Alto TS18S | 18in - 137dB | 2500W Powered Subwoofer with DSP & Phase Control

ALTO TS18S  (Alto TS-18S)

Powered Subwoofer

Alto TS18S is a high-powered 18-inch subwoofer engineered for deep, high-SPL bass performance in professional sound reinforcement systems. Designed for touring rigs, installations, and mobile DJs, it delivers thunderous low-end output with advanced DSP control and rugged durability.

Alto TS18S Competitive Differences

• 2500W peak power with 137dB max SPL and 18-inch driver
• Selectable DSP EQ modes and 4-position phase alignment

Alto TS18S Description

The Alto TS18S delivers extreme low-end performance for venues, events, and mobile systems that demand clarity and power. Its 2500-watt Class D amplifier powers a premium 18-inch woofer with a 3-inch high-temperature voice coil—producing up to 137dB of tight, impactful bass. Built with an internally braced MDF cabinet, the TS18S minimizes unwanted resonance while maximizing low-frequency response. Its front-ported design ensures smooth airflow and solid bass projection, while the 36 mm pole socket allows easy integration with full-range speakers. This sub is more than just power—it’s smart. Onboard DSP includes user-selectable EQ presets (Off, Live, DJ) to fine-tune the output for your specific application, along with a 4-position phase alignment switch (0°, 90°, 180°, 270°) for seamless blending with tops in any setup. With combo XLR/TRS inputs, XLR thru outputs, and electronic protections against clipping, overheating, and overdrive, the TS18S is built to handle demanding environments night after night.

Model Features

• 2500W peak Class D amplifier with high-efficiency design
• 18-inch woofer with 3-inch high-temperature voice coil
• Max SPL: 137dB for powerful low-end performance
• DSP EQ modes: Off, Live, DJ for different applications
• Phase alignment switch: 0°, 90°, 180°, 270°
• (2) XLR+1/4” combo inputs and (2) XLR link outputs
• Rugged MDF cabinet with 36mm pole socket and braced design
• Mark-resistant finish and caster-ready bottom panel
• Electronic protections: clip, thermal, overdrive

Model Specifications

• Max SPL: 137dB (@1m)
• Power Output: 2500W peak
• Frequency Response: 35 Hz – 100 Hz (-3 dB)
• Frequency Range: 27 Hz – 111 Hz (-10 dB)
• Driver: 18in (457 mm) woofer with 3in (76.2 mm) voice coil
• Dimensions: 26.7 x 20.9 x 24.7 in (678.2 x 530.9 x 627.4 mm)
• Weight: 93.0 lb (42.2 kg)

What's In The Box

• Alto TS18S subwoofer
• Power cable
• Quick start guide