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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
In Australia, any donations to The Smith Family are most welcome.

You can also send me a "Warm Fuzzy" by letting me know about your donation...
I can launch your mail software for you, but you will need to enter the following address into your email manually.