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22 ACU16-C Amp Control Unit
ACU16-C & NHB32-C Owner’s Manual
Rear Panel
A Grounding screw
For electrical safety reasons, it’s important that the ACU16-C is grounded properly. The
supplied power cord has a three-pin plug, and if the ground terminal of the AC outlet is
grounded, then the unit will be grounded sufficiently through the power cord. If the AC
outlet does not provide a suitable ground, this screw must be connected to a good ground
point. Grounding is also an effective way to eliminate hum, interference, and other noise.
B AC IN connector
This connector is used to connect the ACU16-C to an AC outlet via the supplied power
cord. Connect the socket-end of the supplied power cord to the AC IN. Connect the
plug-end to a suitable AC wall outlet, one that conforms to the power supply requirements
stated on the ACU16-C’s rear panel. Use the supplied retaining clamp to secure the power
cord, preventing inadvertent disconnection.
C RS-485 port
This RJ-45 port is used to connect the ACU16-C to a network of up to 32 Yamaha PCxxxxN
series power amplifiers for control and monitoring. Networkable Yamaha power amplifiers
are connected together in a daisy-chain fashion using standard CAT3 or CAT5 Ethernet
cables, maximum length end-to-end, 1 kilometer. UTP (Unshielded Twisted Pair) or STP
(Shielded Twisted Pair) cable can be used.
D PRIMARY & SECONDARY CobraNet ports
These RJ-45 ports are used to connect the ACU16-C to the primary and secondary Cobra-
Net networks. Primary and secondary can be used to build redundancy into systems. Under
normal conditions, the ACU16-C uses the PRIMARY port. However, if communication via
that port fails, it will automatically switch to the SECONDARY port and operation will con-
tinue uninterrupted. Straight 100Base-TX CAT5 Ethernet cables should be used to connect
the ACU16-C to a CobraNet network. Use STP (Shielded Twisted Pair) cables to protect
against electromagnetic interference. If necessary, two CobraNet devices can be connected
together using a crossover 100Base-TX Ethernet cable. Straight and crossover cables are not
interchangeable.
E TO COMPUTER port
This 9-pin male D-sub port is used to connect the ACU16-C to a COM port on a PC run-
ning NetworkAmp Manager. It’s an RS-232C serial interface, supporting cable runs of up
to 15 meters. The front panel USB port offers an alternative method of connection. The PC
port to be used for communication with the ACU16-C is set in NetworkAmp Manager.
F Euro-block connectors
These Euro-block connectors output 16 balanced analog
audio signals for connection to power amplifier inputs.
CobraNet audio channels are assigned to these outputs in
NetworkAmp Manager. There are eight 6-way Euro-block
connectors, each with hot (+), cold (–), and ground terminals
for two audio channels. The supplied Euro-block plugs should
be wired as shown. Tighten the screws to secure the wires. Be
careful to clamp the actual conductor, not its insulation.
Wa r ning: Tu rn off all equipment connected to the ACU16-C before making any connections.
1 2 3 4 5 6
+
–
G