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


Features of current version - V3.10

QRDude requires a screen width of 1024 pixels or higher


Click the image to download QRDude
QRDude is written in Visual Basic 6 and runs under Windows.
Security information:
Filesize 425,984 bytes     MD5 Hash Code 8ad699026ee3c632fac4f0432969e771
If you don't have them installed, you may need to grab the VB6 Runtimes - Windows XP already has them.



2D panel - default settings
2D panel - default settings


Lobes screen
Lobes screen for multiple panels


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.   (note: heavy graphics)

For detailed instructions on how to use the calculator, see the QRDude User Guide   (note: heavy graphics)

Changes to the software are tracked in the Version notes


Other 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

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You can help to improve this site - use the feature request page to suggest changes to content or navigation.      Updated 22nd October 2010