Powered-subwoofer specifications have long been a minefield of inconsistency. How deep, how loud can they really play? Consumers may shop with greater confidence now that the Consumer Electronics Association has delivered its long-awaited sub specs. Given the catchy name CEA-2010, the document commands that subs be tested "in a calibrated anechoic [non-echoing] chamber, in a suitable ground plane environment, or in a large calibrated room." Test tones, with one-third octave spacing, are at these frequencies: 20, 25, 31.5, 40, 50, and 63 Hertz. The specs don't cover power ratings, but it will be great for consumers to get standardized information on the acoustic output of powered subs. The end result on spec sheets should look like this:

Ultra-low bass (20-31.5 Hz): XXX.X dB
Low bass (40-63 Hz): YYY.Y dB

The full specification can be purchased for $49 (or $36.75 for CEA members) from the CEA/IHS websites.