10 pages

Car Audio Reference Charts

Dense reference tables drawn from published resistance and ampacity tables, the Thiele/Small alignment relations and manufacturer specifications. Every table names its source and says whether the figures are published or a convention.

• Amplifier Current Draw Chart Amplifier current draw by RMS power for class D and class A/B amplifiers, using the efficiency conventions behind every fuse and w
• Amplifier Fuse Size Chart The main fuse size chart for amplifier power wire, sized to protect the wire's NEC ampacity rating rather than the amplifier itsel
• Big 3 Wire Size Chart Big 3 upgrade wire size by alternator output, covering the NEC ampacity minimum and the heavier gauge most installs actually run.
• Cone Area (Sd) Chart Cone area (Sd) by nominal subwoofer size: effective diameter convention, square inches per driver, and combined Sd for two, three,
• Gain Setting Voltage Chart Gain setting voltage chart: target output voltage from RMS power and load for 0.5 to 8 ohms, the inverse power check, and the true
• Port Area & Velocity Chart Port area chart: the 12 to 16 square inch per cubic foot convention plus the port velocity formula, sample lengths, and the 17 met
• SPL vs Power Chart SPL versus power chart: sensitivity plus 10 log watts for 10, 12, and 15 inch subs, the 3 dB doubling rule, and cabin gain as a la
• Wiring Impedance Chart Full series and parallel impedance chart for one to four subwoofers at SVC 2, SVC 4, D2 and D4, showing the final ohm load for eve
• Voltage Drop Chart Voltage drop by wire gauge, current, and run length for 12-volt car audio systems, using the return-path formula installers actual
• Wire Gauge Ampacity Chart The full NEC copper wire ampacity and resistance chart from 18-gauge to 4/0-gauge, plus the gauge car audio installers actually ru