HEATKEYS

Car audio technical information with more than 125 individual pages, 50+ calculators and wav files. The covered topics range from basic electronics theory to more advanced topics such as speaker impedance as it relates to frequency, damping factor a...

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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.

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

This page contains basic information that will help you design and build your own subwoofer

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