Alto Professional TS15S Aktiv subwoofer

2500W Powered Subwoofer for Full-Range PA Systems

The Alto Professional TS15S packs 2500 watts of peak Class D power to anchor any PA configuration. A 15-inch driver with a 3-inch high-temperature voice coil extends low-frequency response down to 36 Hz (-3 dB) and reaches 132 dB SPL at one meter, adding the necessary heft to concert halls, clubs, and houses of worship. Designed and tuned in the USA, this cabinet is Alto Professional's most powerful subwoofer yet.

Onboard DSP and Phase Alignment

What separates this sub from generic 15-inch cabinets is onboard DSP and phase alignment circuitry. User-selectable EQ tunings (Off, Live, DJ) tailor low-end accentuation to the application, while a four-position phase switch (0°/90°/180°/270°) keeps the sub time-aligned with full-range tops. Electronic clip, thermal, and transducer overdrive protection guard the driver and amplifier against the rigors of touring and permanent installs.

Driver and Amplification

The amp and driver combination determines how cleanly a sub reproduces transients at high SPL.

• Amplifier Output: 2500 W peak @ 4 Ω — headroom for outdoor stages and large venues
• LF Driver: 15" (381 mm) woofer, 3" (76 mm) voice coil — handles sustained bass-heavy material without thermal compression
• Maximum SPL: 132 dB @ 1 m — projects cleanly across mid-sized rooms and clubs

Frequency Response and EQ Tuning

Frequency response defines how deep and wide the sub reproduces before rolling off.

• Frequency Response: 36 Hz – 110 Hz (-3 dB) — covers kick drums, bass guitars, and electronic sub-bass
• Frequency Range: 31 Hz – 123 Hz (-10 dB) — usable extension for cinematic and EDM material
• EQ Presets: Off / Live / DJ — switchable voicing without external processing

Connectivity and Physical Specs

Signal flow and physical integration determine how easily a sub drops into an existing rig.

• Inputs: 2 × XLR+1/4" (6.35 mm) combo — accepts balanced line-level signal from mixers or controllers
• Outputs: 2 × XLR thru — passes full-range signal to satellite tops without external splitter
• Enclosure: Internally braced front-ported MDF, 36 mm pole socket — supports standard speaker poles for stacked configurations
• Dimensions: 541 × 523 × 627 mm, Weight: 39.51 kg — single-person load-in for mobile rigs