HS8S 8" Bass Reflex Powered Subwoofer 150W Black8" bass reflex powered subwoofer delivers low frequencies down to 22Hz. Ever since the 1970 the iconic white woofer and signature sound of Yamaha nearfield reference monitors have become a genuine industry standard for a reason their accuracy. Unlike studio monitors with added bass or treble frequencies which may sound more flattering at first, HS Series speakers were designed to give you the most honest, precise reference possible, providing an ideal