Wiring For Bridge-Mono 70 Volt Mode (140 Volt Output) - Crown Com-Tech CT-1600 Reference Manual

Com-Tech 200/400/800/1600 Power Amplifiers
minals (see Figure 3.6 and the middle illustration in
Figure 3.7). The positive lead from the load connects to
the positive channel 1 terminal, and the negative (or
ground) lead from the load connects to the positive
channel 2 terminal. Do not connect the output
grounds ( ). Also, the load must be balanced (neither
side shorted to ground).
CAUTION: Only connect balanced equipment (meters,
switches, etc.) to the Bridge-Mono output. Both sides of
the line must be isolated from the input grounds or os-
cillations may occur.
PARALLEL
MONO
P A R A L L E L - M O N O
Parallel-Mono mode is used to drive loads with a total
impedance of less than 4 ohms when using 8/4 ohm
output mode (see Bridge-Mono if the load is greater
than 4 ohms). This mode can also be used to drive a
MIXER
Com-Tech Amplifier
BRIDGE-MONO
70 VOLT MODE
(140 VOLT OUTPUT)
DUAL
BRIDGE
MONO
CHANNEL 1
DO NOT
USE
BB
C H - 2 I N P U T
PUSH TO RESET + – +
Programmable
Input Processor (P.I.P.)
11 10 9 8
13 7
15 6
17 5
19 4
21 3
25 2
32 1
.5
dB 0
CH-2
TURN OFF CHANNEL 2 (CCW)
IN BRIDGE-MONO MODE.
DUAL
TURN OFF THE AMPLIFIER
PARALLEL BRIDGE
BEFORE CHANGING
MONO MONO
THE DUAL/MONO SWITCH.
Fig. 3.6 Wiring for Bridge-Mono 70 Volt Mode (140 Volt Output)
single high-powered 70 volt constant voltage line.
Parallel-Mono installation is very different from the
other modes and requires special attention.
WARNING: Both channels must be configured for the
same output mode (8/4 ohm or 70 volt) before switch-
ing to Parallel-Mono mode.
To select Parallel-Mono mode, turn off the amplifier
and slide the dual/mono switch to the left (as you face
the back panel). Connect the input signal to channel 1
only. The channel 2 input jack and level control are by-
passed in this mode, so they should not be used.
Note: It is normal for the channel 2 IOC indicator to stay
on in Parallel-Mono mode.
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-
8/4 70 8/4 70
OHM VOLT OHM VOLT
CH2 CH1
C H - 1 I N P U T
–
11 10 9 8
13 7
15 6
17 5
19 4
21 3
25 2
32 1
.5
dB 0
CH-1
140 VOLT LINE
DO NOT USE
THE GROUND
TERMINALS
TURN OFF THE AMPLIFIER
BEFORE CHANGING THE
OUTPUT MODE SWITCHES.
WARNING: BOTH CHAN-
NELS MUST BE SET TO
70 VOLT MODE.
+
+
16, 8, OR 4 OHM
–
COM
140 VOLT STEP-DOWN
LOUDSPEAKERS
TRANSFORMERS
+
+
16, 8, OR 4 OHM
–
COM
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