"Bravo CEA! Subwoofer Spec Should Even the Playing Field" But while this definitely will help a person to choose a sub, using only numbers to pick one is not a good idea. Just like any loudspeaker, each sub has its own individual sound resulting from a myriad of sources i.e. cone material, surround material, motor design, sealed vs. ported vs. bandpass, the subtle sound differences of various amplifier designs, etc etc etc that numbers just cannot describe. And if you use your HT system for music playback this will be especially apparent. The CEA is also working on clarifying specs for surround receiver amps and other confusing issues.