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QSC ISA280 Specifications

QSC ISA280
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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
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 Series
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
ProfessionalPowerAmplifiers
ISA280 | ISA450 | ISA750 | ISA1350 | ISA300Ti | ISA500Ti | ISA800Ti

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Technical & Service Manual142 pages

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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)
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