QSC ISA Series Amplifiers

The ISA Series features six models including three low impedance models (ISA 280, ISA 450, ISA 750) rated for 2-ohm operation, and three "T" versions with 25, 70 and 100 volt outputs for distributed audio systems (ISA 300T, ISA 500T, ISA 800T). Versatile loading options and a comprehensive feature set make the ISA Series a rugged, cost-effective power solution for any permanently installed sound system.

Housed in a rugged 3-U chassis, all six models feature rear panel gain controls for tamper resistant operation with 2 dB detents for quick and repeatable settings. Inputs include both XLR and detachable Euro-style connectors. Outputs feature covered barrier strip connectors for safety agency compliance, and for added versatility, a DataPort V2 (Version 2) terminated with an HD-15 connector is provided for use with DPV2-compatible signal processing accessories such as the XC-3 Crossover, SF-3 Subwoofer Filter, LF-3 Low Frequency Filter and the DSP-3 with external power supply.

Features

• Three models for low-impedance applications
• Three "T" versions include low-impedance and 25-, 70-, and 100-volt outputs for distributed audio systems
• 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 (with external power supply)
• Independent defeatable clip limiters for reduced distortion
• Selectable high-pass filters that protect speakers and prevent speaker transformer saturation with minimal effect on program material (30 Hz or 70 Hz on non-"T" models, 50 Hz or 75 Hz on "T" models)
• Class H complementary bipolar output circuitry reduces AC power draw and waste heat by 40% (ISA 750 and 800T)
• 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

"T" Models

• 25-, 70-, 100-volt, and low-impedance outputs available simultaneously
• Simple barrier strip connection determines output mode

QSC ISA Series Specifications (PDF 143KB)

Watts per channel

ISA280 – 185@8ohms, 280@4ohms, 430@2ohms

ISA450 – 260@8ohms, 425@4ohms, 700@2ohms

ISA750 – 450@8ohms, 650@4ohms, 1200@2ohms

ISA1350 - 1500@70V, 800@ 8ohms, 1300@4ohms, 2000@2ohms

ISA300Ti - 300@70V, 185@8ohms, 280@4ohms, 430@2ohms

ISA500Ti - 500@70V, 260@8ohms, 425@4ohms, 700@2ohms

ISA800Ti - 800@70V, 450@8ohms, 650@4ohms, 1200@2ohms