QSC Audio ISA 450 User Manual

2 dB at 4 ohms

SMPTE-IM Less than 0.01%

-100 dB (unweighted, 20 Hz.-20 kHz.) 

+22 dBu, 10 Vrms (ISA 1350: +15.3 dBu, 4.53 Vrms)

INPUT IMPEDANCE 

10k ohms unbalanced, 20k ohms balanced

Short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads.

Turn-on/turnoff muting, AC coupling (DC fault blocking), Clip limiting.

Continuously variable speed fan; back-to-front air flow through heat sink tunnel

POWER (green), SIGNAL (green, 1 per channel) and CLIP (red, 1 per channel) 
ISA 1350: also equipped with Protect LED (red)

Input: (2) 3-pin terminal block and (2) XLR 
Output: screw terminal barrier strip
Control & Monitoring: (1) QSC DataPort V2

POWER REQUIREMENTS 

Refer to voltage specified on rear panel serial number label. Configured at factory for 100, 120 or 230 
VAC, 50- 60 Hz.

Front: AC POWER switch 
Back: gain controls, 10-position DIP switch block (Clip Limiters, Stereo/Parallel/Bridge mode selection,
Low frequency filter on/off (low impedance models only), Low frequency filter selection of 30/70 Hertz
(low impedance models) or 50/75 Hertz (Ti models), and AC circuit breaker (2 breakers on ISA 1350).

19.0" (48.3 cm) wide, 5.2" (13.2 cm) tall (3 rack spaces) 15.90" (40.4 cm) deep