6
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Suomi
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0
10
CH 1
4 Ω
PEAK
SIG
PROT
100 V
3
4
POWER
0
10
0
10
0
10
0
10
CH 1
CH 2
CH 3
CH 4
4 Ω
PEAK
SIG
PROT
100 V
4 Ω
PEAK
SIG
PROT
100 V
2
1
➌
Front panel
English
English Page
Class D PA Amplifier
with 4 Channels
These instructions are intended for installers
of the unit with technical knowledge of 100 V
technology in PA applications . Please read the
operating instructions carefully prior to opera-
tion and keep them for later reference .
1 Overview
1.1 Front panel
1
LED indicator; to indicate that the amplifier
has been switched on or switched to the
standby mode (
☞
“Standby” in chapter 5)
2
POWER switch
for each channel CH 1 to CH 4:
3
Level control
4
LED indicators
PROT
Will light up when the protective circuit
responds; it will light up briefly each
time the amplifier is switched on or off
(or switched to the standby mode*) .
PEAK
Will light up when the maximum signal
level allowed has been reached; if the
LED indicator lights up continuously,
turn back the level control .
SIG
Will light up when a specific signal level
has been reached (depending on the
level control) .
100 V
or
4 Ω
The operating mode set will be in-
dicated by the LED indicator that
lights up .
* via a switch connected to the terminals STANDBY (7)
1.2 Rear panel
5
Switch to set the operating mode:
“100 V” = operation with 100 V speakers
“4 Ω” = operation with low-impedance
speakers
6
Power cable for connection to 230 V/ 50 Hz
7
Plug-in screw terminals STANDBY to con-
nect a switch for the function “Switch on
Standby”; if
no
switch is connected,
make sure that the terminals are bridged
8
Plug-in screw terminals MUTE to connect
a switch for muting the amplifier
for each channel CH 1 to CH 4:
9
Plug-in screw terminals “100 V/ 4 Ω” to
connect the speakers
10
Plug-in screw terminals FAILED; can be
used as a fault indication output for
remote monitoring:
☞
chapter 4 .2 .3
11
Plug-in screw terminals INPUT: balanced
input to connect a mono signal source with
line level
2 Safety Notes
The product corresponds to all relevant direc-
tives of the EU and is therefore marked with .
WARNING
The product uses dangerous
mains voltage . Leave servicing
to skilled personnel only and
never insert anything into the
air vents . Risk of electric shock!
In the operating mode “100 V”, there is a
hazard of contact with a dangerous voltage
of up to 100 V at the speaker terminals (9) .
Always switch off the amplifier before making
or changing any connections .
•
The product is suitable for indoor use only .
Protect it against dripping water, splash
water, high air humidity and heat . The
admissible ambient temperature range is
0 – 40 °C .
•
Do not place any vessel filled with liquid on
the product, e . g . a drinking glass .
•
The heat generated inside the product must
be dissipated by air circulation; never cover
the air vents of the housing .
•
Do not use the product and immediately
disconnect it from the mains socket
1 . if the unit or the mains cable is visibly
damaged
2 . if a defect might have occurred after the
unit was dropped or suffered a similar
accident,
3 . if malfunctions occur .
Any repairs must be made by skilled per-
sonnel only .
•
A damaged mains cable must be replaced
by skilled personnel only .
•
Never pull the mains cable to disconnect the
mains plug from the mains socket, always
seize the plug .
•
For cleaning only use a dry, soft cloth; never
use water or chemicals .
•
No guarantee claims for the product and no
liability for any resulting personal damage
or material damage will be accepted if the
product is not correctly used or if it is not
repaired in an expert way .
•
Important for UK Customers!
The wires in this mains lead are coloured in
accordance with the following code:
green / yellow = earth
blue = neutral
brown = live
As the colours of the wires in the mains lead
of this appliance may not correspond with
the coloured markings identifying the termi-
nals in your plug, proceed as follows:
1 . The wire which is coloured green and yel-
low must be connected to the terminal in
the plug which is marked with the letter
E or by the earth symbol
⏚
, or coloured
green or green and yellow .
2 . The wire which is coloured blue must
be connected to the terminal which is
marked with the letter N or coloured
black .
3 . The wire which is coloured brown must
be connected to the terminal which is
marked with the letter L or coloured red .
Warning
– This appliance must be earthed .
If the product is to be put out of oper-
ation definitively, dispose of the prod-
uct according to local regulations .
3 Applications
This class D amplifier is specially designed for
PA systems that use 100 V technology . How-
ever, it is also possible to use low-impedance
speakers instead of 100 V speakers .
Via four amplifier channels, the volume
for up to four speaker zones can be separately
adjusted . Each channel provides a balanced
line level input and an error message output
for remote monitoring of the operation state
of the channel (both connections designed as
plug-in screw terminals) . In addition, two ex-
ternal switches can be connected: a switch to
mute all four channels at the same time and a
switch for the function “Switch on
Standby” .
4 Installation
Installation must be made by skilled personnel
only .
4.1 Setting up the amplifier
The amplifier is designed for insertion into a
rack (482 mm / 19"), but it can also be set up on
its own . In order to ensure sufficient cooling of
the amplifier, air must always be able to flow
freely through all air vents .
4.1.1 Rack installation
For rack installation, 1 rack space (1 RS =
44 .45 mm) is required . For a safe installation
of the amplifier, lateral rails or a bottom plate
are recommended .
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
damage the amplifier but also other units in
the rack . In case of insufficient heat dissipation,
install a ventilation unit into the rack .