Protective Circuits - IMG STAGELINE STA-225 Manual De Instrucciones

7 Protective Circuits

The protective circuits are provided to prevent
damage to the speakers and the amplifier. The
integrated level limiter reduces the input signal
when the limit level is reached at the output. If
the amplifier is overloaded, distortions can thus
be prevented which could damage the speakers.
With the switch LIMITER (10) this function can
be switched on and off [indication
LIMT OFF
(g)].
Due to an additional protective circuit the
speakers are separated from the output of the
channel concerned. If it is active, the correspon-
ding red PROTECT LED (2) lights up:
1. for a short time after switching-on (switch-on
delay)
2. in case of overload / overheating, in this case,
PROT OFF
the indication
PROT ON
changes to on the display (3)
After cooling-down, the amplifier channel
continues its operation independently.
In standard operation the display shows the tem-
perature at the power transistors separately for
both channels (d). With higher temperatures the
fan control ensures that the fan of the channel
concerned runs at higher speed.
If a PROTECT LED does not extinguish after
switching-on or after cooling-down after an over-
load, the amplifier must be switched off and the
cause for the defect must be eliminated.
8 Specifications
Model
RMS output power
stereo at 4 Ω
LIMT ON
or
stereo at 8 Ω
bridge operation at 8 Ω
Input sensitivity for
rated power at 8 Ω
Input impedance
Frequency range
Channel separation
(c) additionally
S / N ratio
THD
Connections
inputs
outputs
Ambient temperature
Power supply
Max. power consumption
Dimensions (W × H × D)
Weight
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manual may be reproduced in any form or by any means for any commercial use.
STA-225
2 × 350 W
2 × 250 W
700 W
1.3 V
10 kΩ
XLR and 6.3 mm jacks, balanced
screw terminals and speaker jacks
(Speakon compatible)
230 V~/ 50 Hz
1500 VA
482 × 100 × 330 mm,
2 RS
10.3 kg
® INTERNATIONAL GmbH & Co. KG. No part of this instruction
STA-235
2 × 500 W
2 × 400 W
1000 W
1.2 V
10 kΩ
10 – 50 000 Hz
> 50 dB
> 80 dB
< 0.1 %
0 – 40 °C
230 V~/ 50 Hz
2000 VA
482 × 100 × 330 mm,
2 RS
11.5 kg
Subject to technical modification.
GB
9