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Operating Instructions
Stereo Audio Noise Filter with 3.5 mm Jack
Item No. 2159538
Intended Use
The product is a passive stereo audio noise filter which reduces ground loop interference
(noise) within an audio system. It can be integrated into new or existing systems and does not
affect audio signal quality. It is compatible with all audio components and is ideal for multiple
amplifier setups where there is an audible speaker hum. The device connects via 3.5 mm input/
output and does not require an external power supply.
It is intended for indoor use only. Do not use it outdoors. Contact with moisture, e.g. in
bathrooms, must be avoided under all circumstances.
For safety and approval purposes, you must not rebuild and/or modify this product. If you use
the product for purposes other than those described above, the product may be damaged. In
addition, improper use can result in or other hazards. Read the instructions carefully and store
them in a safe place. Make this product available to third parties only together with its operating
instructions.
This product complies with the statutory national and European requirements. All company
names and product names are trademarks of their respective owners. All rights reserved.
Delivery Content
• Noise filter
• Operating instructions
Up-to-Date Operating Instructions
Download the latest operating instructions at www.conrad.com/downloads or
scan the QR code shown. Follow the instructions on the website.
Explanation of Symbols
The symbol with the lightning in the triangle is used if there is a risk to your health,
e.g. due to an electric shock.
The symbol with the exclamation mark in the triangle is used to indicate important
information in these operating instructions. Always read this information carefully.
The arrow symbol indicates special information and advice on operation.
Safety Instructions
Read the operating instructions carefully and especially observe the safety
information. If you do not follow the safety instructions and information
on proper handling in this manual, we assume no liability for any resulting
personal injury or damage to property. Such cases will invalidate the warranty/
guarantee.
a) General Information
• The device is not a toy. Keep it out of the reach of children and pets.
• Do not leave packaging material lying around carelessly. This may become
dangerous playing material for children.
• Protect the appliance from extreme temperatures, direct sunlight, strong jolts, high
humidity, moisture, flammable gases, steam and solvents.
• Do not place the product under any mechanical stress.
• If it is no longer possible to operate the product safely, take it out of operation and
protect it from any accidental use. Safe operation can no longer be guaranteed
if the product:
- is visibly damaged,
- is no longer working properly,
- has been stored for extended periods in poor ambient conditions or
- has been subjected to any serious transport-related stresses.
• Please handle the product carefully. Jolts, impacts or a fall even from a low height
can damage the product.
• Consult an expert when in doubt about the operation, safety or connection of the
appliance.
• Maintenance, modifications and repairs must only be completed by a technician
or an authorised repair centre.
• If you have questions which remain unanswered by these operating instructions,
contact our technical support service or other technical personnel.
b) Connected devices
• Also observe the safety and operating instructions of any other devices which are
connected to the product.
All manuals and user guides at all-guides.com
Operating Elements
Setup and Connection
a) Connection Diagram
b) Connection
• Turn the power to all connected devices off.
• Connect the noise filter between your source and output devices in the direction shown in
• Turn the power to all connected devices back on.
Care and Cleaning
• The product is maintenance free, disconnect the product before each cleaning.
• Do not use any aggressive cleaning agents, rubbing alcohol or other chemical solutions as
• Clean the product with a dry, fibre-free cloth.
Disposal
Technical Data
Audio input / output ....................... ø3.5 mm socket / jack
Audio input impedance ................. 600 Ω, 12.3 Vrms
Audio bandwidth ........................... 20 - 20 kHz (-3 dB)
Cable extension(s) ........................ max. 100 m (total)
Insert loss ..................................... 1 kHz, 0 dBm
Return loss ................................... Ref 600 Ohm: 300 Hz= 20 dB Min.,
Frequency response ..................... Ref 600 Ohm:
Turn ratio ...................................... 18 kHz, 1 Vrms
Operating conditions ..................... 0 to +55 ºC, 5 – 95 % RH (non-condensing)
Storage conditions ........................ -20 to +85 ºC, 5 – 95 % RH (non-condensing)
Cable ............................................ 2x 254 mm (including plug)
Dimensions (W x H x D) ............... 46 x 29 x 25 mm
Weight .......................................... 50 g
1
Place the device on a flat, level surface. The base may leave marks or scratches on
sensitive surfaces.
Computer
Input socket (1)
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Power socket
the above "Connection Diagram".
- The audio source e.g. laptop output, should connect to the input socket (1).
- The output jack (2) should connect to the output device e.g. stereo amplifier input.
To prevent signal loss, the total length of extension cables (not included ) should be
≤100 m (≤50 m at both ends).
they can cause damage to the housing and malfunctioning.
Electronic devices are recyclable waste and must not be disposed of in the
household waste. At the end of its service life, dispose of the product in accordance
with applicable regulatory guidelines. You thus fulfill your statutory obligations and
contribute to the protection of the environment.
1 kHz =22 dB Min., 4 kHz = 22 dB Min.
300 Hz = +/-0.35 dB,
4 kHz = +/-0.35 dB
This is a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1, D-92240 Hirschau (www.conrad.com). All rights
including translation reserved. Reproduction by any method, e.g. photocopy, microfilming, or the capture in electronic data
processing systems require the prior written approval by the editor. Reprinting, also in part, is prohibited. This publication
represent the technical status at the time of printing.
Copyright 2020 by Conrad Electronic SE.
1 Input socket
2 Output jack
2
Stereo audio
Noise filter
Output jack (2)
Power socket
*2159538_v2_0220_02_dh_m_en
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