Dunlop MC404-U
Dunlop MC404-U
Dunlop MC404-U
Dunlop MC404-U
Dunlop MC404-U
Dunlop MC404-U
Dunlop MC404-U Cry Baby CAE Wah Pedal
Product images are provided for reference and may not represent the exact model, configuration, or included components.

At A Glance

Input Impedance
1 MΩ
Output Impedance
Center Freq. (Yellow Inductor) - Heel Down
400 Hz
Center Freq. (Yellow Inductor) - Toe Down
1.9 kHz to 2.2 kHz
Center Freq. (Red Inductor) - Heel Down
255 Hz to 355 Hz
Center Freq. (Red Inductor) - Toe Down
1.3 kHz to 1.5 kHz
Maximum Level - Input
-6 dBV
Maximum Level - Output
+8 dBV
Maximum Gain - Heel Down
+16 dB
Maximum Gain - Toe Down
+16 dB
Noise Floor - Heel Down
-85.5 dBV
Noise Floor - Toe Down
-82.0 dBV
Bypass
True Bypass
Current Draw
Description

Dunlop produced the MC404-U Cry Baby CAE Wah as a feature-expanded wah pedal within the Cry Baby line, positioning it above standard single-voicing wah units by incorporating a dual-inductor switching arrangement developed in collaboration with CAE (Custom Audio Electronics).

The pedal housed two Fasel® inductors — a yellow and a red — selectable via an onboard switch, each delivering a distinct frequency sweep character. The yellow inductor swept from 400 Hz at heel down to between 1.9 kHz and 2.2 kHz at toe down; the red inductor covered a lower and narrower range, from 255 Hz–355 Hz at heel down to 1.3 kHz–1.5 kHz at toe down. Input impedance was rated at 1 MΩ and output impedance at under 10 kΩ. A built-in Boost/Line Driver circuit was included alongside internal Q and gain controls, with maximum gain of +16 dB available in both heel-down and toe-down positions. The maximum input level was −6 dBV and the maximum output level +8 dBV. Current draw ran under 6.3 mA. The unit employed true bypass switching, and status LEDs on each side of the pedal indicated active inductor selection. Noise floor measured −85.5 dBV at heel down and −82.0 dBV at toe down.

Owners setting up or servicing this unit, particularly when adjusting the internal Q and gain trimmers or tracing signal-path issues, should consult a qualified guitar technician familiar with active wah circuitry.

Expert Analysis
Q&A
Additional info
Icon Loading
Product Video
Have Questions?
The owner archive

From the people who own them

Nothing in The Vault is for sale. These records exist so the instruments stay documented after the manufacturer moves on — and the most useful part of that record is what owners add to it.

Owner photos

Owner photos

Put yours on the record.

The catalog shot showed one finish, under one light, a long time ago. Yours has been played. Photos from owners are what the next person finds when they are trying to identify a part, match a finish, or work out whether the one they just bought is really what the seller said it was.

Comments

What do you know about this one?

Specs only go so far. What actually fits, what breaks first, what the factory got right and what everyone ends up changing — that lives with the people who own them, not in a datasheet. Post what you know and it stays on this page for whoever comes looking next.

RELATED PRODUCTS

Looking for more Dunlop products? Shop the full Dunlop catalog →

Gear Help, Handled

From spec questions to full builds — players who have lived this gear since 2007.

Since 2007

Fit & Compatibility

  • Bridge, tuner, and nut fit confirmed for your guitar
  • Pickup and electronics compatibility checks
  • Pedal power and amp/cab impedance matching
Ask Before You Buy

Mods & Upgrades

  • Upgrade paths for the guitars you already own
  • Wiring, routing, and hardware swap guidance
  • Advice from people who actually do the mods
Talk Mods

The Vault

  • Discontinued and EOL guitars kept on record
  • Specs, history, and known part compatibility
  • Share your builds and mods with the community
Enter The Vault
!