Specifications
24
Ch. 1 + out
Ch. 2 + out
Ch. 1 - out
Ch. 2 - out
COM
COM
70V
70V
100V
100V
IT-42 schematic
CX amplifier
CX amplifier
CX amplifier
CX amplifier
XC-3
2-way
crossover
XC-3
2-way
crossover
SF-3
subwoofer
filter
LF-3
low-frequency
filter
Ch. 1
Ch. 1
Ch. 1
Ch. 1
Ch. 2
Ch. 2
Ch. 2
Ch. 2
MF
LF
MF
HF
LF
HF
L
R
full-range audio
full-range audio
CX amplifier
XC-3
2-way crossover
Ch. 1
Ch. 2
LF
HF
full-range audio
A stereo 3-way +
subwoofer system,
using four CX amps
A mono 2-way system
using one CX amp
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The XC-3 2-way crossover accessory. The LF-3 low frequency
filter and SF-3 subwoofer filter accessories are similar.
Accessories
IT-42 isolation transformer pack
For applications requiring isolated 25-, 70-, or 100-volt outputs, the IT-42 (pictured at right), a unique
transformer “backpack” accessory, allows the CX 302 to deliver up to 400 watts per channel or zone
(300 watts on 25-volt lines). In bridged mono mode, it can be used to drive a single 140- or 200-
volt line loaded at up to 800 watts. The IT-42 mounts to the back of the amplifier, but it doesn’t
interfere with cooling airflow or inhibit access to input and output connectors or to the amp’s
configuration switches.
The IT-42 is available from your QSC CX dealer or distributor or from QSC’s Technical Services
department (phone: 1-800-QSC AUDIO
(toll-free in USA only)
or 1+ (714) 957-7150; e-mail:
support@qscaudio.com).
For highest value and sound quality in music-oriented systems that don’t require isolation, the
transformerless “V” models are recommended for driving 70V lines.
Crossover and filter modules
Other accessories for the CX amplifiers include crossover and filter modules that mount
directly to the rear panel of the amplifier, needing no additional rack space or external power.
These accessories include the XC-3, a 2-way crossover; the SF-3 Subwoofer Filter; and the
LF-3 Low-Frequency filter. You can use these accessories in various combinations with your
amplifiers to create 2-way, 3-way, and 4-way (3-way plus subwoofer) active systems. The XC-
3 also features high-frequency boost and CD horn equalization.