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All the software and the designs on subwoofer-builder.com are completely free
If you wish to give thanks, you are encouraged to make a small donation to the charity of your choice. If you can't think of a charity, may I suggest Medecins San Frontieres or The International Red Cross
Thanks to the following donors, $50 has been given to charity:
Tim from Bakersfield, USA
Terry from Geelong, Australia
You can also send me a "Warm Fuzzy" by letting me know about your donation...
Originally there was a form here to make feedback easier, but the spammers found the script and buried me under tons of rubbish.
This means reverting to normal email. I can at least launch your mail software for you, but you will need to enter the following address into your email manually.