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
    citedInferred from shared tonal signals, not a stated genre tag.
  • Electronic
    citedInferred from shared tonal signals, not a stated genre tag.
  • Bedroom Pop
    citedInferred from shared tonal signals, not a stated genre tag.
  • Reggae
    citedInferred 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% match
$2699via Reverb

fills 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% match

shapes 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 match

Comes later in the signal chain

Ampeg Rocket Watts goes after Carl Martin Ottawa in the chain

Orange Little Bass Thing

Orange

tonal match
$681.58via Reverb

Comes later in the signal chain

Put Orange Little Bass Thing after Carl Martin Ottawa

Ceriatone British Style 2525

Ceriatone

tonal match

Comes later in the signal chain

Ceriatone British Style 2525 goes after Carl Martin Ottawa in the chain

Port City Pearl Head

Port City

tonal match
$3625via Reverb

Comes later in the signal chain

Put Port City Pearl Head after Carl Martin Ottawa

Vox AC30S1 OneTwelve 30W 1x12 Combo

Vox

tonal match

Comes 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 match

Comes 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% match

shapes 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% match
$183.99via Reverb

shapes 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% match

sits 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% match
$199via Reverb

sits 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 match
$85.50via Reverb

Comes later in the signal chain

Put Pigtronix Philosopher's Rock after Carl Martin Ottawa

Dunlop MXR Randy Rhoads Concorde Distortion, model RR104C

Dunlop

tonal match
$129.97via Reverb

Comes 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 match

Comes later in the signal chain

Crazy Tube Circuits Venus goes after Carl Martin Ottawa in the chain

DigiTech DOD Compressor 280

Digitech

tonal match
$118.97via Reverb

Comes later in the signal chain

Put DigiTech DOD Compressor 280 after Carl Martin Ottawa

Cheaper alternatives

Boutique & premium upgrades

Similar charactersee all similar tone character →

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).

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