HEATKEYS

Provides bandpass, sealed and vented subwoofer box design software and science, math and engineering programs and freeware

YouTube is a place to discover, watch, upload and share videos.

Car audio help offers free information on car audio, car stereo, mobile video, satellite radio, a free newsletter and specialty articles on various topics from buying and installing car stereo equipment to maintaining and troubleshooting.

The premier site for high end mobile audio discussion and product reviews.

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Australian DIY subwoofer and active filter builder gives tips on construction of subwoofers, SPL meter usage and Home Theater setup

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This is a discussion forum dedicated to Home Theater and the products used.

DIY Audio and Video: FAQs, Tutorials, and Calculators for Speaker Boxes, Crossovers, Filters, Wiring and more.

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Yahoo! Answers is a new way to find and share information. You can ask questions on any topic, get answers from real people, and share your insights and experience.