The best gigs require the best sound reinforcement at all ends of the sound spectrum. For tight, punchy low-end, look no further than the Alto Professional TS15S active subwoofer. When added to your full-range speaker setup, the TS15S delivers powerful yet controlled low-end presence to your PA configuration for a complete listening experience for the modern public music venue. With an active subwoofer, any music performance takes a giant leap forward in tonal balance with the perfect blend of high, mid and low frequencies.