QSC ISA450 Professional Power Amplifier

PA SKU # QSC ISA450 MFR # ISA450 UPC # 684284003911
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  • Product Highlights
  • Rear Panel Gain Control
  • XLR & Euro-Style Input Connectors
  • DataPort V2
  • Defeat-able Clip Limiters
  • HP Filters 50 or 70Hz
  • 3 Year Warranty
Model 280 450 300Ti 500Ti 750 800Ti 1350

ISA450 Professional Power Amplifier

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
  • Automatic 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
  • OUTPUT POWER PER CHANNEL, STEREO MODE, both channels driven
  • 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
  • OUTPUT POWER, BRIDGED MONO MODE
  • 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: 44.7x (33 dB)
  • Output Circuitry: Class AB
  • THX Approved: Yes
  • Weight - Net: 42 lb (19 kg)
  • Weight - Shipping: 48 lb (22 kg)
  • 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
  • Controls
  • 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
  • Dimensions (HWD) mm: 133 x 483 x 400 / 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; AC coupling
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