top of page
QSC ISA750
QSC ISA750 
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
Two-tier Class H complementary bipolar output circuitry reduces AC power draw and waste heat by 40%
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

QSC ISA750

$1,315.00Price
  • SPECIFICATIONS ISA280 ISA450 ISA750 ISA1350 ISA300Ti ISA500Ti ISA800Ti
      OUTPUT POWER PER CHANNEL, STEREO MODE, both channels driven
    8Ω, 20 Hz–20 kHz 0.1% THD
    4Ω, 20 Hz–20 kHz 0.1% THD
    2Ω 1 kHz 1% THD    		 185 W
    280 W
    430 W    		 260 W
    425 W
    700 W    		 450 W
    650 W
    1200 W    		 800 W
    1300 W
    2000 W    		 185 W
    280 W
    430 W    		 260 W
    425 W
    700 W    		 450 W
    650 W
    1200 W
      DIRECT POWER PER CHANNEL, STEREO MODE
    70V, 20 Hz–20 kHz +0/-0.3 dB 0.5% THD - - - 1500 W - - -
      TRANSFORMER-ISOLATED OUTPUT POWER PER CHANNEL, STEREO MODE
    70V or 100V, 50 Hz–16 kHz 0.5% THD
    25V, 50 Hz–16 kHz 0.5% THD    		 -
    -    		 -
    -    		 -
    -    		 -
    -    		 300 W
    200 W    		 500 W
    300 W    		 800 W
    500 W
      OUTPUT POWER, BRIDGED MONO MODE
    8Ω, 1 kHz 0.1% THD
    4Ω 1 kHz 1% THD    		 600 W
    830 W    		 900 W
    1400 W    		 1500 W
    2400 W    		 2800 W
    4000 W    		 600 W
    830 W    		 900 W
    1400 W    		 1500 W
    2400 W
      TRANSFORMER-ISOLATED OUTPUT POWER, BRIDGED MONO MODE
    140V or 200V, 50 Hz-16 kHz 0.5% THD - - - - 600 W 1000 W 1600 W
    Signal to Noise (20 Hz-20 kHz) 100 dB
    Distortion (SMPTE-IM) Less than 0.01% Less than 0.01% Less than 0.02% Less than 0.01% Less than 0.01% Less than 0.01% Less than 0.02%
    Input Sensitivity @ 8 ohms 1.15 V
    (+3.4 dBu)    		 1.07 V
    (+2.8 dBu)    		 1.07 V
    (+2.8 dBu)    		 1.24 V
    (+4.1 dBu)    		 1.15 V
    (+3.4 dBu)    		 1.07 V
    (+2.8 dBu)    		 1.07 V
    (+2.8 dBu)
    Maximum Voltage Gain 33.4×
    (30.5 dB)    		 44.7×
    (33 dB)    		 56.2×
    (35 dB)    		 64.0×
    (36.1 dB)    		 33.4×
    (30.5 dB)    		 44.7×
    (33 dB)    		 56.2×
    (35 dB)
    Output Circuitry Class AB Class AB Class H, 2 tier Class H, 3 tier Class AB Class AB Class H, 2 tier
    THX Approved - Yes Yes - - - -
    Weight - Net 36 lb
    (16.3 kg)    		 42 lb
    (19 kg)    		 47 lb
    (21.3 kg)    		 68 lb
    (30.8 kg)    		 44 lb
    (20.0 kg)    		 49 lb
    (22.3 kg)    		 57 lb
    (26 kg)
    Weight - Shipping 42 lb
    (19.1 kg)    		 48 lb
    (22 kg)    		 53 lb
    (24.0 kg)    		 77 lb
    (34.4 kg)    		 50 lb
    (22.7 kg)    		 55 lb
    (25 kg)    		 63 lb
    (28.6 kg)
      ALL MODELS
    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    		 ISA 280, 450, 750 and 1350: 
    20 Hz–20 kHz, +0/-1 dB; -3 dB points: 5 Hz and 50 kHz    		 ISA 300Ti, 500Ti and 800Ti: 
    Direct outputs: -3 dB @ 50 Hz, -0.5 dB @ 20 kHz; XF outputs: 50 Hz–16 kHz, +1/-3 dB
    Damping Factor with 8Ω Load (direct outputs) Greater than 200; ISA 1350 greater than 250
    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; Triac crowbar: ISA 750, 1350, and 800Ti; AC coupling: ISA 280, 300Ti, 450, and 500Ti
bottom of page