ISA Series, Ti Models | QSC Audio ISA300Ti, ISA450, ISA750 instruction

ISA Series

Professional Power Amplifiers

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**	4Ω**	2Ω†
ISA280	–	185	280	430

ISA450	–	260	425	700

ISA750	–	450	650	1200

ISA1350	1500††	800	1300	2000
ISA300Ti	300	185	280	430

ISA500Ti	500	260	425	700

ISA800Ti	800	450	650	1200

*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

THX is a trademark of THX Ltd.

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

•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

“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

ISA1350, ISA280, ISA750, ISA800Ti, ISA500Ti specifications

QSC Audio, a reputable name in the professional audio industry, offers a diverse range of power amplifiers tailored for various applications. Among their most prominent products are the ISA450, ISA500Ti, ISA750, ISA280, and ISA1350 amplifiers. Each model features cutting-edge technologies and characteristics designed to deliver exceptional sound quality and reliability.

The ISA450 is a compact, lightweight power amplifier that stands out for its efficiency and flexibility. With a power output of 450 watts per channel at 4 ohms, it provides ample power for a variety of applications, including commercial spaces and live events. The ISA450 features an advanced cooling system, ensuring optimal performance even under heavy loads. Additionally, its versatility means it can be used in both 70V and 4 ohm configurations, making it suitable for a wide range of speaker systems.

Next in line is the ISA500Ti, known for its powerful performance and innovative technologies. It boasts a power output of 500 watts per channel, making it ideal for installations requiring robust audio playback. The ISA500Ti is equipped with DSP capabilities, enabling users to customize audio settings such as EQ, crossover, and delay adjustments. Furthermore, its efficient Class D amplification helps reduce power consumption while maintaining high audio fidelity.

The ISA750 amplifier offers even more robust capabilities, delivering 750 watts per channel at 4 ohms. Designed for larger venues, the ISA750 employs QSC’s renowned PowerWave technology to ensure consistent performance and thermal efficiency. This amplifier also features advanced protection circuitry, safeguarding against overload and short circuits, which helps enhance the system's longevity.

The ISA280 is engineered for compact installations where space is at a premium. Despite its smaller footprint, it provides a solid output of 280 watts per channel at 4 ohms. This model is perfect for background music or speech reinforcement in restaurants, stores, and corporate environments. The ISA280 includes features such as signal sensing power on/off, which streamlines installation and operation by eliminating the need for manual switching.

Lastly, the ISA1350 amplifier excels in spreading power across larger areas with up to 1350 watts per channel. It is particularly suitable for large auditoriums, stadiums, or outdoor events where high sound pressure levels are necessary. Like its counterparts, the ISA1350 employs advanced circuitry to optimize performance and reliability.

Overall, QSC's ISA series amplifiers, including the ISA450, ISA500Ti, ISA750, ISA280, and ISA1350, embody a perfect blend of power, efficiency, and versatility, catering to the demanding needs of professionals in the audio industry. Each model stands out for its unique features, making them suitable for a diverse range of applications. From small retail settings to expansive concert venues, QSC's ISA series continues to set the standard in professional audio solutions.