Check the listing for details. Yamaha HS8S | 8in Powered Studio Subwoofer - 150W. Condition: New. Listed at 499.99 USD. Constructed with a dense MDF enclosure and a traditional three-way mitered joint design, the HS8S minimizes unwanted cabinet resonance while maximizing durability. Yamaha’s advanced port design further reduces airflow noise by up to 6dB, ensuring transparent low-end detail without distortion.