QSC ISA280 2 Channels 185 Watts 8 Ohms ISA Series Rackmount Installation Stereo Power Amplifier

Commercial power amplifier

Key Features

• Rear panel gain controls for tamper resistance; 2-dB detents allow 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 (30 Hz or 70 Hz) protect speakers and prevent speaker transformer saturation with minimal effect on program material
• Front panel LED indicators include power, signal, and clip
• Covered barrier strip output connectors for safety agency compliance
• Automatic on-demand variable-speed fan: quiet normal operation, with maximum cooling when needed
• Rear-to-front air flow helps keep equipment racks cool
• Stereo, bridge, or parallel operating modes
• Comprehensive protection circuitry including DC, infrasonic, thermal overload, and short circuit protection

Technical Specifications

OUTPUT POWER PER CHANNEL, STEREO MODE, both channels driven
8Ω, 20 Hz-20 kHz 0.1% THD: 185W
4Ω, 20 Hz-20 kHz 0.1% THD: 280W
2Ω 1 kHz 1% THD: 430W
TRANSFORMER-ISOLATED OUTPUT POWER PER CHANNEL, STEREO MODE
OUTPUT POWER, BRIDGED MONO MODE
8Ω, 1 kHz 0.1% THD: 600W
4Ω 1 kHz 1% THD: 830W
Signal to Noise (20 Hz-20 kHz)
100 dB
Distortion (SMPTE-IM)
Less than 0.01%
Input Sensitivity @ 8 ohms
1.15 V (+3.4 dBu)
Maximum Voltage Gain
33.4× (30.5 dB)
Output Circuitry
Class AB
Weight - Net
36 lb (16.3 kg)
Weight - Shipping
42 lb (19.1 kg)
Distortion (Typical) 20 Hz-20 kHz: 10 dB below rated power
Less than 0.03% THD, 4 ohms and 8 ohms
1.0 kHz and below: full rated power
Less than 0.03% THD, 4 ohms and 8 ohms
Frequency Response
10 dB below rated output power
ISA 280, 450, 750 and 1350:
20 Hz-20 kHz, +0/-1 dB; -3 dB points: 5 Hz and 50 kHz
Damping Factor with 8Ω Load (direct outputs)
Greater than 200; ISA 1350 greater than 250
Output Regulation (isolated outputs)
Less than 1.5 dB
Input Impedance
10 kΩ unbalanced, 20 kΩ balanced
Input Clipping
10 V rms (+22 dBu)
Cooling
Continuously variable speed fan, back-to-front air flow
Connectors, each channel
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 and Ch. 2 gain knobs, 10-position DIP switch
Indicators
PWR-ON: Green LED; SIGNAL: Green LED (1 per channel);
CLIP: Red LED (1 per channel)
Dimensions (HWD) inches
5.25 x 19 x 15.9 / 3RU
Dimensions (HWD) mm
133 x 483 x 400 / 3RU
Amplifier Protection
Full short circuit, open circuit, thermal, ultrasonic, and RF protection;
Stable into reactive or mismatched loads
Power Requirements
120 or 230 VAC, 50-60 Hz
Load Protection
On/off muting; Triac crowbar: ISA 750, 1350, and 800Ti; AC coupling: ISA 280, 300Ti, 450, and 500Ti