Operation Manual
CTs Multi-Channel Power Amplifiers
page 10
page 11
CTs Multi-Channel Power Amplifiers
Operation Manual
2.7 Choose Input Wire and Connectors
If you will be connecting an analog audio signal to the CTs amplifier, please
read this section. Figure 2.6 shows connector pin assignments for balanced
wiring, and Figure 2.7 shows connector pin assignments for unbalanced
wir ing.
When possible, use balanced wiring for signal input, which provides better
rejection of unwanted noise and hum. For more information, refer to the Crown
Amplifier Application Guide,
available online at www.crownaudio.com
NOTE: Custom wiring should only be performed by qualified
per sonnel.
2 Setup
(continued)
2.8 Choose Output Wire and Connectors
Crown recommends using professionally constructed, high-quality, two- or
four-conductor, heavy gauge speaker wire and connectors. You may use
ter minal spade lugs or bare wire for your output connectors (see Figure 2.8).
CTs amplifier terminal strips accept up to 10 AWG terminal forks which fit over
a #8 screw. For best results, Crown recommends Panduit part #PV10-10LF-L
or equivalent terminal spade lug. Screw spacing is shown in Figure 2.8.
To connect outputs, first remove the touch-proof cover plate covering the
ter minal strip by removing the screw which holds it in place.
To prevent the possibility of short-circuits, wrap or otherwise insulate exposed
loudspeaker cable and connectors. Also, a touch-proof cover plate, which
covers the terminal strips, is provided to help prevent short circuits. The cover
plate should be reinstalled after connecting outputs.
Suggested below are guidelines to select the appropriate size of wire based on
the distance from amplifier to speaker. Check with local code as this may vary.
Distance
Wire Size
up to 25 ft. (7.6 m)
16 AWG
26-40 ft. (7.9-12.2 m)
14 AWG
41-60 ft. (12.5-18.3 m)
12 AWG
Over 60 ft. (18.3 m)
10 AWG
CAUTION
:
Never connect the speaker return to the chassis of the
amplifier, or damage to the amplifier may result.
CAUTION: Never use shielded cable for output wiring.
Figure 2.6 Balanced Input
Connector Wiring
See the Crown
Amplifier
Appli cation Guide
, available
online at www.crownaudio.com,
for pin assignments for
commonly used connector
types.
Output panel
shown with
touch-proof
cover plate
removed.
NOTE: CTs 8200 USP/CN is shown. Some CTs 4200 USP/CN features are in different locations.
Figure 2.7 Unbalanced Input
Connector Wiring
Figure 2.8 Output Connector Wiring
(Typical of Two C hannels)
2.9 Audio Wiring
CAUTION: Never change the position of
the Mode Switch while the amplifier
power is on.
2.9.1 Dual 8/4 Mode
Typical analog input and output wiring, along
with level control and Mode Switch settings are
shown in Figure 2.9. Make sure the Mode switch
is set to the “Dual 8/4” position.
Cobranet
input wiring is covered in Section 2.11.
INPUTS: Connect input wiring for each channel.
OUTPUTS: Maintain proper polarity (+/–) on
output connectors.
Connect the Channel 1 speaker’s positive (+) lead
to amplifier Channel 1 positive terminal; repeat
for negative (–). Repeat each channel wir ing as
for Channel 1.
2.9.2 Dual 70V Mode
CAUTION: Never change the position of
the Mode Switch while the amplifier
power is on.
Typical input and output wiring, along with level
control and Mode Switch settings are shown in
Figure 2.10. Make sure the Mode switch is set to
the “Dual 70V” position.
INPUTS: Connect input wiring for each channel.
OUTPUTS: Maintain proper polarity (+/–) on
output connectors.
Connect Channel 1 positive (+) speaker load to
Channel 1 positive terminal of amp; repeat for
negative (–). Repeat each channel wiring as for
Channel 1.
2 Setup
(continued)
Figure 2.9 System Wiring and Control Settings, Dual Mode, 8/4 Ohm
Figure 2.10 System Wiring and Control Settings, Dual Mode, 70V
Output panel
shown with
touch-proof
cover plate
removed.
Output panel
shown with
touch-proof
cover plate
removed.
CH 4
DUAL
DUAL
BRIDGE
CH 3
CH 2
DUAL
DUAL
BRIDGE
CH 1
See the Crown
Amplifier
Appli cation Guide
, available
online at www.crownaudio.com,
for pin assignments for
commonly used connector
types.
CH 4
DUAL
DUAL
BRIDGE
CH 3
CH 2
DUAL
DUAL
BRIDGE
CH 1
70V
70V
Summary of Contents for CTs 4200USP/CN
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