QSC ISA280 Specifications

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.
ISA Power Amplifiers
Watts per channel
Model 70V* 8Ω**
ISA280 – 185
ISA450 – 260
ISA750 – 450
††
ISA1350 1500 800
ISA300Ti 300 185
ISA500Ti 500 260
ISA800Ti 800 450
* 50 Hz – 16 kHz, 0.5% THD
** 20 Hz – 20 kHz, 0.1% THD
†1 kHz, 1% THD
†† Direct Output, 70V, less than 0.5% THD, 20 – 20 kHz
ISA280 | ISA450 | ISA750 | ISA1350 | ISA300Ti | ISA500Ti | ISA800Ti
Features
• Four models for low-impedance applications
• ISA1350 drives 70 volt lines directly with 1500 watts per channel
• Three "Ti" versions include low-impedance and isolated 25, 70, and 100 volt
outputs for distributed audio systems
• ISA450 and ISA750: THX™ approved for professional cinema applications
• 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 on non-"Ti"
models, 50 Hz or 75 Hz on "Ti" models)
• Class H complementary bipolar output circuitry reduces AC power draw and waste
heat by 40% on ISA750 and ISA800Ti, and by 50% on ISA1350
• Front panel indicators include power, signal, and clip (and protect on ISA1350)
• Covered barrier strip output connectors for safety agency compliance
†
4Ω** 2Ω
• Automatic variable-speed fan for quiet normal operation with maximum cooling
280 430
on demand
425 700
• Rear-to-front air flow keeps equipment racks cool
650 1200
• Stereo, bridge, or parallel operating modes
1300 2000
• Comprehensive protection circuitry including DC, infrasonic, thermal overload, and
280 430 short circuit protection
• 3-year warranty plus optional 3-year extended service contract
425 700
"Ti" Models
650 1200
• Isolated 25, 70, 100 volt, and low-impedance outputs available simultaneously
• Simple barrier strip connection determines output mode
• "Ti" models have fully isolated 25, 70, and 100 volt outputs
ISA Series
Professional Power Amplifiers