QSC XC-3 Brochure
PERFORMANCE ACCESSORIES
1675 MacArthur Boulevard
Costa Mesa, CA 92626
Ph: 800/854-4079 or 714/957-7100
Fax: 714/754-6174
www.qscaudio.com
XC-3
Two-Way Crossover
Basic Description
The XC-3 is an active two-way crossover for use with bi-amplified loudspeakers. The unit mounts to the rear panel of a two-channel DCA or CX
amplifiers to save cost and rack space. The amplifier’s DataPort provides
the accessory’s operating power and receives the crossover output signals,
eliminating added external wiring or power transformers.
The XC-3 features 4
th
-order Linkwitz-Riley filters with 24 dB/octave
slopes, with the low frequencies going to channel 1 and the highs to
channel 2 of the amplifier. Each channel has an all-pass filter providing
delay for time alignment of low-frequency and high-frequency drivers,
as well as a trim control providing 0 to 20 dB of attenuation for
matching levels among the various frequency bands. To compensate
for screen loss or equalize for constant-directivity horns, the highfrequency channel offers up to 10 dB of boost at 20 kHz. Frequency and
delay parameters for each channel are set individually.
The XC-3 also has an elective low-frequency high-pass filter for use in
combination with the LF-3 Low-frequency filter for three-way applications.
Compatible Amplifier Models
DCA 1222, DCA 1622, DCA 2422, DCA 3022, and DCA 3422
CX 302, CX 502, CX 702, CX 902, CX 1102, CX 302V, CX 602V, and CX 1202V
LF-3 Features
• For 2-channel DCA series or CX series amps
• Designed for bi-amp cinema or installed sound systems
•
Adds crossover and time alignment functions without requiring
additional rack space, cabling, or AC outlets
•
Selectable crossover frequencies from 80 Hz to 1.5 kHz
•
Defeatable high-pass filter for tri-amp applications, with selectable
frequencies from 80 to 500 Hz
•
Selectable low-frequency time-alignment delays from 0.3 to 1.8 milliseconds
•
Mounts directly to back of amplifier; interfaces with amplifier
via DataPort
•
Precision components for accurate performance
•
Active balanced XLR inputs
XC-3 Spec Sheet.11/7/00
1
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OFF ON
1
Bi-amp Configuration
Ch. 1
full-range audio
2-way crossover
XC-3
LF
HF
Ch. 2
Tri-amp Configuration Using LF-3
Ch. 1
full-range audio
XC-3
2-way crossover
MF
HF
Ch. 2
L
Ch. 1
LF
LF-3
LF
low-frequency filter
Ch. 2
R
Ch. 1
MF
XC-3
full-range audio
2-way crossover
HF
Ch. 2
CX or DCA amplifier
CX or DCA amplifier
CX or DCA amplifier
CX or DCA amplifier
QSC Audio Inc. 1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174 • www.qscaudio.com
XC-3 SPECIFICATIONS
GENERAL INFORMATION
Crossover frequency
Optional high-pass filter
(for 3-way operation)
Output to amplifier
Accessory’s operating power
GENERAL AUDIO
Input stage type
Male HD-15 connector to amplifier DataPort
Male HD-15 connector to amplifier DataPort
Electronically balanced differential
Output stage type Balanced
Dynamic range 118 dB nominal
Total harmonic distortion Less than 0.1%
Signal to noise ratio Min. 103 dB
Crossover and high-pass filter type 4th-order Linkwitz-Riley alignment; -6 dB at crossover frequency
Filter roll-off slope 24 dB/octave rolloff
XC
-3
Supply Voltage (no load)
+15 volts provided by amplifier, -15 volts provided by internal charge-pump converter.
Supply Current Requirements
Less than 50 mA
Operating Temperature
0–70oC
Input type
Electronically balanced differential
Input impedance
22.6 kΩ balanced; 11.3 kΩ unbalanced
CONTROLS (each channel)
Selectable using SIP resistor networks: 80, 150, 200,250, 300, 350, 400, 500, 600, 650,800, 1000, 1200 or 1500 Hz
Bypass or engage using DIP switch
High-pass frequency
Selectable using SIP resistor networks: 80, 150, 200,250, 300, 350, 400 & 500 Hz
LF time alignment (all-pass) delay
Selectable using SIP resistor networks: 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 1.0, 1.2, 1.3, 1.4 & 1.8 milliseconds
Low frequency delay
Bypass or engage using DIP switch
HF gain adjustment
HF boost
Trim potentiometer 0–20 dB attenuation
Bypass or select using DIP switch 0, +2.5, +7.5, or 10 dB at 20 kHz, Maximum slope 6 dB/octave
CONNECTORS
Input
Output to LF-3
Female 3-pin XLR
Male 3-pin XLR
5.1
Cinema
Processor
L
C
R
LS
RS
Sub
XC-3XC-3XC-3
1
2
1
2
1
2
1
2
DCA
DCA
DCA
DCA
Left
MF
Left
HF
Center
MF
Center
HF
Right
MF
Right
HF
Left
Surround
Right
Surround
LF-3LF-3SF-3
1
2
1
2
1
2
DCA
DCA
DCA
Left
LF
Center
LF
Right
LF
Spare
Sub
Sub
Full-range
audio in
Out to
LF-3*
LF filtering
HF filtering
*In three-way system, with LF-3
LF delay
HF boost
level
0…-20 dB
LF (or MF*) out
HF
trim
to Channel 1
DataPort
HF out
to Channel 2
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