Ground loop isolator – Beolab speakers & B&O devices (no guaranteed noise-free effect)

We often receive questions about hum noise in Beolab speakers when using CAT7 cables installed inside walls. These are commonly used with RJ45 to DIN8 (Powerlink) connections, but may result in unwanted noise.

The main cause is usually missing or incorrect grounding. Both Powerlink and Masterlink cables from Bang & Olufsen include shielding where the metal outer layer is used for grounding.

In many installations, CAT7 cables are connected using only the 8 internal wires, while the shielding/ground wire is not connected. Additionally, standard wall outlets are often not grounded, leading to interference.

For proper operation, it is essential to:

Connect the cable shielding (ground)
Use shielded RJ45 connectors
Secure the shielding to the metal clamps (strain relief) in wall outlets

Following proper grounding, as described in B&O Network Link documentation, will eliminate hum and ensure clean, interference-free audio.

If you suffer from Brom, connect this Isolator between the Tulip (RCA) wiring.

Simple and easy, disconnect the tulip cable from TV or sonos / amplifier and connect this isolator, then connect the cables to the isolator and the hum is gone.

Connection, 2 x tulip (left / right) 2 x female tulip (left / right) (no power needed)

Earth loop Insulator for connection of Minijack,

If you have noise from hum on your mini connection jack, this insulator can solve the problem.