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...

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

The online community for car audio beginners, enthusiasts and professionals. Find, compare and review the hottest car audio components, installers and installation shops in the world. Buy or sell your car stereo gear in our free online classifieds, s...

Find an audio system or speakers for your home and car at PolkAudio.com.

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

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

Get free Shipping on everything $49 and up until December 25th! Call 1-800-319-8943 for custom-tailored advice audio/video electronics for the Car and Home.

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Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.

Bimmerforums is the preferred online community for BMW owners. You will find technical how-to information, maintenance specifics, audio advice, wheel and tire combinations, and model specific details not found anywhere else.