FONESTAR SR-1590 Manual De Usuario página 3

CONNECTION AND OPERATING
- The mixer/amplifier must be switched off while the connections are being made.
- The model SR-1590 acts as a feedback suppressor for an external source connected via a mic. level
balanced input or a line level balanced input.
- Connect the external source output (microphone mixer, conference system, etc.) to the MIC INPUT or
LINE INPUT on the rear panel of the suppressor, depending on its level. Turn on the power and activate the
feedback suppressor by pressing the central middle button on the front panel until the ACTIVE indicator
turns on.
- The outputs MIC OUTPUT or LINE OUTPUT can be reintroduced in the external source if it has PRE OUT/
AMP IN or SEND/RETURN. If it has not, the outputs MIC OUTPUT or LINE OUTPUT can be introduced
in a power amplifier.
MIXER
AMPLIFIER
AMP IN PREOUT
RETURN SEND
OUTPUT INPUT 3
R
L
GND LIFT AUX AUX
ACOUSTIC FEEDBACK DETECTION
The main aim of the SR-1590 is to eliminate coupling or acoustic feedback in the inputs connected to it.
POWER AMPLIFIERS
Acoustic feedback is produced when the sound reproduced by the loudspeakers is captured again by the
microphone to be amplified again. It is known as the Larsen effect. It may be due to a bad distribution of
microphones in a room, to the acoustic conditions of the premises and to an excess of amplification.
The feedback suppressor removes the coupling by displacing the frequency of the audio signal a few hertz
LINE OUT
using very precise oscillation. In this way, it avoids the production of acoustic feedback at a frequency that
is favoured by the amplification system and the characteristics of the premises it is being used in.
OUTPUT INPUT 3
R
L
In order for the feedback suppressor to work, it has to detect which of the microphone inputs is producing
GND LIFT AUX AUX
the effect, attenuating the gain level of that input to the exact point in which the microphone is coupling and
the feedback suppressor has to be activated using the buttons.
If acoustic feedback is not detected, activating the feedback suppressor is not necessary, as the system
response will be unnecessarily weakened at high frequencies.
ADJUSTING THE FEEDBACK PARAMETERS
It is possible to adjust the feedback suppressor parameters with greater precision. To access the two
adjustment potentiometers it is necessary to unscrew the lid removing the screws on the top and sides of
the system.
Once open, on the right-hand side of the rear part you will find two yellow square potentiometers, as shown
in the image below, which let you adjust the sensitivity of the inputs and the signal displacement speed.
To make these adjustments, use a crosshead screwdriver. By moving the adjustment anti-clockwise the
sensitivity and speed increase. By turning it clockwise, they decrease.
OUTPUT INPUT 2 INPUT 1
SR-1590
FEEDBACK SUPRESSOR
~230/115 V AC, 50/60 Hz,
FUSE: F1AL 250 V
LINE MIC LINE MIC POWER CONSUMPTION: 12 W
MIXER
OUTPUT INPUT 2 INPUT 1
SR-1590
FEEDBACK SUPRESSOR
~230/115 V AC, 50/60 Hz,
FUSE: F1AL 250 V
LINE MIC LINE MIC POWER CONSUMPTION: 12 W
AMPLIFIER
AMP IN PREOUT
RETURN SEND
OUTPUT INPUT 3
R
L
GND LIFT AUX AUX
LINE OUT
OUTPUT INPUT 3
R
L
GND LIFT AUX AUX
- 3 -
MIXER
OUTPUT INPUT 2 INPUT 1
SR-1590
FEEDBACK SUPRESSOR
LINE MIC LINE MIC POWER CONSUMPTION: 12 W
POWER AMPLIFIERS
MIXER
OUTPUT INPUT 2 INPUT 1
SR-1590
FEEDBACK SUPRESSOR
LINE MIC LINE MIC POWER CONSUMPTION: 12 W
EN
~230/115 V AC, 50/60 Hz,
FUSE: F1AL 250 V
~230/115 V AC, 50/60 Hz,
FUSE: F1AL 250 V