The best performances require the best sound reinforcement across the entire sound spectrum. The Alto Professional TS15S is an active subwoofer that delivers powerful, impactful bass. The TS15S subwoofer complements your full-range speaker setup and adds a strong yet controlled low-frequency presence to your PA configuration, providing a comprehensive and complete listening experience for modern public music venues. With an active subwoofer, every musical performance takes a significant leap in sound balance with the perfect blend of high, mid, and extended low frequencies.