ISA Series

Commercial Amplifiers

ISA amplifiers are an ideal, cost-effective solution for fixed installation applications requiring low impedance or distributed loudspeakers. There are seven models in the line, four low impedance models (ISA 280, ISA 450, ISA 750, ISA 1350) rated down to 2-ohm loads and three “Ti” versions (ISA 300Ti, ISA 500Ti, ISA 800Ti) featuring isolated transformers for 25, 70 and 100 volt distributed audio systems. The DataPort V2 Lite connection facilitates the use of amplifier accessories (XC-3, LF-3 and SF-3.) providing economical crossover and subwoofer filtering solutions.

  • Up to 2400W total output power
  • 3RU chassis with rear-mounted gain controls featuring 2 dB detents
  • Independent, defeatable clip limiters reduce distortion and protect speakers
  • Selectable high-pass filters protect against transformer saturation and driver overexcursion
  • Includes extensive DC, infrasonic, thermal overload, and short circuit protection
  • XLR and 3-pin Block input connectors and touch-proof barrier-strip outputs
  • DataPort V2 connector not compatible with Q-SYS, BASIS or CM16a

The products listed on this page have been discontinued. Please check with your Q-SYS regional sales representative for remaining stock availability.

Consider the CX-Q Series network amplifiers as a replacement:

  • The CX-Q Series combines a legacy of robust power amplifiers in high-efficiency output devices, and native network transport, control, and monitoring capabilities.
  • Features four-channel and eight-channel models, delivering customized power output loading and a total maximum power of up to 8000 W




Model 70V*/100V 8Ω** 4Ω** 2Ω***  
ISA280 - 185 W 280 W 430 W Details
ISA450 - 260 W 425 W 700 W Details
ISA750 - 450 W 650 W 1200 W Details
ISA1350 1500 W*** 800 W 1300 W 2000 W Details
ISA300Ti 300 W 185 W 280 W 430 W Details
ISA500Ti 500 W 260 W 425 W 700 W Details
ISA800Ti 800 W 450 W 650 W 1200 W Details

*50 Hz – 16 kHz, 0.5% THD 

**20 Hz – 20 kHz, 0.1% THD †1 kHz, 1% THD
***Direct Output, 70V, less than 0.1% THD, 20 Hz – 20 kHz, +0/-0.3 dB

All specifications are subject to change without notice.