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Classi PEQ Filter PCB Passive Equalizer - Configurator

Price as configured:
30,72 €
(25,82 € excl. vat)
Recommended retail price: 49,95 €
You save 38%, that is 19,23 €
including VAT., plus shipping
  • In stock!
  • Shipping time: 1 - 2 workdays
PEQ Inductor
PEQ Inductor
All Caps & Accessories for Filter Board
All Caps & Accessories for Filter Board

includes all and finest styroflex caps, resistors, wires, pcb-connectors for the classi filter board

PEQ OPA Gainstage Kit
PEQ OPA Gainstage Kit
PEQ Rack Kit
PEQ Rack Kit

Enclosure with engraved and drilled Back-Panel incl. IEC and Neutrik Goldplated XLR jacks. Inclusive PEQ Classic Frontpanel, blue engraved

EQP-1A Classic Knob Set
EQP-1A Classic Knob Set

* Mandatory fields

Item no.
Product weight
  • 0,02 kg
Shipping weight
  • 0,10 kg

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  2. Inductor RM8 - PEQ 312mh,155mh,78mh,39mh,26mh Standard, none
    Inductor RM8 - PEQ 312mh,155mh,78mh,39mh,26mh Standard, none

    Average Rating: 5/55
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The Classi Filter PCB is a brandnew enhanced quality Filter version to build up a classic passive tube or FET powered equalizer. It supports sweet sounding RM or EF inductors and it has a row to use original EQP-1A inductors as-well. This filter PCB works well together with the Classi PEQ OPA based Gainstage or a G-Pultec tube based power supply as well. It supports all EQP-1A Frequencies and the Frequencies of the G-PEQ as-well. The design supports the finest cap selection of Styroflex and WIMA-MKS4 caps for the filter signal path. This PCB will take your project to the next level. It is an over a long time improved design with love in detail.

Check our Full Gain Stage Kit with all necessary building parts


  • Optimized grounding 
  • Easy wiring
  • High-Shelf Function
  • Reproduction of the classic EQ frequencies plus a wide band of enhanced frequencies that can be used as well.
  • Narrow to wide bandwidth control
  • Linear Frequency-Spectrum
  • Easy to build
  • Multiple Channels fit in 1HE enclosure with Classi OPA Gainstage.
  • Supports Styroflex and WIMA-MKS4 Caps
  • Supported Caps spacings: 5mm 7,5mm and 10mm
  • Optional Iron Transformer Output, Lundahl or Edcor
  • 2 Layer quality design
  • Audiophile signal path design

Provided Frequencies

Low Frequencies:  20Hz, 30Hz, 40Hz, 60Hz, 100Hz (optional 90Hz), 120Hz

High Frequencies:  1K, 1K5, 2K, 3K, 4K, 5K, 8K, 10K, 12K, 14K, 16K

Atten Select:  2K, 5K (optional 4K), 8K, 10K (optional 12K), 16K, 20K

Check our Full Gain Stage Kit with all necessary building parts:
PEQ Gainstage

Example Units:
PEQ Pultec Equalizer DIY

Wiring Instructions in our Blog:


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"My two Classi PEQs 2HE - Awesome sound!"

"Well done Don-Audio - Great documented, awesome project! "

"MEQ1 in Stereoausführung"

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Ratings from users

  • 5 Stars: 50% (2)
  • 4 Stars: 0% (0)
  • 3 Stars: 0% (0)
  • 2 Stars: 0% (0)
  • 1 Star: 0% (0)
Average product review: Average Rating: 5/55

(This product has got 4 Reviews| View more ratings in other languages)

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The most useful review
  1. Average Rating: 5/55 Sagi S. Wrote at 30.07.2015
    1 from 1 Customers found the following product review helpful:
    Don-Audio Classi PEQ Filter With Inductor RM8 - PEQ. True Vintage-Blue
    Finished the build of the Don-Audio Classi PEQ.
    Very fun DIY project for building with amazing results,the PEQ sound very musical and the RM8 Custom Don-audio Inductor i chose sounds exactly like described very natural, transparent sound more to add i installed the Don-Audio IRON - Transformer Output Module with Lundahl LL5402 that really emphasis the RM8 Inductor, with anther description by Don-Audio to be audiophile Inductor
    that sounds very clean and naturally

    Very recommended and must be heard......

    In every way true masterpiece design by Don-Audio, im very pleased with the sound result for Drums, Bass, Loops, Synth leads, Guitars Vocals.....Definitely usable in a wide range of sound applications.
    Mid-range sounds is very beautiful with warm low-end with that big Bass Drum sound when needed.....high-end is sparkle to focused
    Already planning to build anther one for Stereo use.
    And the look of the PEQ True Vintage-Blue

    In every way Highly recommended DIY project With Amazing Sound Results !!

    Thanks Don-Audio
More product reviews
  1. Average Rating: 5/55 Joan M. Wrote at 11.11.2015
    Great sound, easy to assemble
    Ive just finished building a stereo Classi PEQ using Aarons full kit and must say Im impressed not only with PCB quality but also labelling components and attention to detail. Its almost impossible to solder it wrong!

    Ive chosen RM8 inductors as I wanted not to be too much colored sounding and Im very happy with them: boosting highs never sounded so sweet, not harsh like plugins and poorly designed EQs but detailed and elegant.

    Of course Classi PEQ allows me to do the PEQ trick boosting and cutting lows sounding fat, dense and warm.

    Thanks Aaron for putting out such great product!

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* All prices are final prices in EUR including the valid value added tax/VAT.