It's normal  for BL4000 MK1 to have little hum :)

Ok, thank you. So changing cables would not help? Before I'm buying the local electronics store empty or bringing them back.

Hi Mick35,

Welcome to Beoworld!

The hum level on the speakers should be very quiet, ie. in a quiet room, you should not be able to hear the hum more than 50cm from the speakers.

Moving the speaker cables away from mains power cables is often an easy way to prevent humming through the speakers.  If the cables are professionally made versions with sealed 8 pin DIN plugs, then there won't be much to gain from replacing them on Beolab 4000 mk.1 speakers - however if they appear to have been "home-made" or damaged in any way then upgrading them to the correct cables can give improvements:-

Steve,

Thanks for your answer! There not much cables around the RCA cables I use. I’m using double shielded RCA cables. Tomorrow i’m home again and gonna do some tests from how far I can hear the humming. Is there a difference using din cables instead RCA?

Gr!

Hi,

For connection to a B&O system, please use DIN cables, for connection to a non-B&O system, please use RCA cables with Beolab 4000 mk.1 speakers.

Please let me know how you get on!

Kind regards, Steve.

I would say a hum is not normal. Perhaps a very slight "white-noise" (like most speakers) when there is no audio playing, but not a hum. B&O or any speaker manufacturer would never be ok with releasing a product whereby they intend for customers to have to put up with a hum as part and parcel of owning the speaker.

Hi Howzit,

I would agree with you that when the speakers were new, they should not hum.  However, with the earliest Beolab 4000 mk.1 speakers now being over 20 years old, I would expect a small amount of hum to present due to degradation of components inside the amplifier.  However, this should be a very low level and it should not be intrusive during normal listening.

Kind regards, Steve.