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ISA 450

The QSC ISA-450 is a 3RU rackmount power amplifier designed specifically for sound contractors as a low impedance solution rated for 2-ohm operation at 700 watts per side, or 260 watts at 8 ohms. The versatile loading options, feature set and protection circuitry.

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30 other products in the same category:


  • Four models for low-impedance applications
  • ISA 1350 drives 70V lines directly with 1500 watts / channel
  • Three "Ti" versions include low-impedance and isolated 25, 70, and 100 volt outputs for distributed audio systems
  • Rear panel gain controls for tamper resistant operation with 2 dB detents for quick and repeatable settings
  • XLR and detachable Euro style input connectors
  • DataPort V2 for use with DPV2-compatible signal processing accessories (XC-3, SF-3, LF-3) and DSP-3/DSP-4 (with external power supply)
  • Independent defeatable clip limiters for reduced distortion
  • Selectable high-pass filters protect speakers and prevent speaker transformer saturation with minimal effect on program material (30 Hz or 70 Hz on non-"Ti" models, 50 Hz or 75 Hz on "Ti" models)
  • Class H complementary bipolar output circuitry reduces AC power draw and waste heat by 40% on ISA 750 and 800Ti, and by 50% on ISA 1350
  • Front panel indicators include power, signal, and clip (and protect on ISA 1350)
  • Covered barrier strip output connectors for safety agency compliance
  • Automatic variable-speed fan for quiet normal operation with maximum cooling on demand
  • Rear-to-front air flow keeps equipment racks cool
  • Stereo, Bridge, or Parallel operating modes
  • Comprehensive protection circuitry including DC, infrasonic, thermal overload and short circuit protection
  • 3-year warranty plus optional 3-year extended service contract.


Power RatingStereo @ 2 ohms: 700W per channel
Stereo @ 8 ohms: 260W per channel
Bridged @ 8 ohms: 900W
Damping Factor>200 @ 8 ohms
Input Sensitivity1.07Vrms
Input Impedance10 kOhm/20 kOhm (unbalanced/balanced)
Frequency Response20Hz to 20kHz, +/-1dB
Signal-to-Noise Ratio100dB (20 Hz - 20 kHz)
Total Harmonic Distortion (THD)<0.03%, 4 and 8 Ohms, 20 Hz - 20 kHz, 10 dB below rated power
Input Connections2 x 3-pin XLR Female, Balanced
2 x 3-pin Detachable EuroBlock
1 x HD-15 DataPortV2
Output Connectors2 x Covered Barrier Strips
Controls Front Panel1 x Power Switch
Controls (Rear)1 x 10-Position DIP Switch Set
2 x Ch.1, 2 Gain Knobs
Indicators2 x Red Clip LED
2 x Green Signal LED
1 x Green Power LED
CoolingContinuously variable speed fan, back-to-front air flow
Power Consumption0.5A at idle
3.7A at 1/8 Power, 8 ohms
9.3A at 1/8 Power, 2 ohms
Dimensions19 x 5.25 x 15.9" (483 x 133 x 400mm)
Weight42 lb (19 kg)
SpecialtiesStable into reactive or mismatched loads
Rear Panel Controls
Comprehensive Protection Circuitry









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