HEATKEYS

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

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.

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

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

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...

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.

SpeakerBuilding.com is a resource for DIY loudspeaker design and construction.

Atrend is the global leader in subwoofer enclosures. Our speaker boxes are manufactured by our staff of experienced audio professionals. We bring the boom so you don

The Subwoofer Design Toolbox by MFR Engineering is an easy to use but powerful program for designing subwoofers. The Car Stereo Cookbook explains how to design, choose and install car stereo systems.