Connecting Beolab 12-2 to pre-out receiver.

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L1NO Posted: Fri, May 2 2014 9:03 PM

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Dear all,

I've found it hard to connect my Beolab 12-2 in the bedroom to my Yamaha receiver.
As a start i have build a mini-jack to RJ45 and this works fine. (Extremely low hiss)

Now i'm trying to connect the beolab's to the pre-outs of my receiver. At any attempt i get an enormous humm.
The second try was using a RCA cable connected to a wallmount -female RJ45 dock. And using a RJ45 cat6 to the speaker itself. 

The cat6 cable alone gives no hiss, connected to the dock gives little difference. When i connect the receiver > RCA > DOCK > RJ45 > CAT6 > Beolab is where get enormous hiss.

Obviously the receiver is to blame, but what to check or fix?

Fun-Fact, the receiver is connected to an Sony NX720 series and are controlled by an Arduino which is in turn controlled by a Beo4. (Also does RF commands for light).
All other sources where disconnected.  

Does anyone have a proper pin-out diagram?