When you are shopping for an active subwoofer (also referred to as a powered subwoofer), there are several important things to keep in mind. Just like with passive subs, an active subwoofer may be specialized for use in your home stereo or studio (as opposed to a car subwoofer or pa system) and will be found in popular sizes like 8", 10", 12", 15" and 18". Smaller subs will have more "punch" while larger subs will produce deeper and richer bass. There are many good choices these days, from folks like Yamaha, JBL, Focal, Tannoy, Genelec, and others. Some of the best selling subs are the M-Audio BX10s, JBL LSR4312SP, Yamaha HS10W, Tannoy TS12 and Samson Rubicon R10s. So if you are in the market for a new sub, we would encourage you to check out the reviews on these popular models and see which active subwoofer is best for you.