QSC Audio ISA300Ti, ISA1350, ISA280, ISA450, ISA750 User Manual
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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.
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.
†
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
• 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
™ approved for professional cinema applications
“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
ISA Series
ISA280 ISA450 ISA750 ISA1350 ISA300Ti ISA500Ti ISA800Ti
Stereo Mode (both channels driven) Continuous average output power per channel
8Ω / 20 Hz - 20 kHz / 0.1% THD 185 W 260 W 450 W 800 W 185 W 260 W 450 W
4Ω / 20 Hz - 20 kHz / 0.1% THD 280 W 425 W 650 W 1300 W 280 W 425 W 650 W
2Ω / 1 kHz / 1% THD 430 W 700 W 1200 W 2000 W 430 W 700 W 1200 W
Direct Ouput, Stereo Mode
70V / 20 Hz - 20 kHz / +0,-0.3 dB / 0.5% THD − − − 1500 W − − −
XF Output Power, Stereo Mode
70V or 100V / 50 Hz - 16 kHz / 0.5% THD
25V / 50 Hz - 16 kHz / 0.5% THD − − − − 200 W 300 W 500 W
Bridge Mono Mode Continuous average output power
8Ω / 1 kHz / 0.1% THD 600 W 900 W 1500 W 2800 W 600 W 900 W 1500 W
4Ω / 1 kHz / 1% THD 830 W 1400 W 2400 W 4000 W 830 W 1400 W 2400 W
XF Output Power, Bridge Mono Mode
140V or 200V / 50Hz - 16 kHz / 0.5% THD − − − − 600 W 1000 W 1600 W
Signal to Noise (20 Hz - 20 kHz) 100 dB 100 dB 100 dB 100 dB 100 dB 100 dB 100 dB
Distortion (SMPTE-IM) < 0.01% < 0.01% < 0.02% < 0.01% < 0.01% < 0.01% < 0.02%
Input Sensitivity at 8Ω 1.15V (+3.4 dBU) 1.07V (+2.8 dBU) 1.07V (+2.8 dBU) 1.24V (+4.1 dBU) 1.15V (+3.4 dBU) 1.07V (+2.8 dBU) 1.07V (+2.8 dBU)
Gain at 8Ω 33.4x (30.5 dB) 44.7x (33 dB) 56.2x (35 dB) 64.0x (36.1 dB) 33.4x (30.5 dB) 44.7x (33 dB) 56.2x (35 dB)
Output Circuitry AB AB Class H, 2-tier Class H, 3-tier AB AB Class H, 2-tier
Distortion (typical)
20 Hz - 20 kHz: 10 dB below rated power < 0.03% THD / 4Ω and 8Ω
1.0 kHz and below: full rated power < 0.03% THD / 4Ω and 8Ω
Frequency Response (10 dB below rated ouput power) ISA280, ISA450, ISA750 and ISA1350: 20 Hz-20 kHz, +0/-1 dB | -3 dB points, 5 Hz and 50 kHz
ISA300Ti, ISA500Ti, ISA800Ti Direct outputs: -3 dB at 50 Hz, -0.5 dB at 20 kHz XF outputs: 50 Hz - 16 kHz, +0/-3 dB
Damping Factor (direct outputs) > 200 at 8Ω / ISA1350: > 250
Output Regulation (isolated outputs) < 1.5 dB
Input Impedance 10k ohms unbalanced, 20k ohms balanced
Input Clipping 10 Vrms (+22 dBu) / ISA1350: 4.53 Vrms (+15.3 dBu)
Cooling Continuously variable speed fan, back-to-front air flow
Connectors Input: Active balanced, 3-pin euro style detachable terminal block and XLR (pin 2+)
Output: Covered barrier strips, DataPort V2 / HD-15 connector
Controls Front: AC switch
Rear: Ch. 1 & 2 gain knobs / 10-position DIP switch
Indicators Power-On: Green LED | Signal: Green LED (1 per channel) | Protect: Red LED (ISA 1350) | Clip: Red LED (1 per channel)
Amplifier Protection Full short circuit, open circuit, thermal, ultrasonic, and RF protection. Stable into reactive or mismatched loads
Load Protection On/off muting
Triac crowbar: ISA750, ISA1350 and ISA800Ti
AC coupling: ISA280, ISA300Ti, ISA450, ISA500Ti
Dimensions (HWD) 5.25
Weight
Net 36 lbs (16.3 kg) 42 lbs (19 kg) 47 lbs (21.3 kg) 68 lbs (30.8 kg) 44 lbs (20.0 kg) 49 lbs (22.3 kg) 57 lbs (26 kg)
Shipping 42 lbs (19.1 kg) 48 lbs (22 kg) 53 lbs (24.0 kg) 77 lbs (34.4 kg) 50 lbs (22.7 kg) 55 lbs (25 kg) 63 lbs (28.6 kg)
Power Requirements 100, 120, 230 VAC, 50 - 60 Hz
− − − − 300 W 500 W 800 W
" (13.3 cm) 3 rack spaces x 19" (48.3 cm) rack mounting x 15.9" (40 cm) deep from front mounting rails
Specifications
Specifications subject to change without notice.
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174
ISA Series Spec Sheet - 02/22/06
qscaudio.com
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