Fix Hum Noise in Beolab – CAT7, RJ45 & Grounding Guide

Are you experiencing a hum or interference in your Beolab speakers? This problem often occurs in installations with CAT7 cabling and RJ45 connectors. Fortunately, in most cases, this is easy to resolve. On this page, we explain where the hum comes from and how to prevent it. Where does the hum come from?

The cause is usually poor or missing grounding.
At Bang & Olufsen cables such as:
Powerlink
Masterlink
the shielding (jacket) is used as ground.
In CAT7 installations in homes, this often goes wrong:
Only the 8 wires are connected
The shielding (ground) is not used
Wall sockets are often not grounded
Result: hum or noise in your speakers, look here wrong pictures
How do you solve this?
Use RJ45 connectors with metal shielding
Connect the ground (shielding) correctly
Use wall sockets with a connection for shielding
Ensure that the shielding makes contact with the connector
This prevents interference and ensures a stable audio signal

Download the NetworkLink Instruction from B&O for correct connections

Common mistakes
Ground cut off during installation
Cheap RJ45 connectors without shielding
No grounded wall sockets

Using the right solution?
View our cables and solutions:
Shielded Powerlink cables
RJ45 to DIN8 cables
Grounding solutions
Especially for B&O
“Which cable do I need”
“Connecting Beolab to TV”
“Connecting WiiM to Beolab”
"Daisy-Chaining"


Need help? Contact us via WhatsApp