SYSTEM CONNECTIONS:
CAUTION:
CAUTION:
T
The C-20 Control Amplifier accepts both balanced and unbalanced inputs on either XLR or 1/4” TRS connectors. These
connectors are hardwired in parallel within the C-20 to allow for convenient equipment chaining, but only one input should
be physically connected to the unit at any time. Figure 3a shows the proper wiring schematic for each type of connector.
Since there are so many different connector types and signal levels employed by source equipment, some experimentation
may be necessary. Keep in mind that the C-20 can accept a wide range of signals and has an input sensitivity
control on the front panel.
WARNING:
MAKE ALL CONNECTIONS WITH THE AC POWER OFF!
CONNECTING THE OUTPUT OF THE C-20 CONTROL AMPLIFIER TO ANY
EQUIPMENT OTHER THAN THE C-20 OR A-20 MONITOR MAY CAUSE
EQUIPMENT DAMAGE.
IF USING CABLES OTHER THAN THOSE SUPPLIED WITH THIS SYSTEM, BE SURE
THAT NO CONDUCTOR IS WIRED TO THE XLR CASING. FAILURE TO DO SO
MAY CONSTITUTE A RISK OF ELECTRIC SHOCK.
POWER CONNECTIONS/FUSE:
CONTROL AMPLIFIER INPUT SECTION:
SPEAKER CABLE CONNECTIONS:
The C-20 includes a 20’ special purpose cable to connect the Control Amplifier to the Monitor. While these cables look similar to
standard microphone cables, they are constructed with lower and more consistent conductor impedance. Portions of the C-20’s
crossover circuitry are located in both the amplifier and speaker enclosures, and the cables supplied are an important part of this electrical
network. This allows the speaker cables to function as a neutral and transparent component in the system. Replacing or extending the
supplied cables with any other type will have a varying and unpredictable impact on the sound. If your installation requires the use of
alternative cables, you may consult the Cable Measurement Data Chart on our website. Be sure they are wired as shown in Fig. 3a.
Using the Vergence cables to connect the C-20 Monitor to the Control Amplifier is quite simple and straightforward: fit the
XLR connectors into the corresponding connectors on the Control Amplifier and Monitor until the connector locks.
he power cord receptacle contains a spare fuse located within the power connector.. To get at the fuse, remove the power cord and use a
small flat-head screwdriver to access the fuse compartment. When replacing the fuse with a spare, use only a fuse of the same power rating.
Located next to the power cord receptacle is a voltage selector, preset at the factory for the destination country; the power cord supplied is
appropriate for that voltage. As noted elsewhere in this manual, confirming the voltage selector setting before powering up the system is a
good idea.
2
3
1
TRS
1
3
2
XLR
PIN SIGNAL
PIN SIGNAL
1
2
3
GND
+
_
Fig. 3a Balanced Wiring Diagram
1
2
3
+ (SIGNAL)
- (GND)
Shield
SOURCE
A-20 INPUT
Fig. 3b Unbalanced Wiring Diagram
Fig. 4 Typical installation
INPUT VOLTAGE
115
C-20
MONITOR
MODEL C-20 MONITOR CONTROL AMPLIFIER.
SERIAL NO:
NHTPro
BENICIA, CALIFORNIA, U.S.A.
MADE IN TAIWAN G1
CAUTION:
CONNECTING OUTPUT
TO ANY PRODUCT OTHER THAN THE
NHTPro C-20 MONITOR MAY RESULT
IN SEVERE EQUIPMENT DAMAGE.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN.
AVIS: RISQUE DU CHOC ELECTRONIQUE -
NE PAS OUVRIR.
CAUTION:
FOR CONTINUED PROTECTION AGAINST
FIRE REPLACE ONLY WITH SAME TYPE 250V FUSE.
FUSE TYPE:
T9A 250V FOR 110/120V.
T5A 250V FOR 220/240V.
50/60Hz - 950W
INPUT
Source
To AC outlet
To monitor via
supplied red cable
