Setting The Limiter; Application Example: Crossover Network; Protective Circuit; Specifications - IMG STAGELINE STA-1600DSP Mode D'emploi

Values for the limiter:
Threshold: threshold value in dBV (0 dB = 1 V); the gain will be at-
tenuated when the signal level has exceeded this value
(= max . output level allowed)
The value set here will be the upper limit for the threshold
value of the compressor .
Release: release time, i . e . the time the gain takes to reach its
original value after the signal level has fallen below the
threshold value

7.4.5.1 Setting the limiter

To limit the load of the speaker to a specific value, approximate the
setting of the limiter threshold by means of the following formula:
Value of the limiter threshold: = 20 log
P : rated power (RMS power) for the corresponding imped-
nom
ance
P : desired maximum power for the same impedance
lim
Example:
At the output CH A OUT of the STA-1600DSP, an 8 Ω speaker is to be
limited to a power of 50 W:
P = 500 W at 8 Ω (cf . chapter 10)
nom
P = 50 W
lim
Value of the limiter threshold = 20 log

8 Application Example: Crossover Network

Fig . 18 shows how a crossover network for a two-way speaker system
can be implemented by means of an amplifier .
– The output of the audio source is connected to the input CH A IN .
– By means of an XLR cable, the signal is routed from the jack LINK
OUT of the input CH A IN to the input CH B IN .
– The operating mode STEREO is selected .
– The high-pass filter is active in channel A; the low-pass filter is active
in channel B . Both filters are set to a crossover frequency that is
matched to the speakers used .
– The tweeter is connected to the output CH A OUT; the bass speaker
is connected to the output CH B OUT .
– The volume balance between the high-frequency range and the
low-frequency range can be changed by means of the setting GAIN .
– Depending on the position of the speakers, signals can be delayed by
means of the signal delay DELAY to compensate different distances
between the speakers and the audience .
– The filters of the parametric equalizers can be used to compensate
room resonances, for example .
– To protect the speakers against overload, the level limiter LIMITER
can be used .
Work Mode
CH A IN
Signal
A
Source
D
LINK OUT
Work
Mode STEREO
A
D
CH B IN
Fig. 18 Example: crossover network
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No part of this instruction manual may be reproduced in any form or by any means for any commercial use.
√ P
/ P
lim nom
10
√ 50 W/ 500 W = −10 dB
10
X-Over
PEQ
HPF PEQ 1 – 9
LPF PEQ 1 – 9
® INTERNATIONAL GmbH & Co. KG.

9 Protective Circuit

The protective circuit is designed to prevent damage to the speakers
and the amplifier . The LED indicator PROTECT (1) will light up while
the protective circuit is activated:
– for a few seconds after switch-on (switch-on delay)
– when the amplifier is overheated or when there is a short circuit
at a speaker output
– when the unit is being switched off
When the LED indicator PROTECT lights up during operation, when it
does not extinguish after switch-on or when the circuit breaker (14)
has tripped, switch off the amplifier and eliminate the error . If required,
press the button of the circuit breaker to reset it .

10 Specifications

Model
Output power
RMS power
Stereo at 4 Ω
Stereo at 8 Ω
Bridge at 8 Ω
Peak power
Amplifier class
Input sensitivity
Input impedance
Frequency range
S / N ratio
Channel separation
THD
Power supply
Max. power consumption
Ambient temperature
Dimensions (W × H × D)
Rack spaces (RS)
Weight
Delay Gain
Phase
MUTE
DELAY GAIN PHASE COMPRESSOR
INVERT
MUTE
DELAY GAIN PHASE COMPRESSOR
INVERT
STA-1600DSP
2 × 670 W
2 × 500 W
1350 W
2700 W
AB
1 V
20 kΩ (bal.)
10 kΩ (unbal.)
20 – 20 000 Hz (±1 dB)
> 90 dB
> 55 dB
< 0.1 %
230 V/ 50 Hz
2600 VA
0 – 40 °C
483 × 88 × 430 mm
2
17 kg
Subject to technical modification .
Compressor
Limiter
out out
D
A
in in
LIMITER
out out
D
A
in in
LIMITER
STA-2200DSP
2 × 870 W
2 × 675 W
1750 W
3000 W
H
3400 VA
483 × 88 × 496 mm
23 kg
CH A OUT
HF
CH B OUT
LF
23