Dynaudio 9S True Bass Powered Studio Subwoofer (Single) - 9.5"End the Low end Guesswork Are you making educated guesses as to what's going on in the bottom octave of your recordings? It may be time to add a subwoofer to your monitor setup. The Dynaudio 9S is a studio grade subwoofer that extends your monitoring down to 22Hz. That's low enough to feel the crush of a well recorded kick drum or the full weight of the low B on a 5 string bass. The 9S features Dynaudio's proprietary MSP long throw woofer in a sealed