QSC ISA450 2-Channel Commercial Power Amplifier

  • $800.00

The ISA Installed System Amplifiers are designed to meet the needs of sound system designers and contractors worldwide. Three models feature isolated 25, 70, and 100 volt outputs for distributed sound systems, while four low impedance models are rated for 2 ohm operation. The ISA 1350 drives 70 volt lines directly with 1500 watts per channel. Versatile loading options and a comprehensive set of features make the ISA Series a rugged, cost-effective power solution for any permanently installed sound system.

  • Rear panel gain controls for tamper resistance; 2-dB detents allow 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 (30 Hz or 70 Hz) protect speakers and prevent speaker transformer saturation with minimal effect on program material
  • Front panel LED indicators include power, signal, and clip
  • Covered barrier strip output connectors for safety agency compliance
  • Cutomatic on-demand variable-speed fan: quiet normal operation, with maximum cooling when needed
  • Rear-to-front air flow helps keep 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
8Ω, 20 Hz–20 kHz 0.1% THD 260 W
4Ω, 20 Hz–20 kHz 0.1% THD 425 W
2Ω 1 kHz 1% THD 700 W
8Ω, 1 kHz 0.1% THD 900 W
4Ω 1 kHz 1% THD 1400 W
Signal to Noise (20 Hz-20 kHz) 100 dB
Distortion (SMPTE-IM) Less than 0.01%
Input Sensitivity @ 8 ohms 1.07 V (+2.8 dBu)
Maximum Voltage Gain 44.7× (33 dB)
Output Circuitry Class AB
Weight - Net 42 LB
Weight - Shipping 48 LB
Distortion (Typical)
20 Hz–20 kHz: 10 dB below rated power Less than 0.03% THD, 4 ohms and 8 ohms
1.0 kHz and below: full rated power Less than 0.03% THD, 4 ohms and 8 ohms
Frequency Response 10 dB below rated output power 20 Hz–20 kHz, +0/-1 dB; -3 dB points: 5 Hz and 50 kHz
Damping Factor with 8Ω Load (direct outputs) Greater than 200
Output Regulation (isolated outputs) Less than 1.5 dB
Input Impedance 10 kΩ unbalanced, 20 kΩ balanced
Input Clipping 10 V rms (+22 dBu)
Cooling Continuously variable speed fan, back-to-front air flow
Connectors, each channel

Input: Active balanced; 3-pin Euro-style detachable terminal block and XLR (pin 2+)

Output: Covered barrier strips 

DataPort V2: HD-15 connector


Front: AC switch

Rear: Ch. 1 and Ch. 2 gain knobs, 10-position DIP switch

Indicators PWR-ON: Green LED; SIGNAL: Green LED (1 per channel); CLIP: Red LED (1 per channel)
Dimensions (HWD) inches 5.25 x 19 x 15.9 / 3RU
Amplifier Protection Full short circuit, open circuit, thermal, ultrasonic, and RF protection; Stable into reactive or mismatched loads
Power Requirements 120 or 230 VAC, 50–60 Hz
Load Protection On/off muting; Triac crowbar: ISA 750, 1350, and 800Ti; AC coupling: ISA 280, 300Ti, 450, and 500Ti

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