Use this free software to assist you in building your QRD diffuser

QRDude saves you having to get out the calculator to work out the well depth for your diffuser. It will design standard and advanced 1D panels, plus 2D panels, in normal and inverse variations.

QRDude in Advanced Mode demonstrating well shifting, manual well width, half-width end wells, and imperial units.
Screenshot of QRDude software

Features of current version - V3.20

Image of Download Button
QRDude is written in Visual Basic 6 and runs under Windows. It requires a screen width of 1024 pixels or higher
Security information:
Filesize 475,136 bytes
MD5 Hash Code 417B5A99282F20CCABEDC14A10D09F8B
Hash Code Generator to verify software against this value can be downloaded here

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2D panel - default settings
QRDude software 2D panel - default settings
Lobes screen for multiple panels
QRDude Diffusion Lobes screen

Supporting documentation

An illustrated overview of QRD diffusers can be found on the QRD Technical Overview page - it strongly recommended that you read this first.

For detailed instructions on how to use the calculator, see the QRDude User Guide

To see how mine went together, see the Build page

Other free software available on this site

Boxnotes - check your enclosure design for resonances. Print your cutting list
Sonosub - design a cylindrical subwoofer. Check resonances and clearances
Flare-it, - find the correct port flare size to avoid audible turbulence
Subsaver - calculator for finding component values for a 2nd-order high-pass filter

/qrdude.htm last modified: 12 June 2023
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