QSC ISA1350 2-Channel 1500W 70V 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.

QSC ISA1350 Features

• Drives 70V lines directly with 1500 watts per channel
• 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
• Three-tier Class H complementary bipolar output circuitry reduces AC power draw and waste heat by 50%
• Front panel indicators include power, signal, clip and protect
• 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

• QSC ISA1350 2-Channel 1500W 70V Power Amplifier1
• Three Year Warranty plus optional 3-year extended service contract1

• OUTPUT POWER PER CHANNEL, STEREO MODE, both channels driven
  • 8Ω, 20 Hz–20 kHz 0.1% THD: 800W
  • 4Ω, 20 Hz–20 kHz 0.1% THD: 1300W
  • 2Ω 1 kHz 1% THD: 2000W
• OUTPUT POWER, BRIDGED MONO MODE
  • 8Ω, 1 kHz 0.1% THD: 2800W
  • 4Ω 1 kHz 1% THD: 4000W
• Signal to Noise (20 Hz-20 kHz)100dB
• Distortion (SMPTE-IM)Less than 0.01%
• Input Sensitivity @ 8 ohms1.24V (+4.1 dBu)
• Maximum Voltage Gain64.0× (36.1 dB)
• Output CircuitryClass H, 3 tier
• THX ApprovedYes
• Weight - Net68 lb (30.8 kg)
• Weight - Shipping77 lb (34.4 kg)
• Distortion (Typical) 20 Hz–20 kHz: 10 dB below rated powerLess than 0.03% THD, 4 ohms and 8 ohms
• 1.0 kHz and below: full rated powerLess than 0.03% THD, 4 ohms and 8 ohms
• Frequency Response 10 dB below rated output powerISA 280, 450, 750 and 1350: 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; ISA 1350 greater than 250
• Output Regulation (isolated outputs)Less than 1.5 dB
• Input Impedance10 kΩ unbalanced, 20 kΩ balanced
• Input Clipping10 V rms (+22 dBu)
• CoolingContinuously 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) inches5.25 x 19 x 15.9 / 3RU
• Dimensions (HWD) mm133 x 483 x 400 / 3RU
• Amplifier Protection
  • Full short circuit, open circuit, thermal, ultrasonic, and RF protection;
  • Stable into reactive or mismatched loads
• Power Requirements120 or 230 VAC, 50–60 Hz
• Load ProtectionOn/off muting; Triac crowbar: ISA 750, 1350, and 800Ti; AC coupling: ISA 280, 300Ti, 450, and 500Ti