• Electrical Formulas - Great stuff on the HO Alternators website

• Wiring Diagrams - From the Rockford website

• Tutorials -  From the JL Audio website

• Useful Information - From the Car Stereo.com help section

• Subwoofer Box Calculator - Another Car Stereo.com "How To"

• Calculate Anything - For the true Geeks in this world

• RE Box Tuning Calculator - From RE Audio website

• Killer Formula Chart - From Sengpielaudio.com website

• Wiring, Diagrams and Tech - The 12volt.com

• Car Audio Basics - Caraudiohelp.com

• How to wire multiple batteries - Smart Guage

• What fits my vehicle - Metra Online