Qsc Stereo Amplifier Isa1350 Users Manual

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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

THX is a trademark of THX Ltd.

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 − − − − 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

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" (13.3 cm) 3 rack spaces x 19" (48.3 cm) rack mounting x 15.9" (40 cm) deep from front mounting rails

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

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 - 02/22/06