SPECIFICATIONS ISA 280 ISA 450 ISA 750
AMPLIFIER PROTECTION Full short circuit, open circuit, thermal, ultrasonic and RF protection.
Stable into reactive or mismatched loads.
COOLING Continuously variable speed fan; back-to-front air flow.
INDICATORS Front Panel: POWER LED (green), 2 each SIGNAL (green) and CLIP (red) LEDs
CONNECTORS Input: (2)XLR, (2)terminal block (“euro” or “Phoenix”) and (1)QSC DataPort V2 connector
Output: screw-terminal barrier strip direct low impedance outputs
LOAD PROTECTION Turn-on/turn-off muting Turn-on/turn-off muting Turn-on/turn-off muting
AC coupling AC coupling Clip limiting
Clip limiting Clip limiting Triac Crowbar
OUTPUT CIRCUIT TYPE AB AB Class-H
POWER REQUIREMENTS SEE SERIAL NUMBER LABEL ON REAR PANEL FOR THE SPECIFIED OPERATING VOLTAGE
POWER CONSUMPTION

@ 120 VAC, typical

(both channels driven)

Idle 0.3 0.4 0.5
1/8 power, 8 ohms* 2.6 3.5 4.5
1/8 power, 4 ohms* 4.1 5.9 7.0
1/8 power, 2 ohms* 6.2 9.1 10.3

NOTE: 1/8 power is representative of current draw with typical music program material with occasional clipping. *Pink noise

CONTROLS (all models) Front: AC POWER switch
Back: Gain controls, DIP switch block with 10 poles: Clip Limiters, Stereo/Parallel/Bridge mode
selection, low frequency filter on-off and frequency selection
DIMENSIONS (all models) 19.00" (48.3 cm) wide, 5.20" (13.2 cm) tall (3 rack spaces)
15.75" (40.0 cm) deep (from front mounting rails) including rear support ears
WEIGHT 36 pounds (16.3 kg.) 36 pounds (16.3 kg.) 47 pounds (21.3 kg.)

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

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