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Introduction
Thank you for purchasing a Yamaha XS350, XS250 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, guarantee-
ing the highest possible audio performance.
Main features of the XS350, XS250 series
• The unit is equipped with two types of inputs: balanced XLR and barrier strip, and two types
of outputs: barrier strip and binding post. This combination of inputs and outputs affords
flexible capabilities and accommodates a wide range of applications.
• 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 high pass/low pass switchable filter is provided for each channel. The high pass filter
features a continuous controller that allows you to change cut-off frequencies between
25 Hz and 150 Hz.
• 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.
• Variable-speed low-noise fan(s) ensures high reliability even under demanding conditions.
This owner's manual covers the two models XS350, XS250. 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.
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.