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QSC ISA280 User Manual

QSC ISA280
142 pages
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Technical Service Manual
ISA™ Series
ISA280
ISA300T
ISA300Ti
ISA450
ISA500T
ISA500Ti
ISA750
ISA800T
ISA800Ti
ISA1350
*TD-000163-00*
TD-000163-00
Rev. B
QSC Audio Products, LLC
Costa Mesa, CA 92626 USA
www.qscaudio.com
RoHS

Table of Contents

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QSC ISA280 Specifications

ISA280

Power Output IconPower Output
output power at 8Ω (stereo mode)185 W
output power at 4Ω (stereo mode)280 W
output power at 2Ω (stereo mode)430 W
output power at 8Ω (bridge-mono mode)600 W
output power at 4Ω (bridge-mono mode)830 W
Audio Specifications IconAudio Specifications
signal to noise ratio100 dB
distortion (SMPTE-IM)< 0.01%
input sensitivity at 8Ω1.15V (+3.4 dBU)
gain at 8Ω33.4x (30.5 dB)
damping factor> 200 at 8Ω
Physical Characteristics IconPhysical Characteristics
dimensions (HWD)5.25" (13.3 cm) 3 RU x 19" (48.3 cm) x 15.9" (40 cm)
net weight36 lb (16.3 kg)
shipping weight42 lb (19.1 kg)

ISA450

Power Output IconPower Output
output power at 8Ω (stereo mode)260 W
output power at 4Ω (stereo mode)425 W
output power at 2Ω (stereo mode)700 W
output power at 8Ω (bridge-mono mode)900 W
output power at 4Ω (bridge-mono mode)1400 W
Audio Specifications IconAudio Specifications
signal to noise ratio100 dB
distortion (SMPTE-IM)< 0.01%
input sensitivity at 8Ω1.07V (+2.8 dBU)
gain at 8Ω44.7x (33 dB)
damping factor> 200 at 8Ω
Physical Characteristics IconPhysical Characteristics
dimensions (HWD)5.25" (13.3 cm) 3 RU x 19" (48.3 cm) x 15.9" (40 cm)
net weight42 lb (19 kg)
shipping weight48 lb (22 kg)

ISA750

Power Output IconPower Output
output power at 8Ω (stereo mode)450 W
output power at 4Ω (stereo mode)650 W
output power at 2Ω (stereo mode)1200 W
output power at 8Ω (bridge-mono mode)1500 W
output power at 4Ω (bridge-mono mode)2400 W
Audio Specifications IconAudio Specifications
signal to noise ratio100 dB
distortion (SMPTE-IM)< 0.02%
input sensitivity at 8Ω1.07V (+2.8 dBU)
gain at 8Ω56.2x (35 dB)
damping factor> 200 at 8Ω
Physical Characteristics IconPhysical Characteristics
dimensions (HWD)5.25" (13.3 cm) 3 RU x 19" (48.3 cm) x 15.9" (40 cm)
net weight47 lb (21.3 kg)
shipping weight53 lb (24.0 kg)

ISA1350

Power Output IconPower Output
output power at 8Ω (stereo mode)800 W
output power at 4Ω (stereo mode)1300 W
output power at 2Ω (stereo mode)2000 W
output power at 8Ω (bridge-mono mode)2800 W
output power at 4Ω (bridge-mono mode)4000 W
Audio Specifications IconAudio Specifications
signal to noise ratio100 dB
distortion (SMPTE-IM)< 0.01%
input sensitivity at 8Ω1.24V (+4.1 dBU)
gain at 8Ω64.0x (36.1 dB)
damping factor> 250 at 8Ω
Physical Characteristics IconPhysical Characteristics
dimensions (HWD)5.25" (13.3 cm) 3 RU x 19" (48.3 cm) x 15.9" (40 cm)
net weight68 lb (30.8 kg)
shipping weight77 lb (34.4 kg)

ISA300Ti

Power Output IconPower Output
output power at 8Ω (stereo mode)185 W
output power at 4Ω (stereo mode)280 W
output power at 2Ω (stereo mode)430 W
output power at 8Ω (bridge-mono mode)600 W
output power at 4Ω (bridge-mono mode)830 W
Audio Specifications IconAudio Specifications
signal to noise ratio100 dB
distortion (SMPTE-IM)< 0.01%
input sensitivity at 8Ω1.15V (+3.4 dBU)
gain at 8Ω33.4x (30.5 dB)
damping factor> 200 at 8Ω
Physical Characteristics IconPhysical Characteristics
dimensions (HWD)5.25" (13.3 cm) 3 RU x 19" (48.3 cm) x 15.9" (40 cm)
net weight44 lb (20.0 kg)
shipping weight50 lb (22.7 kg)

ISA500Ti

Power Output IconPower Output
output power at 8Ω (stereo mode)260 W
output power at 4Ω (stereo mode)425 W
output power at 2Ω (stereo mode)700 W
output power at 8Ω (bridge-mono mode)900 W
output power at 4Ω (bridge-mono mode)1400 W
Audio Specifications IconAudio Specifications
signal to noise ratio100 dB
distortion (SMPTE-IM)< 0.01%
input sensitivity at 8Ω1.07V (+2.8 dBU)
gain at 8Ω44.7x (33 dB)
damping factor> 200 at 8Ω
Physical Characteristics IconPhysical Characteristics
dimensions (HWD)5.25" (13.3 cm) 3 RU x 19" (48.3 cm) x 15.9" (40 cm)
net weight49 lb (22.3 kg)
shipping weight55 lb (25 kg)

ISA800Ti

Power Output IconPower Output
output power at 8Ω (stereo mode)450 W
output power at 4Ω (stereo mode)650 W
output power at 2Ω (stereo mode)1200 W
output power at 8Ω (bridge-mono mode)1500 W
output power at 4Ω (bridge-mono mode)2400 W
Audio Specifications IconAudio Specifications
signal to noise ratio100 dB
distortion (SMPTE-IM)< 0.02%
input sensitivity at 8Ω1.07V (+2.8 dBU)
gain at 8Ω56.2x (35 dB)
damping factor> 200 at 8Ω
Physical Characteristics IconPhysical Characteristics
dimensions (HWD)5.25" (13.3 cm) 3 RU x 19" (48.3 cm) x 15.9" (40 cm)
net weight57 lb (26 kg)
shipping weight63 lb (28.6 kg)

Summary

ISA Series Performance Specifications

Introduction

1.6 Technical descriptions and theory of operation

Explains internal workings like power supplies, audio circuitry, clip detection, DC protection, Class H, and bridged mono.

Troubleshooting: Symptoms, causes, & remedies

3.1 Excessive current draw

Addresses symptoms of excessive current draw, including blown fuses and overheating.

3.2 Protection, muting, and turn-on/turn-off delay problems

Troubleshoots issues related to amplifier protection, muting, and turn-on/off delays.

3.3 Faults with signal present

Diagnoses problems that occur when the amplifier passes a signal but performs incorrectly.

3.4 Instability

Identifies and resolves issues related to general distortion, ringing, and crossover distortion.

3.5 Power supply & rail balancing problems

Troubleshoots uneven rail voltages and current limiting issues with power supplies.

ISA calibration procedures

4.1 Setting bias

Step-by-step guide to setting amplifier bias for optimal performance and preventing distortion.

4.2 Setting positive and negative current limits

Procedure for adjusting current limit thresholds to protect the amplifier during operation.

Servicing ISA amplifiers

5.1 Mechanical disassembly and re-assembly

Instructions for safely disassembling and reassembling amplifier chassis and modules.

Replacement parts

6.1 ISA280 parts and assemblies

Lists replacement parts and assemblies for the ISA280 amplifier model.

6.2 ISA300T parts and assemblies

Lists replacement parts and assemblies for the ISA300T amplifier model.

6.3 ISA300Ti parts and assemblies

Lists replacement parts and assemblies for the ISA300Ti amplifier model.

6.4 ISA450 parts and assemblies

Lists replacement parts and assemblies for the ISA450 amplifier model.

6.5 ISA500T parts and assemblies

Lists replacement parts and assemblies for the ISA500T amplifier model.

6.6 ISA500Ti parts and assemblies

Lists replacement parts and assemblies for the ISA500Ti amplifier model.

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