Operation; Specifications; Power Supply - IMG STAGE LINE STA-125 Instruction Manual

Especially with long connection cables, it is
preferable to use the balanced XLR jacks:
A balanced signal transmission will offer the
best interference suppression .
5.2 Speakers
The connector panel OUTPUT (9) offers both
terminals and speaker jacks to connect the
speakers . The terminals and the speaker jacks
are connected in parallel .
Connect the two speakers (minimum
impedance: 4 Ω) either to the terminals or to
the jacks: LEFT = left channel, RIGHT = right
channel . If 4 Ω speakers are used, they must
be designed for a minimum load of 100 W
8 Ω speakers for a minimum load of 80 W
Refer to Fig . 3 or Fig . 4 .
➌ Connecting the pair of speakers to the terminals
4 Ω, 100 W 4 Ω, 100 W
rms rms
8 Ω, 80 W 8 Ω, 80 W
rms rms
To connect a speaker: Connect its positive
pole (marked core of the speaker cable) to the
red terminal and connect its negative pole to
the black terminal .
➍ Connecting the pair of speakers to the jacks
4 Ω, 100 W
rms
8 Ω, 80 W
rms
The figure shows the pin configuration of the
connector plugs . In the amplifier, pin 1+ is
connected to pin 2+ and pin 1– is connected
to pin 2– . Therefore, it is also possible to use
the pair 2+ / 2− instead of the pair 1+ /1− .
After inserting the plug into the jack, turn
the plug clockwise until it engages . To remove
the plug, pull back the latch on the plug and
turn the plug counter-clockwise .
5.2.1 Connecting multiple speakers
to one channel
To connect multiple speakers to one channel,
the total impedance of the speakers must not
fall below 4 Ω at any channel; otherwise, the
amplifier may be damaged .
Figures 5 to 7 show examples for connecting
two speakers to one channel . Important: For
the examples of connection 5 and 6, make
sure to use speakers with a minimum imped-
ance of 8 Ω; otherwise, the total impedance
of the speakers will fall below the admissible
value!
Connecting two speakers to one channel using
➎
the terminals and jacks (internally connected in
parallel)
,
rms
.
rms
8 Ω
50 W 50 W
rms
➏ Connecting two speakers in parallel to one channel
using the terminals
8 Ω 8 Ω
50 W 50 W
rms rms
➐ Connecting two speakers in series to one channel
using the terminals
4 Ω, 100 W
rms
8 Ω, 80 W
rms
4 Ω
40 W
rms
4 Ω
40 W
rms

5.3 Power supply

For power supply, connect the mains cable
provided to the mains jack (5) first and then
to a mains socket (230 V~/ 50 Hz) .
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may be reproduced in any form or by any means for any commercial use.
8 Ω
rms
8 Ω 8 Ω
50 W 50 W
rms rms
8 Ω 8 Ω
50 W 50 W
rms rms
4 Ω
40 W
rms
4 Ω
40 W
rms
® INTERNATIONAL GmbH & Co. KG. No part of this instruction manual

6 Operation

Hint: To prevent switching noise, always switch on
the other units of the audio system before switching
on the power amplifier and switch off the power
amplifier before switching off the other units .
1) Before switching on the amplifier, set the
two volume controls (2) to zero to make
sure that the initial volume will not be too
high .
2) Use the POWER switch (4) to switch the
amplifier on and off . The power LED ON (1)
will light up when the amplifier is switched
on .
3) Use the volume controls (2) to adjust the
volume: Control L-CH for the left channel;
control R-CH for the right channel . In case
of overload of a channel, the correspond-
ing red LED CLIP (3) will light up . Turn back
the control accordingly .
CAUTION Never adjust a very high
volume . Permanent high
volumes may damage your
hearing! Your ear will get
accustomed to high vol-
umes which do not seem
to be that high after some
time . Therefore, do not fur-
ther increase a high volume
after getting used to it .

7 Specifications

RMS output power
Stereo 4 Ω: � � � � � � � � � 2 × 100 W
Stereo 8 Ω: � � � � � � � � � 2 × 80 W
Max� output power: � � � � 250 W
Input sensitivity/
input impedance: � � � � � � 500 mV/23 kΩ (XLR)
1 V/17 kΩ (RCA)
Frequency range: � � � � � � 20 – 20 000 Hz
S/N ratio: � � � � � � � � � � � � > 70 dB
THD: � � � � � � � � � � � � � � � < 0�01 %
Connections
Inputs: � � � � � � � � � � � � XLR jacks (bal�) and
RCA jacks
Outputs: � � � � � � � � � � � speaker terminals and
(Speakon
speaker jacks
Power supply
Mains voltage: � � � � � � 230 V~/50 Hz
Power consumption: � � 400 VA
Dimensions: � � � � � � � � � 482 × 88 × 220 mm
(W × H × D), 2 RS
Weight: � � � � � � � � � � � � � 7�6 kg
Subject to technical modification .
® compatible)
7