FONESTAR SR-1602 User manual

SR-1602
FEEDBACK SUPPRESSOR
EN Instruction manual

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We take this opportunity to thank you for buying this product.
We recommend you read the instruction manual before switching on the machine and follow the instructions
that are given. Keep the manual for future reference.
SECURITY AND T E ENVIRONMENT
ELECTRICAL SECURITY
Check that the current in the mains connection where the machine is to be installed corresponds to the
power supply of the machine.
To avoid damaging the equipment, electrical shocks, fire or physical injury when you connect or disconnect
the equipment from the power supply, pull the plug firmly out of the mains socket holding the plug, never the
cable.
Always do this with dry hands.
Keep the power supply cable far from sources of heat. Do not put heavy objects on top of it or change it.
Clean dust and dirt off the power supply cable regularly.
Do not open the machine; you could get an electric shock.
CAUTION
While installing the machine, make sure it is switched off and unplugged.
Do not open the machine. Touching the internal parts is dangerous and you could receive an electric shock.
The machine must not be splashed or dripped on. Never place recipients with liquid inside on the machine.
Do not place anything inside the machine.
LOCATION
Place the equipment on a horizontal surface with enough space around it to allow ventilation.
Avoid direct sunlight, heat sources and excessive dust.
Do not place the machine near magnetic fields or static electricity.
Do not use surfaces which vibrate or receive impact.
Do not pile machines on top of one another.
VENTILATION
Never block or cover the ventilation slits on the machine.
Do not expose it to direct sunlight or place it near sources of heat.
PERIODS OF INACTIVITY
When the machine is not going to be used for a long period of time, disconnect it from the mains.
If you are using an adapter, take into account that it will continue using electricity even if the machine is
switched off. If it is not going to be used for a long period of time, disconnect it from the mains.
T E ENVIRONMENT
To save energy, switch the machine off when you are not going to use it for a long time. The machine could
contain substances that are harmful to the environment or human health. To minimize the effect of these
substances the machine must be correctly managed and recycled when you decide to dispose of it.
When you dispose of it remember: it cannot be thrown into a conventional rubbish bin.
If it contains or uses batteries, these must be disposed of separately.
The machine (without batteries) must be disposed of correctly. Put it in a container specially intended for the
collection of electronic and electrical appliances, at the dump or hand it over to the dealer when you purchase
similar equipment, so that the dealer can dispose of it correctly (at no added cost).

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SIGNIFICANCE OF THE SYMBOLS ON THE MACHINE*
The symbol formed by the expression “Class 1 laser product” written in a rectangle
indicates that visible or invisible laser radiation could be produced. Avoid direct exposure
to the laser.
The symbol formed by a ray of lightening inside a triangle shows that the machine has
connection terminals or a circuit with areas with a current which could cause an electric
shock, even in normal working conditions.
The symbol formed by an exclamation mark in a triangle shows that the instruction manual
must be referred to for information on how the machine works and its use.
The symbol formed by one square inside another square shows that the machine has
double electrical insulation.
The European Community symbol shows that the machine complies with the current
European Union legislation, as well as its transposition to local legislation.
The symbol of a rubbish bin crossed out and over a horizontal line shows that when the
product is disposed of it must be done properly, placing it in a special selective electronic
and electrical equipment container or through a dealer when purchasing a similar product,
at no additional cost. It also shows that the machine was put on the market after 13th
August 2005 (European Community Directive 2002/96/CE of Electrical and Electronic
recycling, and its Spanish equivalent R.D.208/2005).
In accordance with what is set out in the aforementioned decree, FONESTAR is registered
in the RAEE (Registro de Aparatos Eléctricos y Electrónicos) in a special section REI
(Registro de establecimientos Industriales), with the entry number 001851.
The symbol Ro S (Restriction of azardous Substances) shows that the product has
been designed and manufactured restricting the use of certain dangerous materials
(Directive 2002/95/CE on the restriction of certain dangerous substances in electrical
and electronic appliances, and its transferal to the Spanish regulations, R.D.208/2005).
*It is possible that some of these symbols do not appear on the machine.
EXEMPTION OF LIABILITY
The characteristics of the equipment and the content of the manual can change without forewarning.
FONESTAR, S.A. does not assume responsibilities regarding the inappropriate use of the equipment or the
information supplied in this instruction manual, and specifically disclaims any implied liability for marketability
or fitness for any other use.
All rights reserved by FONESTAR, S.A.
DESCRIPTION
- Feedback suppressor.
- 12 adaptive notch filters per channel.
- 15 sensitivity levels and bypass.
- Fixed or variable filter parameters and attenuation.
- Stereo microphone input with phantom or line power supply.
- Input and output gain control.
- Stereo or mono mode.

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CONTROLS AND F NCTIONS
FRONT PANEL
1.- INP T LEVEL: gain control of the input signal.
2.- PROCESS ON-OFF: switch to activate or deactivate audio signal processing in order to suppress
feedback.
3.- O TP T LEVEL: gain control of the output level.
4.- MIC IN-LINE IN: input, line or microphone signal level selector.
5.- PHANTOM: 48 V phantom power supply selector for condenser microphones.
6.- L, R: LED input signal level indicators. To have a suitable signal/noise ratio and to optimize the
processing and detection of sound feedback, regulate the input gain control so that the input signal
level is approximately -6 dBu.
7.- CLIP: LED input signal distortion indicator. When the LED indicator lights up, it shows that processor
input is saturated. In this case, lower the input signal gain level.
8.- MONO/STEREO: mono or stereo mode selector. In mono mode feedback is detected in the left channel.
In stereo mode it is detected in both channels.
9.- LOCK: LED indicator of the filter parameter update mode.
PF/LPF: button to choose parametric notch filter update mode.
Press once, the LED LOCK indicator will light up and activate the PF mode ( old Parametric Filters).
Once the last notch filter has been adjusted, the filter parameters are fixed and feedback detection is
stopped. In this case the ATTENUATION control has no effect.
Press the button again, the LED LOCK indicator will switch off and the UPF mode (Update parametric
filters) is activated. After the last notch filter being inserted detection continues and if necessary the
previously inserted filters are reused. In this case the ATTENUATION control has affects the filters.
10.- SENSITIVITY: feedback detection sensitivity can be adjusted with the sensitivity selector from the MIN
to the MAX position through 15 sensitivity levels.
In the RESET/STOP position all the notch filters are reset and feedback detection is stopped, at the
same time as the LED LOCK and ATTENUATION indicators start blinking.
11.- ATTEN ATION: notch filter attenuation update mode LED indicator.
MPF/RPF: button to choose parametric notch filter attenuation update mode. Press it once, the LED
indicator will light up and activate the RPF (Release Parametric Filter) mode. The system will
progressively reduce, and could even deactivate, the attenuation of the active notch filters if they are not
necessary. If new feedback is produced, the attenuation of the filters will increase again.
Pressing the button again, the LED ATTENUATION indicator will turn off and will activate the MPF
(Maintain Parametric Filter) mode. Therefore the filter attenuation stays fixed once adjusted.
12.- LED power indicator.
13.- POWER: on/off switch.

PANEL POSTERIOR
1.- AC power supply socket: to connect the 230 V AC power supply cable included.
2.- O TP TS: audio signal outputs. Balanced auxiliary line output signal, XLR and 6.3 mm stereo jack
connectors. 2 V maximum.
3.- INP TS: microphone or balanced line inputs, XLR and 6.3 mm stereo jack connectors. Accepts
balanced, unbalanced and balanced electret condenser microphone signals with 48 V selectable
phantom power supply and different level line signals.
INSTR CTIONS FOR SE
- The SR-1602 is a feedback suppressor based on the processing and analysis of content in the frequency
of the input audio signal and the elimination of components in the frequency, which produce the feedback
or link effect, through 12 high precision parametric notch filters per channel.
- The notch filter parameters are saved in the memory and are restored the next time the feedback
suppressor is used.
- The system does not need an initial setting.
- The feedback suppressor has 15 pre-set sensitivity levels, allowing the feedback detection sensitivity to be
increased or reduced.
- Follow the steps below for a correct system operation:
1.- Switch the system on.
2.- Depending on the input signal characteristics choose the suitable position on the MIC IN/LINE IN
control: MIC IN if it is a microphone signal or LINE IN if it is a line signal. If you have connected a
microphone which needs phantom power supply, activate it with the PHANTOM control.
3.- With the INP T LEVEL control, adjust the input signal level so that in the L and R level LED
indicator the signal is around -6 dBu. This is the optimum level to achieve a good sound/noise
ratio and optimum feedback detection.
Adjust the output signal level with the O TP T LEVEL control depending on the signal level required
by the mixer or power amp where the feedback suppressor is to be connected.
The LED CLIP indicator should not light up. If it lights up, the signal is distorted and the input signal
level must be reduced with the INP T LEVEL control.
With the MONO/STEREO control you can choose whether the feedback detection is going to take
place only in the left channel, mono position, or in both channels, stereo position.
4.- To process the signal and delete sound feedback, the ON position must be chosen on the PROCESS
control.
In the OFF position the input signal is sent to the output in bypass and the processing does not take
place.
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Activating and deactivating this control, you can easily check if the feedback suppressor is deleting
feedback.
5.- You can choose the feedback detection sensitivity with the SENSITIVITY control wheel. There are 15
sensitivity levels. You can choose the best one for your needs. To start with it is best to choose an
intermediate position.
The RESET STOP position stops the feedback detection process and resets and restarts all the notch
filters. The LED LOCK and ATTEN ATION indicators will blink.
6.- The LOCK control (HPF/ PF) lets you select the update mode for the notch filter parameters.
With the LED LOCK indicator on the feedback suppressor is in HPF (Hold Parametric Filters) mode.
In this case the 12 notch filters per channel are estimated, adjusted once, fixed and then stop feedback
detection. The ATTEN ATION control adjustments have no effect. This mode can be used when the
microphones are in a fixed location.
If the LED LOCK indicator is switched off, the feedback suppressor is in PF (pdate Parametric
Filters) mode. The 12 notch filters per channel are set at the beginning and feedback detection continues
so that the notch filters are reset and reused if necessary. In this case the ATTEN ATION control
adjustments do have an effect. This mode can be used with microphones which are not in one fixed
location.
7.- The ATTEN ATION (MPF/RPF) control chooses the notch filters attenuation updating mode. This
control only has any effect when the UPF function is activated and the LED LOCK indicator is off.
When the LED ATTEN ATION indicator is on, the RPF (Release Parametric Filter) mode has been
chosen. In this case the feedback suppressor gradually reduces the filter attenuation if it is not necessary,
removing the attenuation completely after a certain amount of time. If new feedback is produced, the
filter attenuation will be increased again.
With the LED ATTEN ATION indicator off, the MPF (Maintain Parametric Filter) operating mode is
chosen. This is where the notch filter attenuation is fixed.

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BLOCK DIAGRAM
CONNECTION
The feedback suppressor SR-1602 can be incorporated into a P.A. system in many ways thanks to its
accepting microphone or line signals and that it has phantom power supply available.
Example of a microphone connection to the SR-1602 input

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Example connection of the SR-1602 between the mixer and the power amp
SPECIFICATIONS
SR-1602
CHARACTERISTICS Feedback suppressor.
12 adaptive notch filters per channel.
15 sensitivity and bypass levels.
Parameters and attenuation of fixed or variable filters.
Stereo microphone input with phantom or line power supply.
Input and output gain control.
Stereo or mono mode.
RESPONSE 20-20 000 z ±0.5 dB
DISTORTION armonic: < 0.01 % (-6 dB, bypass)
S/N RATIO > 90 dB (A weighting, bypass)
A/D, D/A RESOL TION 20 bit
PROCESSED RESOL TION 24 x 32 bit
INP TS 2 balanced mics./lines, XLR and 6.3 mm stereo jack 2 V maximum, switchable
O TP TS 2 balanced auxiliary lines, XLR and 6.3 mm stereo jack 2 V maximum
PHANTOM 48 V, selectable
POWER S PPLY 230 V AC, 10 W maximum
DIMENSIONS 482 x 44.5 x 165 mm depth. 1 x 19" U rack
WEIGHT 2.4 kg
OPTIONAL FRP-41G: control panel cover with window

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DECLARATION OF CONFORMITY
The feedback suppressor model SR-1602 complies with the European Community Directives
2004/108/EC on Electromagnetic Compatibility and 2006/95/EC on Low Voltage.
Santander, 16th September 2010
Juan Vallejo
Technical Engineer, Sales Department
WARRANTY
This product has been tested and has passed the corresponding quality control prior to being put on the market.
FONESTAR guarantees the suitability of the product for its specified use during a period of 2 years from the delivery date
and commits itself to repair or substitute the goods as expressed in the Spanish law ‘La Ley General para la Defensa de los
Consumidores y Usuarios, Real Decreto Legislativo 1/2007 16 Noviembre.
The lack of conformity in the first six months after purchase, due to a manufacturing defect, will be rectified with no more
than showing the proof of purchase. After six months FONESTAR reserves the right to demand proof of the product being
sold with that problem.
This warranty does not include damage produced by: inappropriate use or negligence, accidents, worn out parts due to use,
breakages, burns, spilt liquids or other substances, excessive humidity, battery deterioration and internal manipulation of the
device, the software or its components by unauthorized persons, and in general any use that is unrelated to the nature and
purpose of the product.
If any service is needed during the warranty period because of lack of conformity, please contact the business or distributor
where the product was purchased in no more than 2 months after being conscious of the problem. It is only necessary to
contact FONESTAR if it is impossible or imposes an undue burden for them to solve it.
To benefit from this warranty it is necessary to show the proof of purchase with the date clearly visible, with no corrections or
crossing out.
This document adds information, and never decreases the consumers’ rights, which in all cases are protected by the Spanish
law ‘La Ley General para la Defensa de los Consumidores y Usuarios, Real Decreto Legislativo 1/2007 16 Noviembre’.
w
FONESTAR is a member of ECOEMBALAJES ESPAÑA, S.A. “ECOEMBES”, with number 03497 and all our
products carry the symbol, backed by our membership and subscription to the above mentioned organization
ith the recycling and subsequent management of our packaging.
FONESTAR S.A. - NIF A28780443 - Apartado 191 - 39080 - Santander, Cantabria, (España)
www.fonestar.com