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Alto Truesonic TS218S Active Subwoofer

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Quick Overview

With an improved build quality, as well high-performance components, the Alto Truesonic TS218S Active Subwoofer ideal for venues looking to increase their speaker setup to a professional standard.


The Alto Truesonic TS218S Active Subwoofer is the largest model in the new and improves TS2 truesonic range. It is the high-performance solution for anyone looking to vastly improve low-end frequencies in large and small scale venues.

The Alto TS218S Subwoofer comes with a peak output power of 1250W and superior-quality class D amplifiers that feature a new innovative cooling system. The cooling system runs clearer and with improved reliability. The lack of a fan cooled system decreases the likelihood of parts corrupting.

In addition to this, the TS218S now comes with two flexible XLR and 1/4inch combo inputs offering you total flexibility in terms of routeing. Also, the two balanced XLR line outputs, offers a clearer, improved outbound signal.

Alto TS218S Features:

  • 1250 watts of peak power output
  • Custom engineered high-efficiency Class D amplifiers with passive cooling design – no fan means the speaker runs cleaner, quieter and has greater long-term reliability
  • 18-inch high-excursion woofer
  • (2) XLR+1/4-inch combo inputs + (2) balanced XLR line outputs
  • Polarity Reverse, Full-Range Output and Extended LF controls
  • Electronic clip, thermal and transducer overdrive protection
  • Rugged, internally-braced front-ported plywood cabinet
  • Integrated 35mm speaker pole socket


  • Output Power: 1250 W peak, 625 W continuous
  • Transducer Low: 18” (457 mm) woofer, 3” (76 mm) voice coil
  • Frequency Response: 35–95 Hz (-10 dB)
  • Maximum SPL: 131 dB (@ 1 m)
  • Connections: (2) XLR+1/4” (6.35 mm) inputs; (2) XLR outputs; (1) IEC power cable input
  • Input Level: Line +4 dBu (nominal)
  • External Controls: Volume control, signal/clip limiter with LED, polarity-reverse switch, high-pass filter bypass switch with LED, extended low-frequency switch with LED, power switch with LED
  • Electronic Protections: Electronic clip, thermal and transducer overdrive protection
  • Enclosure: Internally braced plywood cabinet; 35 mm mounting pole socket ontop panel
  • Power Connection: Standard IEC cable
  • Input Voltage: 110–120, 220–240 V AC; 50/60 Hz
  • Consumption: 450W
  • Fuse: T6.3AL AC250V (110–120 V) or T3.15AL AC250V (220–240 V)
  • Dimensions (W x D x H): 26.8” x 20.7” x 24.8” / 680 x 525 x 630 mm
  • Weight: 70 lbs. / 32 kg

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Alto Truesonic TS218S Active Subwoofer