba Drive
Suhr
17% matchpushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (high gain → mid-forward)
Suhr Shiba Drive takes that high gain character and pushes it toward mid-forward
Goes in front of the amp
Cusack Music Screamer
Cusack Music
16% matchpushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (high gain → mid-forward)
Stack Cusack Music Screamer on top and a high gain tone tightens toward mid-forward
Goes in front of the amp
J. Rockett The Dude
J Rockett
16% matchpushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (high gain → mid-forward)
Feed a high gain signal into J. Rockett The Dude and it comes out closer to mid-forward
Goes in front of the amp
Wylde Audio MXR Phase
Wylde Audio
16% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (high gain → lush)
Keep Wylde Audio MXR Phase after Positive Grid Bias Rack Amplifier in the signal chain, clear of Positive Grid Bias Rack Amplifier's own gain stage
Goes in front of the amp
TC Electronic Hall of Fame Reverb
TC Electronic
14% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (high gain → lush)
Put TC Electronic Hall of Fame Reverb in Positive Grid Bias Rack Amplifier's effects loop, clear of Positive Grid Bias Rack Amplifier's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Sits in the amp's effects loop
Meris Mercury7 Reverb
Meris
14% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (high gain → lush)
Keep Positive Grid Bias Rack Amplifier's high gain voice out front: Meris Mercury7 Reverb goes in Positive Grid Bias Rack Amplifier's effects loop so its ambient 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
Wampler Ego Compressor
pedal
10% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain.
Positive Grid Bias Rack Amplifier leans toward high gain, and that's a real, usable character to pair with
Goes in front of the amp
MXR CAE Wah
MXR
tonal matchGoes in front of the amp
Put MXR CAE Wah in front of Positive Grid Bias Rack Amplifier: a wah tracks picking dynamics best on the raw signal
Cheaper alternatives
Similar character
See all alternatives to the Positive Grid Bias Rack Amplifier (cheaper + boutique) →
Questions people ask
What are good alternatives to the Positive Grid Bias Rack Amplifier?+
The closest matches in character are the Morgan PR12 Head Driftwood, the Positive Grid Bias Mini Guitar 300W Head, the Blackstar ID:100 TVP Head 100Watt Modeling. Budget picks: Positive Grid Bias Mini Guitar 300W Head, Blackstar ID:100 TVP Head 100Watt Modeling.
What pairs well with the Positive Grid Bias Rack Amplifier?+
Strong matches from rig and tone-complementarity evidence: Suhr Shiba Drive, Cusack Music Screamer, J. Rockett The Dude — Suhr Shiba Drive takes that high gain character and pushes it toward mid-forward.
How much does the Positive Grid Bias Rack Amplifier cost?+
Around $1045.41 (live listing price, updated Oct 24, 2026).