QSC ISA280, ISA750, ISA450, ISA300Ti, ISA1350 User Manual
The ISA Installed System Amplifiers are designed
to meet the needs of sound system designers and
contractors worldwide. Three models feature iso-
lated 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
70V 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.
280
•
185 280 430
450
•
260 425 700
750
•
450 650 1200
1350
1500
††
800 1300 2000
300Ti
300 185 280 430
500Ti
500 260 425 700
800Ti
800 450 650 1200
70
V
*
8
Ω
**
4
Ω
**
2
Ω
†
Watts per channelModel
* 50 Hz–16 kHz, 0.5% THD ** 20 Hz–20 kHz, 0.1% THD † 1 kHz, 1% THD
†† Direct Output, 70V, less than 0.1% THD, 20-20kHz, +0/-0.3dB
ISA
ISA Features
•
Four models for low-impedance applications
•
ISA 1350 drives 70V lines directly with 1500 watts / channel
•
Three “Ti”versions include low-impedance and isolated 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/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 ISA 750 and 800Ti, and by 50% on ISA 1350
•
Front panel indicators include power, signal,and clip (and protect on ISA 1350)
•
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
PROFESSIONAL POWER AMPLIFIERS
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174
www.qscaudio.com • email: info@qscaudio.com
300Ti
ISA SPECIFICATIONS
8 ohms 20 Hz-20 kHz 0.1% THD
4 ohms 20 Hz-20 kHz 0.1% THD
2 ohms 1 kHz 1% THD
XF Output Power, Stereo Mode
25V 50 Hz-16 kHz 0.5% THD
XF Output Power, Bridge Mono Mode
Distortion (typical)
Frequency Response
Damping Factor (direct outputs)
Signal to Noise (20Hz-20kHz)
Input Sensitivity @ 8 ohms
Gain at 8 ohms
Output Circuitry
Input Impedance
Input Clipping
Cooling
Connectors
Amplifier Protection
Load Protection
Weight
20 Hz-20 kHz: 10 dB below rated power
1.0 kHz and below: full rated power
500W
700W1200W
425W650W
260W
450W
450W
650W
1200W
–
300W
450 500Ti
Stereo Mode (both channels driven)
Bridge Mono Mode
4 ohms 1 kHz 1% THD
8 ohms 1 kHz 0.1% THD 900W1500W
1400W2400W
1500W
2400W
Less than 0.03% THD, 4Ω & 8Ω
Less than 0.03% THD, 4Ω & 8Ω
ISA 280, 450, 750 and 1350: 20 Hz–20 kHz, +0/-1 dB; -3 dB points: 5 Hz and 50 kHz
ISA 300Ti, 500Ti and 800Ti:
Direct outputs: -3 dB @ 50 Hz, -0.5 dB @ 20 kHz; XF outputs: 50 Hz–16 kHz, +0/-3 dB
Greater than 200 @ 8Ω,ISA 1350 greater than 250
Output Regulation (isolated outputs)
Less than 1.5 dB
10 kΩ unbalanced, 20 kΩ balanced
10 Vrms (+22 dBu), ISA 1350 4.53 Vrms (+15.3 dBu)
Continuously variable speed fan, back-to-front air flow
Full short circuit, open circuit, thermal, ultrasonic, and RF protection;
Stable into reactive or mismatched loads
On/off muting; Triac crowbar: ISA 750, 1350 and 800Ti; AC coupling: ISA 280, 300Ti, 450 and 500Ti
Dimensions 19” (48.3 cm) rack mounting, 5.25”(13.3cm) tall (3 rack spaces),
15.9” (40 cm) deep (from front mounting rails)
Power Requirements 120, 230, VAC, 50-60 Hz
36 lb (16.3 kg)
42 lb (19.1 kg)
42 lb (19 kg) 47 lb (21.3 kg) 44 lb (20.0 kg) 49 lb (22.3kg) 57 lb (26 kg)
Shipping
Net
48 lb (22 kg) 53 lb (24.0 kg) 50 lb (22.7 kg) 55 lb (25 kg) 63 lb (28.6 kg)
Input: Active balanced; 3-pin Euro-style detachable terminal block and XLR (pin 2+)
Output: Covered barrier strips
Controls
Front: AC switch
Rear: Ch. 1 and Ch. 2 gain knobs, 10-position DIP switch
Indicators
PWR-ON: Green LED SIGNAL: Green LED (1 per channel)
PROTECT: Red LED (ISA 1350) CLIP: Red LED (1 per channel)
DataPort V2: HD-15 connector
750 1350 800Ti
100 dB
100 dB
100 dB
1.07v (+2.8 dBu)
56.2x (35 dB)
Class H, 2 Tier
1.07v (+2.8 dBu)1.07v (+2.8 dBu)
44.7x (33 dB)
56.2x (35 dB)
Class AB
700W
425W
260W
–
900W
1400W
100 dB
1.07v (+2.8 dBu)
44.7x (33 dB)
Class AB
430W
280W
185W
200W
600W
830W
100 dB
1.15v (+3.4 dBu)
33.4x (30.5 dB)
Class AB
430W
280W
185W
140V or 200V 50 Hz-16 kHz 0.5% THD
1600W1000W
––
600W
–
–
70V or 100V 50 Hz-16 kHz 0.5% THD
Direct Output,Stereo Mode
70V 20 Hz-20 kHz +0/-0.3dB 0.5% THD
800W
–
–
–
500W
–
300W
–
–
–
–
–
–
–
600W
830W
100 dB
Distortion (SMPTE-IM)
Less than 0.01%
Less than 0.02%
Less than 0.02%
Less than 0.01% Less than 0.01%
68 lb (30.8 kg)
77 lb (34.4 kg)
2000W
1500W
1300W
800W
2800W
4000W
100 dB
1.24v (+4.1 dBu)
64.0x (36.1 dB)
Class H, 3 Tier
–
Less than 0.01%
Less than 0.01%
1.15v (+3.4 dBu)
33.4x (30.5 dB)
Class AB Class H, 2 Tier
280
All models All models
Continuous Average Output Power
Continuous Average Output Power Per Channel
10 dB below rated output power
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 •
www.qscaudio.com
ISA Spec Sheet 02/25/04
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