Yamaha HS8S Powered Studio Subwoofer 8" + (3) XLR to XLR Cables Yamaha HS8S Powered Studio Subwoofer. (3) Strukture PRO20M7 Heavy Duty XLR to XLR Cables - 20 ft Cables. 8inch bass-reflex powered subwoofer. 22Hz - 150Hz frequency response.