Or use WISA Transmission for wireless integration?

Ralf

kallasr wrote:

Or use WISA Transmission for wireless integration?

Ralf

Quite possible if I buy two WISA receivers but since most people complains about how much problems WISA introduces I want to stay off that track for now. It would also add costs, boxes and more reliability issues to the setup.

I think it would be easier to replace the cable in the wall, but then I should probably replace all of them. I was a bit surprised that it seems to need shield but this might be a requirement to remove noise in the cable since the signal is analog I presume.

rob08 wrote:

I tried an unshielded cat6 between bv11 and Beolab 25 sub and it also made buzzing sounds. Got a shielded cat7 from dealer and no buzz. I guess it needs to be shielded.

Then it´s probably it. I´ll try a shielded cable before I change the cabling in the walls. The shielded cables are so much thicker and harder to pull through the walls. Especially when every pair of cables is shielded separately (as in CAT7). Some of them also has a plastic cross in the cable to keep the wires aligned and away from each other. They are thick and stiff like gardening hoses :D.

I would just get a couple of ferrite magnet coils that grip to over the cables before i run to get new cables just yet. But yes, the no shielding is most likely your problem. 

BeoMegaMan wrote:

I would just get a couple of ferrite magnet coils that grip to over the cables before i run to get new cables just yet. But yes, the no shielding is most likely your problem. 

I don't think ferrite magnet coils is a good way to solve it but I wonder if I might use a spare pin on the cable as ground perhaps? If there are any. 

As far as I can see there is only five pins utilized in PowerLink MK3 (ground as shield, left and right signals, power on signal, system mass (what)).

MK2 uses all eight pins but one of them is still shield. A Cat5/5e/6 cable etc has eight pins + possible shielding.

MK1 only uses ground (shield), signal left and right and switching voltage. 

Perhaps I could try to connect it all over pins only?  And anyone know what "system mass" is or "mass data line". MK2 has an additional data line which I suppose transmits the data for display on Pentas. A pity this can't be used with new systems.

By the way, does anyone have a pin out description of the Powerlink RJ45 ports on BeoVision Avant? I would need this to make a cable adaptor to move the shield to a pin.

Quoting a Wikipedia article regarding the ferrite cores: "If absolutely necessary, insert isolating transformers in problematic signal lines.". 

https://en.wikipedia.org/wiki/Ground_loop_(electricity)

it is a pity that shielded cables seems necessary for PL over CAT since they are so much more expensive and rarely used now except for in CAT7 installations. For example Cat6A is usually UTP due to the risks of grounding problems and electrical missmatches between different power sources.  

I think this is a very interesting issue. For one it is important to take into account that CAT-cables can have several kinds of shields. For example a braided shield or just a shield foil that differs quite a lot. Some uses a drain wire. Some has shields over every pair of pairs inside the cable. I would believe it would affect the sound in different ways since it could interfere with impedance etc. And cause different amounts of noise.