Thanks Keith I'll try this tonight.   When you say that I may have an earthing issue do you mean with the house or the 9000? 

Ian,

Actually, it could be either, however given you previously told me that the Mark I had been upgraded and "serviced" also means its been taken apart and therefore it is possible for a signal ground somewhere not to be correctly connected, equally any problems with your power neutral line could gives these type of issues.

The bottomline is we need to do various tests to narrow the problem down.

Hi

Please confirm that it is mkIII power link cable by looking on the DIN plug in the plastic there is a triangle. if not is mkI😝

Well Ian,

Based on your answers, the following are my conclusions:-

• Whilst you have a static problem, it is nothing to do with your Humming noise issue.
• Given you have new Mark III powerlink cables and you have tested the speakers on another system it seemds unlikely to be the speakers at fault.
• Whilst your mains tester is not full proof because you could still have a voltage potential between neutral and earth, but it seems less likely to be the cause.
• The most likely cause now appears to be the Beosound 9000 itself, given the recent work which has been done on the unit by your dealer. I am assuming here that nothing else whatsoever is connected to the BS9000 other than the mains cable, and powerlink cables to the speakers ? please confirm.

I think you should take the BS9000 back to the dealer who did the upgrades and have them check it. It seems most likely that a earthing screen or wire have not been put back correctly..

I have the same problems with my Beosound 9000 and BL3´s.

I use two different cables to them:

1 P.L Mk1 which gives a noise tone like a radio without any station at the frequenze.

1 P.L MK3 Bossocom with this cable you get a high frequenze noise instead.

Anyone with a solution for this problem?

Another humming scenario involving my BS9000 and Penta's.

Both were fine using Mk3 cable for beolab speakers with displays.....changed one of them for an eBay purchased 20 metre cable.

All ok, no constant humm, but I do get annoying hum\buzz when adjusting volume or tracks change on the one Penta that I have extended.

Have now purchased 20 metre mk3 from Lifestyle that I hope allows me to extend and does not give me hum\buzz between tracks...

It is worth knowing that part of diagnostics i laid 20 metre cable in middle of floor - well away from any power sources etc...

Will let you know in case it is relevant,

Thanks

Russ

You should be using Mk2 fully wired cables for Beolab Penta!

The buzz/crackle when you change volume/tracks sounds like a duff contact problem in one of the plugs/sockets

Common issue

You need to cut one of the powerlinks wires, can be easily done by cutting one of the plugs pins.  Contact your local service centre to check the correct pin. This is in their config guide.