It is capable of producing up to 2,700 strokes per minute. They have a fancy trademarked 'noise channel' for any large speaker on below that in fact redirects the particular noise waves right at you, boosting the overall excellent quality. The 110mm (4.33-inch) woofer is AE's spun aluminum cone with a die-cast magnesium chassis and twin neodymium magnet. These can easily be found through online auctions.