Yamaha ACU16-C, NHB32-C

22 ACU16-C Amp Control Unit

ACU16-C & NHB32-C Owner’s Manual

Rear Panel

AGrounding 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.

BAC 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.

CRS-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.

DPRIMARY & 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.

ETO 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.

FEuro-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.

Warning: Tu rn off all equipment connected to the ACU16-C before making any connections.

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