The Ashdown MAS GZR-Pod is an Ashdown distortion pedal, currently around $250.61. Close alternatives include the Ashdown Geezer Butler Signature and the Ashdown James LoMenzo Mega Drive. It pairs well with the Laney DBC410 Digbeth 4x10 Cabinet and the Fuchs FBT-700.
Ashdown MAS GZR-Pod
Ashdown · pedal
The Ashdown MAS GZR-POD is a variant of the Geezer Butler Pedal of Doom, a professional-grade bass preamp and distortion pedal built with Black Sabbath bassist Geezer Butler. It features dual independently switchable EQ stages, an active 5-band EQ on each channel, transformer-isolated DI output, dual VU meters, and 9V or 18V operation for adjustable headroom. The Clean channel delivers warm vintage tube-amp character at low gain while the Doom channel pushes into aggressive saturation and fuzz territory. Suited for doom metal, stoner rock, and classic heavy rock bass tones with strong DI capabilities for direct recording or live PA routing.
What stands out
“Most valued as a bass preamp and DI unit with built-in drive”
— from the community notes
“Works best placed before or direct to PA via the transformer DI”
— from the community notes
“the ashdown mas gzr-pod is a variant of the geezer butler pedal of doom”
— from the listing
“At moderate gain the dual-channel architecture produces genuinely warm, vintage-flavored bass saturation with real tube-amp character and low-end depth”
— from the reviews
“The Clean channel delivers warm vintage tube-amp character at low gain while the Doom channel pushes into aggressive saturation and fuzz territory”
— from the listing
Trade-offs
“It features dual independently switchable EQ stages, an active 5-band EQ on each channel, transformer-isolated DI output, dual VU meters, and 9V or 18V operation for adjustable headroom”
— from the listing
- di
- doom
- transformer
- bass
- drive
- low gain
- headroom
Good for
- Silent Recording
- Silent Stage
Price updated Oct 23, 2026
Genres the Ashdown MAS GZR-Pod is commonly used in
- Doom Metal
- Stoner Rock
- Metal
cited
Inferred from shared tonal signals, not a stated genre tag. - Alternative
cited
Inferred from shared tonal signals, not a stated genre tag. - 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.
Amps that pair well with the Ashdown MAS GZR-Pod
Laney DBC410 Digbeth 4x10 Cabinet
Laney
20% matchpushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (high gain → tight)
Feed a high gain signal into Laney DBC410 Digbeth 4x10 Cabinet and it comes out closer to tight
Comes later in the signal chain
Fuchs FBT-700
Fuchs
19% matchpushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (high gain → tight)
Fuchs FBT-700 pushes a high gain tone toward tight
Comes later in the signal chain
Mesa Boogie Mark Five:25 Head
Mesa Boogie
tonal matchComes later in the signal chain
Mesa Boogie Mark Five:25 Head leans this low gain tone toward high gain, which it doesn't make on its own
Revv Generator 120 MkIII 10th Anniversary 4-Channel 120W Head
Revv
tonal matchComes later in the signal chain
Revv Generator 120 MkIII 10th Anniversary 4-Channel 120W Head leans this low gain tone toward high gain, which it doesn't make on its own
Gallien-Krueger Fusion 210
Gallien Krueger
tonal matchComes later in the signal chain
Stack Gallien-Krueger Fusion 210 on top and a high gain tone tightens toward mid-forward
Revv Generator 120 MkIII 4-Channel 120W Head
Revv
tonal matchComes later in the signal chain
Into a low gain tone, Revv Generator 120 MkIII 4-Channel 120W Head brings a pull toward high gain that's missing
Fender Dual Showman
amplifier
tonal matchComes later in the signal chain
Fender Dual Showman takes that high gain character and pushes it toward tight
Vox MV50 Rock with 1x8 Cabinet
Vox
tonal matchComes later in the signal chain
Vox MV50 Rock with 1x8 Cabinet leans this low gain tone toward high gain, which it doesn't make on its own
Pedals that stack with the Ashdown MAS GZR-Pod
Soldano SLO
Soldano
22% matchgain stackingStacks two gain stages for more saturation than either produces alone. (low gain → high gain)
Into a low gain tone, Soldano SLO brings a pull toward high gain that's missing
Comes later in the signal chain
MXR Micro Amp
MXR
21% matchpushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (high gain → clean boost)
MXR Micro Amp takes that high gain character and pushes it toward clean boost
Comes earlier in the signal chain
Strymon Zelzah -Dimensional Phaser
Strymon
18% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Keep Strymon Zelzah -Dimensional Phaser after Ashdown MAS GZR-Pod in the signal chain, clear of Ashdown MAS GZR-Pod's own gain stage
Comes later in the signal chain
Crazy Tube Circuits Golden Ratio
Crazy Tube Circuits
17% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain.
Crazy Tube Circuits Golden Ratio's own tight character is the real reason this is worth trying
Comes earlier in the signal chain
Suhr Discovery
Suhr
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.
Keep Suhr Discovery after Ashdown MAS GZR-Pod in the signal chain, clear of Ashdown MAS GZR-Pod's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
J. Rockett Clockwork Echo
J Rockett
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 → modulated)
Keep Ashdown MAS GZR-Pod's low gain voice out front: J. Rockett Clockwork Echo goes after Ashdown MAS GZR-Pod in the signal chain so its modulated voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
NuX Drive Core Deluxe
Nux
tonal matchComes earlier in the signal chain
NuX Drive Core Deluxe leans this low gain tone toward high gain, which it doesn't make on its own
Matthews Effects The Pocket Drive Overdrive Boost
Matthews Effects
tonal matchComes earlier in the signal chain
Stack Matthews Effects The Pocket Drive Overdrive Boost on top and a high gain tone tightens toward clean boost
Cheaper alternatives
Electro-Harmonix Nano Operation Overlord
Electro-Harmonix
49% similarityShared character: hard rock, treble, bass
Laney Digbeth DB-Pre
Laney
47% similarityShared character: presence, recording, bass
Dunlop MXR M85 Bass Distortion
Dunlop
46% similarityShared character: high gain settings, presence, bass
Electro-Harmonix Battalion Bass Preamp/DI
Electro-Harmonix
45% similarityShared character: treble, bass, distortion
Palmer Pocket AMP Bass
Palmer
45% similarityShared character: bass
Sadowsky SBP-2 Bass Preamp
Sadowsky
45% similarityShared character: presence, treble, bass
Boutique & premium upgrades
Similar character
Ashdown Geezer Butler Signature
Ashdown
82% similarity“is a variant of the Geezer Butler Pedal of Doom, a professional-grade bass preamp and distortion pedal built with Black Sabbath bassist Geezer Butler.”
Ashdown James LoMenzo Mega Drive
Ashdown
49% similarityShared character: hard rock, bass, response
Tech 21 Sansamp YYZ Shape-Shifter
Tech 21
46% similarityShared character: bass, distortion, aggressive playing
Hotone B Station
Hotone
45% similarityShared character: recording, treble, bass
Palmer Pepampbass
Palmer
43% similarityShared character: recording, bass, studio
Tech 21 GED-2112 Bass
Tech 21
43% similarityShared character: recording, bass
See all alternatives to the Ashdown MAS GZR-Pod (cheaper + boutique) →
Questions people ask
What are good alternatives to the Ashdown MAS GZR-Pod?+
The closest matches in character are the Ashdown Geezer Butler Signature, the Ashdown James LoMenzo Mega Drive, the Tech 21 Sansamp YYZ Shape-Shifter. Budget picks: Electro-Harmonix Nano Operation Overlord, Laney Digbeth DB-Pre, Dunlop MXR M85 Bass Distortion. Boutique upgrades: Orange Bass Butler Bi-Amp Bass Preamp.
What pairs well with the Ashdown MAS GZR-Pod?+
Strong matches from rig and tone-complementarity evidence: Laney DBC410 Digbeth 4x10 Cabinet, Fuchs FBT-700, Mesa Boogie Mark Five:25 Head — Feed a high gain signal into Laney DBC410 Digbeth 4x10 Cabinet and it comes out closer to tight.
How much does the Ashdown MAS GZR-Pod cost?+
Around $250.61 (live listing price, updated Oct 23, 2026).