3 Applications
This digital stereo PA amplifier with a peak power of
300 W is specially designed, for example, for appli-
cations on stage and in discothèques. It allows con-
nection 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 accu-
mulate in the rack which may not only damage 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 chan-
nel 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 ampli-
fier.
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 speakers 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 operating speak-
ers at the speaker jacks and at the terminals at
the same time, only use speakers with a mini-
mum 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-clockwise.
When using the terminals, always connect the
marked core of the speaker cables to a red ter-
minal.
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 switching on
the amplifier. After operation, switch off the ampli-
fier before switching off the units connected.
1) Before switching on the amplifier for the first
time, set the volume controls L-CH (4) and R-
CH (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.
2) Use the switches INPUT SELECT (3) to select
the desired unit for reproduction. To prevent
loud switching noise, turn down the volume
when operating the switches.
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