Crown ct-1610 Guía De Referencia
Page 19
Com-Tech Power Amplifiers
Reference Manual
Fig. 3.8 Balanced Input Wiring
Fig. 3.9 Unbalanced Input Wiring
T
win-lead shielded cable
INPUT
2-wire line cord
(or battery power)
Output
Floating
source
Shield connected
to ground terminal
to ground terminal
3-wire grounded line cord
(or other ground connection)
Shield not connected
at this end
at this end
Grounded
source
3-wire grounded line cord
(or other ground connection)
Input ground
terminal not used
terminal not used
Grounded
source
Single-conductor coax
or twisted pair
+
Output
+
2-wire line cord
(or battery power)
Output
Floating
source
Shield connected to both
negative (–) and ground
input terminals
negative (–) and ground
input terminals
+
Output
+
+
–
INPUT
+
–
INPUT
+
–
INPUT
+
–
+
–
INPUT
INPUT
2-wire line cord
(or battery power)
Note: If two or more channels with
the same input ground reference
are driven from the same
floating source, connect
only one shield to the
source chassis.
Floating
source
–
+
3-wire grounded line cord
(or other ground connection)
Output
Shield not connected
at this end
at this end
Grounded
source
–
+
Output
+
–
To select Parallel-Mono mode, turn off the amplifier and
slide the dual/mono switch to the PARALLEL MONO
(left) position. Connect the input signal to Channel 1
only. The Channel 2 input jack and Input Attenuation
control are bypassed in this mode, so they should not
be used.
slide the dual/mono switch to the PARALLEL MONO
(left) position. Connect the input signal to Channel 1
only. The Channel 2 input jack and Input Attenuation
control are bypassed in this mode, so they should not
be used.
Connect the load to the Channel 1 output as shown in
Figure 3.7 (top and bottom illustrations). The positive
lead from the load connects to the positive (+) terminal
of Channel 1, and the negative (or ground) lead from
the load connects to the ground ( ) terminal of Channel
1. Finally, install a jumper wire of at least 14 gauge be-
tween the positive (+) terminals of both channels.*
Figure 3.7 (top and bottom illustrations). The positive
lead from the load connects to the positive (+) terminal
of Channel 1, and the negative (or ground) lead from
the load connects to the ground ( ) terminal of Channel
1. Finally, install a jumper wire of at least 14 gauge be-
tween the positive (+) terminals of both channels.*
CAUTION: When Parallel-Mono wiring is installed, do
NOT operate in Dual or Bridge-Mono mode until the
wiring is removed (especially the jumper wire). Fail-
ure to do so will result in high distortion and exces-
sive heating.
NOT operate in Dual or Bridge-Mono mode until the
wiring is removed (especially the jumper wire). Fail-
ure to do so will result in high distortion and exces-
sive heating.
3.3.2 Audio Input Connection
The balanced inputs have a nominal impedance of 20 k
ohms (10 k ohms unbalanced) and will accept the line-
level output of most devices. The factory-installed PIP2-
BB provides a balanced three-terminal input barrier
block for each channel (see Figure 2.2). Optional PIP
modules like the
The balanced inputs have a nominal impedance of 20 k
ohms (10 k ohms unbalanced) and will accept the line-
level output of most devices. The factory-installed PIP2-
BB provides a balanced three-terminal input barrier
block for each channel (see Figure 2.2). Optional PIP
modules like the
PIP2-FXQ, etc., can provide female
XLR connectors, phone jacks and phono (RCA) con-
nectors. Various PIPs are also available which provide
a wide range of input signal processing features (see
Section 8).
nectors. Various PIPs are also available which provide
a wide range of input signal processing features (see
Section 8).
Proper input wiring depends on two factors: (1) whether
the input signals are balanced or unbalanced, and (2)
whether the signal source floats or has a ground refer-
ence. The following illustrations provide examples of
recommended connection techniques for each type of
signal source. (See Figures 3.8 and 3.9.)
the input signals are balanced or unbalanced, and (2)
whether the signal source floats or has a ground refer-
ence. The following illustrations provide examples of
recommended connection techniques for each type of
signal source. (See Figures 3.8 and 3.9.)
S O L V I N G I N P U T P R O B L E M S
Sometimes large subsonic (sub-audible) frequencies
are present in the input signal. These can damage loud-
speakers or step-down transformers by overloading or
overheating them. To attenuate such frequencies, place
a capacitor in series with the input signal line. The graph
in Figure 3.11 shows some capacitor values and how
they affect frequency response. Use only low-leakage
capacitors.
are present in the input signal. These can damage loud-
speakers or step-down transformers by overloading or
overheating them. To attenuate such frequencies, place
a capacitor in series with the input signal line. The graph
in Figure 3.11 shows some capacitor values and how
they affect frequency response. Use only low-leakage
capacitors.