The Carl Martin Ottawa is a Carl Martin wah pedal, currently around $145.09. Close alternatives include the Electro-Harmonix Q-Tron Plus and the Emma DiscomBOBulator. It pairs well with the Revv Generator 100R MkIII 3-Channel Head and the Bad Cat Cub.
Carl Martin Ottawa
Carl Martin · pedal
The Carl Martin Ottawa is an analog optical envelope filter pedal delivering classic auto-wah and filter sweep effects without a treadle. Features three selectable filter modes: High Pass (HP), Band Pass (BP), and Low Pass (LP) for different frequency response characters. Q control shapes resonance and filter sweep width. Attack and Tone controls adjust filter response timing and high-frequency content. Current draw approximately 14mA. Danish boutique analog construction. Suited for funk, soul, and R&B guitar and bass players seeking touch-sensitive auto-wah tones.
What stands out
“Its standout strength is the three filter modes combined with independent Q, Attack, and Tone controls for precise filter character shaping”
— from the community notes
“Limitations: Optical circuit sensitivity may require calibration adjustment when player dynamics or instrument output changes”
— from the reviews
“the carl martin ottawa is an analog optical envelope filter pedal delivering classic auto-wah and filter sweep effects”
— from the listing
“The Ottawa delivers classic optical envelope filter tones with three mode options that give meaningfully different frequency characters, from synth-filter Band Pass to wah-like Low Pass to bright High Pass, covering a wide range of auto-wah…”
— from the community notes
“Strengths: Three filter modes (HP/BP/LP) provide meaningfully different envelope filter characters from classic wah to synth-style resonance”
— from the reviews
- filter
- optical
- envelope filter
- high pass
- frequency
- sensitivity
- resonance
- synth
Price updated Oct 24, 2026
Genres the Carl Martin Ottawa is commonly used in
- Soul
- Funk
- Experimental
cited
Inferred from shared tonal signals, not a stated genre tag. - Electronic
cited
Inferred from shared tonal signals, not a stated genre tag. - Bedroom Pop
cited
Inferred from shared tonal signals, not a stated genre tag. - Reggae
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Carl Martin Ottawa
Revv Generator 100R MkIII 3-Channel Head
Revv
21% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → smooth)
What Revv Generator 100R MkIII 3-Channel Head brings here leans toward smooth — that's worth building a pairing around
Comes later in the signal chain
Bad Cat Cub
Bad Cat
21% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
Bad Cat Cub leans toward harmonically rich, and that's a real, usable character to pair with
Comes later in the signal chain
Ampeg Rocket Watts
Ampeg
tonal matchComes later in the signal chain
Ampeg Rocket Watts goes after Carl Martin Ottawa in the chain
Orange Little Bass Thing
Orange
tonal matchComes later in the signal chain
Put Orange Little Bass Thing after Carl Martin Ottawa
Ceriatone British Style 2525
Ceriatone
tonal matchComes later in the signal chain
Ceriatone British Style 2525 goes after Carl Martin Ottawa in the chain
Port City Pearl Head
Port City
tonal matchComes later in the signal chain
Put Port City Pearl Head after Carl Martin Ottawa
Vox AC30S1 OneTwelve 30W 1x12 Combo
Vox
tonal matchComes later in the signal chain
Vox AC30S1 OneTwelve 30W 1x12 Combo goes after Carl Martin Ottawa in the chain
Marshall Studio Jubilee 2525H 20W Head
Marshall
tonal matchComes later in the signal chain
Marshall Studio Jubilee 2525H 20W Head goes after Carl Martin Ottawa in the chain
Pedals that stack with the Carl Martin Ottawa
Dunlop MXR Distortion Plus
Dunlop
22% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
What Dunlop MXR Distortion Plus brings here leans toward warm — that's worth building a pairing around
Comes later in the signal chain
J. Rockett Archer Ikon
J Rockett
21% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
J. Rockett Archer Ikon's own compressed character is the real reason this is worth trying
Comes later in the signal chain
Echoplex EP-3
Echoplex
11% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Echoplex EP-3's analog warmth voice goes after Carl Martin Ottawa in the signal chain — it's not there to compete with Carl Martin Ottawa's own analog warmth character — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Caroline Guitar Company Kilobyte
Caroline Guitar Company
10% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Caroline Guitar Company Kilobyte's pristine voice goes after Carl Martin Ottawa in the signal chain — it's not there to compete with Carl Martin Ottawa's own analog warmth character — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Pigtronix Philosopher's Rock
Pigtronix
tonal matchComes later in the signal chain
Put Pigtronix Philosopher's Rock after Carl Martin Ottawa
Dunlop MXR Randy Rhoads Concorde Distortion, model RR104C
Dunlop
tonal matchComes later in the signal chain
Put Dunlop MXR Randy Rhoads Concorde Distortion, model RR104C after Carl Martin Ottawa
Crazy Tube Circuits Venus
Crazy Tube Circuits
tonal matchComes later in the signal chain
Crazy Tube Circuits Venus goes after Carl Martin Ottawa in the chain
DigiTech DOD Compressor 280
Digitech
tonal matchComes later in the signal chain
Put DigiTech DOD Compressor 280 after Carl Martin Ottawa
Cheaper alternatives
Electro-Harmonix Micro Q-Tron Envelope Filter
Electro-Harmonix
73% similarityShared character: soul, mono synth, sensitivity
Electro-Harmonix XO Micro Q-Tron
Electro-Harmonix
61% similarityShared character: sensitivity, tight tracking, natural resonance
Behringer B-Tron III Envelope Filter
Behringer
59% similarityShared character: sensitivity, tight tracking, wah
Electro-Harmonix Nano Q-Tron
Electro-Harmonix
58% similarityShared character: mono synth, sensitivity, tight tracking
Behringer Meatball Restyled
Behringer
53% similarityShared character: sensitivity, tight tracking, wah
Demon FX Pearl White Auto Wah
Demon Fx
49% similarityShared character: sensitivity, tight tracking, wah
Boutique & premium upgrades
Maxon AF-9 Auto Filter
Maxon
69% similarityShared character: soul, sensitivity, natural resonance
Fairfield Circuitry Long Life
Fairfield Circuitry
52% similarityShared character: natural resonance, filter, response
Ashdown Type 23 Three Band Filter
Ashdown
51% similarityShared character: soul, sensitivity, filter
Keeley Nova Wah
Keeley
48% similarityShared character: sensitivity, wah, filter
Similar charactersee all similar tone character →
Electro-Harmonix Q-Tron Plus
Electro-Harmonix
64% similarityShared character: mono synth, wah, natural resonance
Emma DiscomBOBulator
pedal
62% similarityShared character: soul, mono synth, sensitivity
Subdecay Proteus MKII Sample
Subdecay
58% similarityShared character: mono synth, natural resonance, filter
Guyatone Wah Rocker WR3
pedal
53% similarityShared character: mono synth, sensitivity, wah
Electro-Harmonix Riddle Q Balls
Electro-Harmonix
51% similarityShared character: soul, sensitivity, natural resonance
Dr. Scientist Dusk
Dr Scientist
51% similarityShared character: natural resonance, filter
See all alternatives to the Carl Martin Ottawa (cheaper + boutique) →
Questions people ask
What are good alternatives to the Carl Martin Ottawa?+
The closest matches in character are the Electro-Harmonix Q-Tron Plus, the Emma DiscomBOBulator, the Subdecay Proteus MKII Sample. Budget picks: Electro-Harmonix Micro Q-Tron Envelope Filter, Electro-Harmonix XO Micro Q-Tron, Behringer B-Tron III Envelope Filter. Boutique upgrades: Maxon AF-9 Auto Filter, Fairfield Circuitry Long Life, Ashdown Type 23 Three Band Filter.
What pairs well with the Carl Martin Ottawa?+
Strong matches from rig and tone-complementarity evidence: Revv Generator 100R MkIII 3-Channel Head, Bad Cat Cub, Ampeg Rocket Watts — What Revv Generator 100R MkIII 3-Channel Head brings here leans toward smooth — that's worth building a pairing around.
How much does the Carl Martin Ottawa cost?+
Around $145.09 (live listing price, updated Oct 24, 2026).
Compare
- vs Carl Martin Ottawa Vintage Optical Envelope Auto-Wah/Envelope Filter
- vs Maestro Agena
- vs Smokin' Amp Co. Micro V Envelope Filter