Block diagram shows the two Powerlink outputs are simply wired in parallel on the BS9000.  So noise generated by a faulty speaker *might* propagate to the other cable, regardless of whether they are daisy-chained or not -- it's just a dumb bus, not separate output drivers.  Start by disconnecting the aftermarket MK.2 (thick, 8-wire) cable and set it aside.  Then test: Run the BS9000 with just one BL3 at a time, and use the MK.3 (thin, 4-wire incl. ground/shield) cable for that single speaker.  You'll quickly discover if one speaker is whining, or the BS9000 is.  Don't forget to try both channels with each single speaker, using the L/R switch.

(N.B. I have never personally experienced a high-pitched whine, only the well-known click&buzz when the volume control was pressed, from using 8-wire cables.)

[Edit: You might also try plugging in headphones and see if your whine sounds on them.  Not sure what that result would mean, but someone else will know.]

Thank you for your replies. The results of my tests are not encouraging:

I tried each PowerLink cable on its own and between the two PowerLink ports. I also used headphones through the minijack at the bottom.

With headphones everything sounds normal. The high pitched tone remains and the digital chirp only seems to be in the left most PowerLink port.

I should mention that this equipment came with me from Europe, so its all 220V running on step up voltage convertors. I've even tried these in different outlets and plugged them into noise suppressing surge protectors.

It sounds like the 9000 needs to go back unless this is a common problem with 220V B&O equipment on voltage boosters?

If the problem is only in one of the PL outputs - you wrote ‘the left most PowerLink port’ - you could try to use a powerlink splitter from the other one.

MM

Hi everybody

I do have the same problem with a pair of Beolab 3 newly connected to a Beosound 9000 by using propper MK3-cables. Should I look on the BS9000 side or on Beolab 3?