2nd gen HOP ACFM woofer optimised for Sony EXTRA BASS circuitry. PEI Balanced Dome Tweeter. 270 W peak/45 W RMS power handling. Rubber-coated surround for minimised distortion, Not satisfied with OEM coaxial speakers that sound muffled under your knees? Try our XS-FB1621C component speakers. The balanced dome tweeters give clear vocals at ear-level while the 2nd generation HOP ACFM woofer provides deep, punchy bass with high power handling.