IMG STAGELINE STA-225 Bedienungsanleitung Seite 7

Stereo PA amplifier
Please read these operating instructions careful-
ly prior to operation and keep them for later refer -
ence. All operating elements and connections
described can be found on the fold-out page 3.
1 Operating Elements
and Connections
1.1 Front panel
1 Volume control
each for the channels L-CH and R-CH
Note: In bridge operation the control of the
channel R-CH has no function.
2 Status LEDs
each for the channels L-CH and R-CH
PROTECT
lights up when the protective circuit sepa-
rates the speaker from the amplifier: for a
short time after switching-on and in case of
overload/overheating of the amplifier
LIMITER
lights up when the limiter circuit is active and
reduces the signal to prevent overload
SIGNAL/ -20 dB/ -10 dB
show the level of the output signal
3 LC display to show the operating parameters
and status ( chapter 1.3)
4 Button LOAD 4/ 8 OHM to select the speaker
load for the correct calculation of the power
indication on the display (3) [if required, press
several times]
5 Mains switch POWER
1.2 Rear panel
6 Input as an XLR jack
each for the channels L-CH and R-CH
Note: In bridge operation the input of channel
R-CH has no function.
7 Input as a 6.3 mm jack, balanced, for con-
nection of a signal source with line level, each
for the channels L-CH and R-CH, alterna-
tively to the XLR jack (6)
Note: In bridge operation the input of the
channel R-CH has no function.
8 Switch GROUNDLIFT to separate the signal
ground from the housing ground:
GROUND
signal ground and housing ground are con-
nected
LIFT
signal ground and housing ground are sepa-
rated (groundlift)
9 Switch MODE for the selection of the oper -
ating mode STEREO / BRIDGE
( chapter 6.1)
10 ON / OFF switch LIMITER for the automatic
level limitation
11 Speaker outputs as screw terminals, alterna-
tively to the speaker jacks (12 and 13)
12 Speaker jack R-CH
13 Speaker jack L-CH
14 Speaker jack BRIDGE for bridge operation
15 Mains jack for connection to a socket
(230 V~/50 Hz) via the supplied mains cable
16 Support for the mains fuse;
only replace a blown fuse by one of the same
type
1.3 Display
Standard indication during operation (fig. 4)
a output power of both outputs, calculated
according to the output voltage measured
and the load impedance selected [button
LOAD 4/ 8 OHM (4)]
Note: The calculation is not effective in
bridge operation.
CLIP ON/ OFF
b for both outputs; if
shown, the amplifier input is overloaded. In
this case reduce the input level with the cor-
responding control (1).
PROT ON/ OFF
c (= PROTECTION,
ter 1.1, item 2, status LED PROTECT)
d temperature at the power transistors of both
channels
e vertical bargraph indication for the output sig-
nals of both channels
Indication for a few seconds after actuating a vol-
ume control (1), the switch LIMITER (10) or the
switch MODE (9) [fig. 5]
STEREO/ BRIDGE
f of the selected operating
mode
g check for the switch LIMITER (10)
LIMT ON
= limiter switched on
LIMT OFF
= limiter switched off
ATTEN
h (attenuation) for attenuation of the
input signals shows the position of the vol-
ume controls (1) numerically (i) and as a ver-
tical bar (j)
Indication for a few seconds after actuating the
button LOAD 4/ 8 OHM (4) [fig. 6]
k selected load impedance for the calculation
of the output power shown (a)
2 Safety Notes
The unit corresponds to all relevant directives of
the EU and is therefore marked with
WARNING The unit is supplied with haz-
ardous mains voltage. Leave ser -
vicing to skilled personnel only
and do not insert anything through
the air vents! This may cause an
electric shock hazard.
It is essential to observe the following items:
G
The unit is suitable for indoor use only. Protect
it against dripping water and splash water,
high air humidity, and heat (admissible ambi-
ent temperature range 0 – 40 °C).
G
Do not place any vessels filled with liquid, e. g.
drinking glasses, on the unit.
G
The heat being generated in the unit must be
carried off by air circulation. Therefore, the air
vents at the housing must not be covered.
G
Do not set the unit into operation, and imme-
diately disconnect the mains plug from the
mains socket if
1. there is visible damage to the unit or to the
mains cable,
2. a defect might have occurred after a drop or
similar accident,
3. malfunctions occur.
CLIP ON
is
The unit must in any case be repaired by
skilled personnel.
G
Never pull the mains cable to disconnect the
mains plug from the mains socket, always
chap-
seize the plug.
G
For cleaning only use a dry, soft cloth, never
use chemicals or water.
G
No guarantee claims for the unit and no liabil-
ity for any resulting personal damage or mate-
rial damage will be accepted if the unit is used
for other purposes than originally intended, if it
is not correctly connected or operated, or not
repaired in an expert way.
If the unit is to be put out of operation
definitively, take it to a local recycling
plant for a disposal which will not be
harmful to the environment.
3 Applications
This stereo PA amplifier is especially designed
for applications on stage and in the discotheque.
It can be used in stereo operation or in mono
bridge operation. Extensive protective circuits
protect the amplifier and the speakers connected.
Two powerful, temperature-controlled fans pro-
vide the necessary cooling of the amplifier.
.
7