9
English
If the unit is to be put out of operation
definitively, take it to a local recycling
plant for a disposal which is not harmful
to the environment .
3 Applications
This digital stereo PA amplifier with a peak power
of 300 W is specially designed, for example, for
applications on stage and in discothèques . It
allows connection of up to five audio units to
be selected via input switches .
4 Setting Up / Installation
The amplifier is designed for installation into a
rack (482 mm / 19”); however, it can also be used
as a table-top unit . In order to ensure sufficient
cooling, air must always be able to flow freely
through all air vents .
4.1 Rack installation
For installation into a rack, screw the two
mounting brackets provided to the left and right
sides of the housing (fig . 3) . In the rack, the
amplifier requires a height of 1 RS (rack space
= 44 .45 mm) .
The hot air given off by the amplifier must
be dissipated from the rack; otherwise heat will
accumulate in the rack which may not only dam-
age the amplifier but also other units in the rack .
In case of insufficient heat dissipation, install a
ventilation unit into the rack .
5 Connecting the Amplifier
Prior to making or changing any connections,
switch off the amplifier and the units to be con-
nected .
1) Connect the audio units (e . g . CD / MP3 player,
mixer, radio) to the input jacks (1, 10) . When
using the RCA jacks (10), always connect the
left channel to the white jack and the right
channel to the red jack . The 3 .5 mm jack (1)
should be used for a unit with low output
level or for units not permanently operated
with the amplifier .
2) The highest output power is obtained when
4 Ω speakers are connected . However, it is
also possible to connect 8 Ω speakers which
will slightly reduce the output power . The
minimum RMS power capability of the speak-
ers must be as follows:
4 Ω speaker 125 W
8 Ω speaker 75 W
Connect the speakers to the speaker jacks*
(12) or to the terminals (11) . When operat-
ing speakers at the speaker jacks and at the
terminals at the same time, only use speakers
with a minimum impedance of 8 Ω to prevent
overload of the amplifier .
* Contact configuration of a plug, see fig . 2
After inserting a plug into the jack, turn it clockwise
until it engages . To remove the plug, pull back the
latch on the plug and turn the plug counter-clock-
wise .
When using the terminals, always connect
the marked core of the speaker cables to a
red terminal .
Different possibilities for connecting multiple
speakers to one channel are shown in fig . 4
which also shows the minimum load of the
speakers . When interconnecting multiple
speak ers, always observe the correct positive
and negative connections and make sure that
the total impedance is at least 4 Ω .
3) Via the mains jack (8), connect the amplifier
to a socket (230 V/ 50 Hz) using the mains
cable provided .
6 Operation
Hint:
To prevent switching noise, switch on the
units connected to the amplifier before switch-
ing on the amplifier . After operation, switch
off the amplifier before switching off the units
connected .
1) Before switching on the amplifier for the
first time, set the volume controls LEFT (4)
and RIGHT (6) to zero to make sure that the
volume will not be too high . Then switch on
the amplifier with the POWER switch (7) . The
power LED ON (5) will light up .