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Introduction
Thank you for purchasing a Yamaha C450/320/160 series power amplifier.
This series of audio amps was developed from Yamaha's wealth of experience in building PA
equipment and its tradition of careful attention to every detail of circuit design. These amps
feature high power and superb quality together with superior reliability and stability, guaran-
teeing the highest possible audio performance.
Main features of the C450/320/160 series
• Two types of input (balanced XLR type connectors and barrier strip), and barrier strip
for outputs are provided.
• Three operating modes are provided: STEREO mode in which CHANNEL A and B
operate independently, PARALLEL mode in which a mono source is output by two amp
systems, and BRIDGE mode in which the unit operates as a single high-power amplifier.
• A SIGNAL indicator and CLIP indicator is provided for each channel.
• The PROTECTION indicator shows the status of protective circuitry such as power-on/
off protection, output muting, and the DC detection circuit. The TEMP indicator warns
of heat sink overheating.
• Variable-speed low-noise fan(s) ensures high reliability even under demanding condi-
tions.
• The C450/320/160 has implemented “EEEngine”, Yamaha’s epochal amp drive
technology to create an unrivaled high-efficiency drive.
The EEEngine’s energy-saver/low-heat-generation design has reduced power consump-
tion to 50% or less, and reduced heat generation to 35% or less (in field applications,
compared to Yamaha’s previous models), and has lead to a reduction in energy cost and
to less-restrictive installation requirements related to heat generation.
This owner's manual covers the three models C450, C320 and C160. In order to take full
advantage of your power amp and enjoy long and trouble-free operation, please read this
owner's manual carefully before use.
IMPORTANT NOTICE FOR
THE UNITED KINGDOM
Connecting the Plug and Cord
WARNING: THIS APPARATUS MUST BE EARTHED
IMPORTANT: The wires in this mains lead are coloured in accordance with
the following code:
GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
As the colours of the wires in the mains lead of this apparatus may not
correspond with the coloured markings identifying the terminals in your
plug, proceed as follows:
The wire which is coloured GREEN and YELLOW must be connected to
the terminal in the plug which is marked by the letter E or by the safety earth
symbol or coloured GREEN and YELLOW.
The wire which is coloured BLUE must be connected to the terminal which
is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal
which is marked with the letter L or coloured RED.
* This applies only to products distributed by YAMAHA KEMBLE
MUSIC (U.K.) LTD.