Why determine Classes by woofer cone area instead of power?
Policing the actual rated power of an amplifier has long been the unsolved riddle of car sound competitions. Almost every day were asked questions regarding what power rating to use when determining the total output power of a competition system. Is it the RMS rating? Is it the 12-volt or 13.8-volt rating? Is it the stereo or bridged mono rating? Power, if there were some actual industry standard by which to measure it, would have created a level playing field for all competitors. But such is not the case. What remains is confusion! The woofer cone area Classifications are intended to remove this confusion by simply: measuring the nominal outside diameter of the woofers in the system, multiplying by the number of them being used, and determining the Class to compete in by looking at where it fits in the chart at the back of this book. Its that Simple! Weve even done the maths for you! Just see the chart at the end of these rules. The physics of a speaker are, in varying degrees, power
