Alto Professional TS18S — Powerful Subwoofer for Professional Sound Reinforcement Professional sound reinforcement requires excellent sound quality across all frequencies, but it is the powerful, precise bass that forms the foundation of every successful performance. The Alto Professional TS18S is the flagship active subwoofer from the Truesonic series, delivering dynamic and controlled low-end frequencies, transforming any PA configuration into a complete sound reinforcement system. This subwoofer with a peak power of 2500 watts brings concert halls to life, clubs pulsate with energy, and places of worship gain depth in instrumental performances. Product Features The TS18S stands out from the competition thanks to its high-performance Class D amplifier, which generates up to 2500 watts of peak power at 4Ω. The 18-inch (457 mm) low-frequency driver with a 3-inch (76.2 mm) high-temperature voice coil ensures incredible bass depth while maintaining full control over low frequencies. A maximum sound pressure level (SPL) of 137 dB guarantees that the bass reaches every corner, even in the largest spaces. Versatile Configuration for Every Environment The TS18S subwoofer was designed with flexibility and easy integration into existing sound reinforcement systems in mind. Three EQ correction modes — Off, Live, and DJ — allow for quick adjustment of the low-frequency response to suit the type of music being played and the room's acoustics. A phase alignment switch with options for 0°, 90°, 180°, and 270° enables precise synchronization of the subwoofer with full-range speakers, eliminating issues with destructive interference of sound waves. Dedicated XLR+6.35 mm Jack inputs and XLR outputs ensure seamless connection with any speaker systems. Applications Concert Halls — powerful bass for large-scale musical events and festivals Dance Clubs and Nightclubs — deep, pulsating low-end driving the energy of the dance floor Places of Worship and Religious Venues — reinforcement for instruments and vocals Fixed Installations — permanent sound reinforcement systems in venues and event halls Mobile Setups — ideal concert subwoofer for touring bands Public Spaces — sound reinforcement for outdoor events and trade shows Detailed Technical Specifications Peak Power: 2500W @ 4Ω Low-Frequency Driver: 18" (457 mm) with 3" (76.2 mm) voice coil Frequency Response: 35 Hz – 100 Hz (-3 dB) Frequency Range: 27 Hz – 111 Hz (-10 dB) Maximum SPL: 137 dB (@1 m) Inputs: 2x XLR+6.35 mm Jack (combo) Outputs: 2x XLR (thru) EQ Correction: Off / Live / DJ Protection: Clip, thermal, transducer overload Dimensions: 678.2 x 530.9 x 627.4 mm Weight: 42.2 kg Materials and Construction The TS18S subwoofer is built for durability and reliability under the most demanding concert conditions. The MDF enclosure with internal bracing eliminates unwanted resonances, ensuring clean and precise low-frequency sound. The scratch- and chip-resistant finish guarantees a professional appearance even after years of intensive use. A 36 mm mounting socket on the top panel allows for direct mounting of full-range speakers, creating a compact and stable speaker stack. Threaded M6 holes allow for the installation of transport wheels. Package Contents Alto Professional TS18S active subwoofer IEC power cable User manual Summary The Alto Professional TS18S is a subwoofer that meets the expectations of even the most demanding professionals in the sound reinforcement industry. The combination of 2500 watts of power, an 18-inch driver, and advanced configuration features makes this subwoofer an ideal choice for DJs, rental companies, fixed installations, and performing artists. Whether you are reinforcing a small concert, a dynamic DJ set, or a large-scale event, the TS18S delivers the bass that will move your audience.