QSC ISA450 - 425W 2-Channel 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.

Features

• 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

Specifications

• 8 ohms 20Hz-20kHz 0.1% THD: 260W
• 4 ohms 20Hz-20kHz 0.1% THD: 425W
• 2 ohms 1kHz 1% THD: 700W
• Bridged Mono 8 ohms 1kHz 0.1% THD: 900W
• Bridged Mono 4 ohms 1kHz 1% THD: 1400W
• 140V or 200V 50 Hz-16kHz 0.5% THD: 600W
• Signal to Noise (20Hz-20kHz): 100 dB
• Distortion (SMPTE-IM): < 0.01%
• Input Sensitivity @ 8 ohms: 1.07v (+2.8 dBu)
• Voltage Gain @ 8 ohms: 44.7x (33 dB)
• Output Circuitry: Class AB
• 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, 10dB below rated output power: 20Hz-20kHz, +0/-1dB, -3dB points: 5 Hz + 50 Hz
• Damping Factor (Direct Outputs): > 250 @ 8 ohms
• Output Regulation: < 1.5 dB
• Input Impedance: 10 k ohms unbalanced, 20 k ohms balanced
• Input Clipping: 10 Vrms (+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 RedLED (1 per channel)
• Amplifier Protection: Full short circuit, open circuit, thermal,ultrasonic, and RF protection; Stable into reactive or mismatched loads
• Power Requirements: 120, 230, VAC, 50-60 Hz
• Load Protection: On/off muting; Triac crowbar: ISA 750
• Rack-mount size: 3 RU
• Dimensions: 19" x 5.25" x 15.9" (48.3 x 13.3 x 40 cm)
• Weight: 42 lbs. (19 kg)