QSC Audio Stereo Amplifier IT 42 User Guide

IT-42 Installation Guide  
INTRODUCTION  
The IT-42 is an output isolation transformer accessory for the QSC CX 302 amplifier, allowing it to drive two 25-, 70-, and 100-volt distributed lines in stereo or  
parallel, or a single 140- or 200-volt line in bridged mono. It mounts conveniently to the back of the amplifier and requires no additional rack space.  
In stereo or parallel modes, the two distributed lines may be loaded at up to 400 watts each. In bridged mono, the distributed line may be loaded at up to 800  
watts.  
Figure 1 shows the necessary mounting and configuration features of the IT-42  
6
3
4
5
1. Mounting tabs  
2. Transformer input wires with spade lug connectors  
3. Isolated output barrier strip  
4. Transformers  
1
2
5. Slotted mounting tabs (× 2)  
6. #8-32 × 5/16” Philips screw, black (× 2), included  
6
Figure 1  
INSTALLATION  
Although the IT-42 transformer accessory can be installed while the amplifier is already rack mounted, installation is much easier with the amplifier out of the rack  
and placed face-down so it rests on its front panel.  
CAUTION: Turn off the amplifier before installing the IT-42 accessory.  
1. Open the safety shroud over the amplifiers output barrier strip. Fully loosen—but do not remove—the two screw terminals at the top and the two at the bottom.  
2. Align the spade lug connectors on the transformer input wires with their respective screw terminals and slide them fully onto the screws. Tighten  
the screw terminals.  
Figure 2  
3. Insert the slotted mounting tabs on the right end of the IT-42 into the slots in the amplifier chassis (Figure 2).  
4. Align the holes in the mounting tabs on the left end of the IT-42 with the threaded holes in the amplifier chassis. Insert and tighten the  
mounting screws.  
Figure 3  
5. Press the right end of the bracket in to the left so that the slotted tabs lock to the amplifier and will not pull out (Figure 3).  
Rack mounting  
The IT-42 adds to the depth of the amplifier, so you  
must allow more space at the rear of the rack. See  
Figure 4. Because of the additional weight of the  
transformers, it is important to support the amp at the  
To front rack rail  
Vers le rail montage avant  
Zur Vorderrackstange  
Hacia la barandilla de  
montaje anterior  
CX 302 Amplifier • Amplificateur CX 302 • CX 302-Verstärker • Amplificador CX 302  
back, even in fixed installations. Rear rack ear kits for QSC  
amplifiers are available from QSCs technical services  
department or from your dealer or distributor.  
16.48"  
418.6 mm  
If you are using in the same rack two or more  
amplifiers with transformer accessories, separate  
them by at least one rack space to minimize crosstalk.  
Figure 4  
17.31"  
439.7 mm  
*TD-000081-00*  
TD-000081-00  
Preliminary  
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