Page 20
Contractor Series Power Amplifiers
Reference Manual
However, in both non-switching and conventional
switching designs, phase differences occur within the
power supply due to the inductance of the transformer.
This phase difference prevents much of the available
power from the AC mains from making its way to the
load.
PFC, however, compensates for phase differences in
the power supply, allowing more true power to be trans-
ferred to the amplifier. The result is more power with less
waste than any other conventional switching or non-
switching design.
As an added benefit, PFC also allows the amp to be
connected to any common AC line voltage, without con-
verting the power supply. This means that the CH4 and
CL4 are ready for any common line voltage.
5.3 Crown SST Modules
Crown optional SST (System Solution Topologies) mod-
ules were specially designed to improve the fidelity and
versatility of your audio system. They feature a variety
of professional signal routing and filtering capabilities,
with active crossovers that allow the audio signal to be
split and sent to auxiliary amplifiers. Your choice of SST
modules can be easily added to the amplifier by any
authorized Crown Service Center.
For information on wiring and configuration of amplifi-
ers equipped with an optional Crown SST crossover
module, please refer to the applicable SST Crossover
Reference Manual.
Refer to the following descriptions for an overview of
available Crown SST crossover modules.
5.3.1 SST-MX Crossover
The SST-MX crossover module features 24-dB/octave
Linkwitz-Riley tuned filters and stereo sub-bass outputs
for biamp operation of subs. See Figure 5.1 for SST-MX
block diagram.
Features of the SST-MX crossover include:
• Stereo biamp.
• 100-Hz fixed crossover
• 24-dB/octave Linkwitz-Riley tuned filters.
• Neutrik
®
Combo ¼-inch (6.35-mm) and XLR in-
put jacks.
• Barrier block balanced outputs.
• Optional high-pass filter bypass on amplified
outputs adapts system for full-range use.
5.3.2 SST-SX Crossover
The SST-SX crossover module features 24-dB/octave
Linkwitz-Riley tuned filters and mono-summed sub-
bass outputs for biamp operation of subs. See Figure
5.2 for SST-SX block diagram.
Features of the SST-SX crossover include:
• Mono-summed sub-bass output.
• 24-dB/octave Linkwitz-Riley tuned filters.
• Crossover switchable between 80 and 120 Hz.
• Neutrik
®
Combo (6.35-mm and XLR) input jacks.
• Male 3-pin XLR outputs
• Optional high-pass filter bypass on amplified
output adapts system for full-range use.
CH1
CH1
SUB
OUT
TB
CH2
SUB
OUT
100
Hz
LP
CH2
–
–
+
+
IN
BYP
ASS
100
Hz
HP
HOST
AMPLIFIER CH1
INPUT
HOST
AMPLIFIER CH2
INPUT
100
Hz
LP
24
dB/oct.
slope
100
Hz
HP
24
dB/oct.
slope
IN
BYP
ASS
100
Hz
LP
24
dB/oct.
slope
100
Hz
HP
24
dB/oct.
slope
–
+
–
+
–
+
3
2
1
–
+
3
2
1
Figure 5.1 SST-MX Crossover Block Diagram
