DOD FX25 Envelope Filter

DOD FX25 Envelope Filter

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FX25 Envelope Filter, Wah-Wah/Auto Wah/Filter for Guitar from DOD.

7 user reviews
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DOD FX25 Envelope Filter tech. sheet

  • Manufacturer: DOD
  • Model: FX25 Envelope Filter
  • Category: Wah-Wah/Auto Wahs/Filters for Guitar
  • Added in our database on: 01/11/2006

The FX25 Envelope Filter was derived from DOD's well-received 440 Envelope Filter. Like the 440, the FX25 uses a bandpass filter circuit where the peak frequency is determined by the input signal level, for a touch-controlled wah or auto-wah effect. The FX25 was one of the original ten DOD FX-series pedals that debuted in 1982, and remained in production until it was replaced by the FX25B in 1998.

  • Controls: Range, Sensitivity
  • List price (Jan. 1983): $69.95
  • Technical info:


  • Specifications (circa 1984): Input impedance = 500 k Ohms, Output impedance = 1 k Ohms; Filter frequency range = 50 Hz to 2.5 kHz; Filter Q (Range) = variable 1-100; Gain = O dB
  • Notable IC chip: two RCA CA3094E high-current OTAs and one TL022CP op amp (1984); one LM13600N dual OTA and one MC1458CP op amp (1987)
  • Component-side circuitboard images: Jan. 1984 Dec. 1987


  • FX heritage: FX25 FX25B
  • Notable artists using the FX25:


  • During early ZPZ tours (2006-07?), Dweezil Zappa used a FX25 (among other pedals). It was auctioned on eBay in September 2008 after he reconfigured his pedal drawer.
  • During Nine Inch Nail's 2009 tour (and possibly earlier tours), guitarist Robin Finck used a FX25 (among other pedals). It was auctioned on eBay in December 2009.

DOD FX25 Envelope Filter user reviews

Average Score:4.8( 4.8/5 based on 7 reviews )
 6 reviews86 %
 1 user review14 %
Value For Money :
MGR/Brian W.02/23/2002

MGR/Brian W.'s review"DOD Envelope Filter Auto Wah"

DOD FX25 Envelope Filter
I got it at Guitar Center for only 30 bucks! Retail price is about $100 though so others may not be so lucky.

For only 30 dollars, this was an excellent effect. I wanted a wah but couldn't at the time so I got this instead. I love the sound! It makes great wah sounds. And with all knobs at 10, it sounds like a screechin cat! :)

Battery's run out quickly. But that's about it.

It is made of metal, and is pretty lightweight. It actually was dropped on accident on concrete but it was not scratched at all, and the sound was perfect!

If you love funky style music, or you like to have a screamin sound, this is a great pedal for you!

This review was originally published on

moosers's review

DOD FX25 Envelope Filter
The DOD FX25 Envelope Filter comes in a few different versions, but this review is for the older one as shown in the picture.  I believe there is a newer model of the pedal that has three parameters rather than two, but none of them are currently be made anymore.  This is an analog pedal with 1/4 inch connections and powering options for a nine volt battery or power supply.  This isn't rack mountable as it is a stomp box.


Using the DOD FX25 Envelope Filter really couldn't be any simpler.  The pedal has two knobs for range and sensitivity, and that's all that you have to work with with the FX25.  This makes using the pedal extremely user friendly, but does limit what you can do with it a bit.  I don't think that anyone at all with have problems understanding how to use this pedal, but if you are an absolute beginner and aren't sure what the parameters do or mean, the manual should be able to help you out, though I don't think it is necessary.


I haven't used the DOD FX25 Envelope Filter on any sort of recording, but have used the pedal in tandem with a Fender Strat and a '76 Fender Twin Reverb, so I got a pretty clean idea of what the pedal sounds like.  You can definitely do some interesting things with the DX25, but as far as sound quality is concerned, this isn't my favorite pedal.  It isn't as realistic or clean sounding as I would expect more modern versions of the pedal to be.  However, the pedal definitely has some merit as it can be used in a lot of creative ways.  I do wish that it was a bit more versatile, but the basic sounds that you can get are pretty cool and useful.


This version of the DOD FX25 Envelope Filter won't cost you too much money at all if you want to seek out a used one, which is probably the best thing that the pedal has going for it.  It allows users access to some cool auto and envelope filtering at a very low cost.  There are certainly a ton of pedals out there that sound better than this one and are more versatile, but if you want a guitar envelope filter that will cost very little to start off with, the DOD FX25 is something worth checking out for sure.
Audiofanzine FR12/10/2008

Audiofanzine FR's review

DOD FX25 Envelope Filter
(Originally written by adhawen/translated from Audiofanzine FR)
Only one effect... This pedal sounds good although it's a digital effect.

1/4" jacks.


The setting is not simple although you only have two controls. But with a bit of patience you can get good results depending on what you're looking for.


This pedal is not versatile but it sounds great!

Famous players (like Flea, M. Einziger) chose it and there's a reason for that.


It has a strong sound character... It's small brother (FX 25B) doesn't provide the same results. Except for Electro-Harmonix effects nothing is at the same level.

It's a great deal considering its secondhand price but it's very difficult to find one on the market since it's discontinued...

If you find one, buy it without hesitating: it's a collector's item!

adhawen's review (This content has been automatically translated from French)

DOD FX25 Envelope Filter
One effect available ... The pedal is digital but it sounds good.


The settings are not simple (despite only two pots), but with a little patience you get there ... it all depends on what one is looking for.


As said above, it depends on what you want: you have to know where we are going with this pedal but if it is known, it can be quite terrible!
Beautiful people is used (Flea, Mr. Einziger) it's not for nothing.


She still has a sacred grain ... His little sister (FX 25B) does unfortunately not out as well and apart electro-harmonix nothing of it.
Given its argus is a bargain but this is the problem: very difficult to find and at a good price, it is no longer manufactured ...
If you find one, go head down, it's collector!

DOD FX25 Envelope Filter images

  • DOD FX25 Envelope Filter
  • DOD FX25 Envelope Filter
  • DOD FX25 Envelope Filter
  • DOD FX25 Envelope Filter

DOD FX25 Envelope Filter videos

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Other names: fx25 envelope filter, fx25envelopefilter, fx 25 envelope filter, fx25 envelopefilter, fx25, fx 25, fx25envelope filter

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