QSC ISA750 Stereo Contractor Power Amplifier


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Dale #:QSC-ISA750

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This item usually ships within 5-10 days after your order is placed. Your payment will be charged after completing checkout.
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  • Designed as a cost-effective solution specifically for sound contractors, the ISA750 is a low impedance model rated for 2-ohm operation. Versatile loading options and a comprehensive feature set make the ISA Series a rugged, cost-effective power solution for any permanently installed sound system.


    • 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)
    • Class H complementary bipolar output circuitry reduces AC power draw and waste heat by 40%
    • Front panel indicators include power, signal, and clip
    • 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
  • STEREO MODE, Both Channels Driven  
    8 ohms 20 Hz-20 kHz 0.1% THD 450W
    4 ohms 20 Hz-20 kHz 0.1% THD 650W
    2 ohms 1 kHz 1% THD 1200W
    8 ohms 1 kHz 0.1% THD 1500W
    4 ohms 1 kHz 1% THD 2400W
    Signal to Noise (20 Hz-20 kHz) 100 dB
    Distortion (SMPTE-IM) Less than 0.02%
    Input Sensitivity @ 8 ohms 1.07v (+2.8 dBu)
    Voltage Gain @ 8 ohms 56.2x (35 dB)
    Output Circuitry Class H
    Cinema Sound Approval THX
    Weight - Net 47 lbs (21.3 kg)
    Weight - Shipping 53 lbs (24.0 kg)
    Distortion (Typical)
      20 Hz-20 kHz: 10 dB below rated power
      1.0 kHz and below: full rated power
    Less than 0.03% THD, 4 ohms and 8 ohms
    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 (direct outputs) Greater than 200 at 8 ohms, ISA 1350 greater than 250
    Output Regulation (isolated outputs) Less than 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: Red LED (1 per channel)
    Dimensions 19 (48.3 cm) rack mounting, 5.25(13.3cm) tall (3 rack spaces), 
    15.9 (40 cm) deep (from front mounting rails)
    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, 1350 and 800Ti; AC coupling: ISA 280, 300Ti, 450 and 500Ti
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