ISA280
ISA450
ISA750
ISA1350
ISA300Ti
ISA500Ti
ISA800Ti
Stereo Mode (both channels driven)
Continuous average output power per channel
8
Ω
/ 20 Hz – 20 kHz / 0.1% THD
185 W
260 W
450 W
800 W
185 W
260 W
450 W
4
Ω
/ 20 Hz – 20 kHz / 0.1% THD
280 W
425 W
650 W
1300 W
280 W
425 W
650 W
2
Ω
/ 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
−
−
−
−
300 W
500 W
800 W
25V / 50 Hz – 16 kHz / 0.5% THD
−
−
−
−
200 W
300 W
500 W
Bridge-Mono Mode
Continuous average output power
8
Ω
/ 1 kHz / 0.1% THD
600 W
900 W
1500 W
2800 W
600 W
900 W
1500 W
4
Ω
/ 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 8
Ω
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 8
Ω
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
Class AB
Class AB
2-tier Class H
3-tier Class H
Class AB
Class AB
2-tier Class H
Distortion (typical)
20 Hz – 20 kHz: 10 dB below rated power
< 0.03% THD / 4
Ω
and 8
Ω
1.0 kHz and below: full rated power
< 0.03% THD / 4
Ω
and 8
Ω
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 8
Ω
/ 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
"
(13.3 cm) 3 RU x 19
"
(48.3 cm) rack mounting x 15.9
"
(40 cm) deep from front mounting rails
Weight
Net
36 lb (16.3 kg)
42 lb (19 kg)
47 lb (21.3 kg)
68 lb (30.8 kg)
44 lb (20.0 kg)
49 lb (22.3 kg)
57 lb (26 kg)
Shipping
42 lb (19.1 kg)
48 lb (22 kg)
53 lb (24.0 kg)
77 lb (34.4 kg)
50 lb (22.7 kg)
55 lb (25 kg)
63 lb (28.6 kg)
Power Requirements
100, 120, 230 VAC, 50 – 60 Hz
ISA Series
Specifications
qscaudio.com
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 - 06/05/08
QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark office and other countries. THX is a trademark of THX Ltd.
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