QSC Audio Stereo Amplifier ISA1350 User Guide

ISA Series  
Professional Power Amplifiers  
ISA280 | ISA450 | ISA750 | ISA1350 | ISA300Ti | ISA500Ti | ISA800Ti  
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  
• 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)  
ISA Power Amplifiers  
• Class H complementary bipolar output circuitry reduces AC power draw and waste  
heat by 40% on ISA750 and ISA800Ti, and by 50% on ISA1350  
Watts per channel  
Model  
70V*  
8Ω**  
4Ω**  
280  
425  
650  
1300  
280  
425  
650  
2†  
430  
• Front panel indicators include power, signal, and clip (and protect on ISA1350)  
• Covered barrier strip output connectors for safety agency compliance  
ISA280  
ISA450  
ISA750  
ISA1350  
ISA300Ti  
ISA500Ti  
ISA800Ti  
185  
260  
450  
800  
185  
700  
• Automatic variable-speed fan for quiet normal operation with maximum cooling  
on demand  
1200  
2000  
430  
1500††  
300  
500  
800  
• Rear-to-front air flow keeps equipment racks cool  
• Stereo, bridge, or parallel operating modes  
260  
450  
700  
• Comprehensive protection circuitry including DC, infrasonic, thermal overload, and  
short circuit protection  
1200  
• 3 year warranty plus optional 3 year extended service contract  
* 50 Hz – 16 kHz, 0.5% THD  
** 20 Hz – 20 kHz, 0.1% THD  
†1 kHz, 1% THD  
“Ti” Models  
• 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  
†† Direct Output, 70V, less than 0.5% THD, 20 - 20 kHz  
THX is a trademark of THX Ltd.  
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