After trying a lot i found out how to stream best quality to my onkyo trx 309 with 2 seconds delay. Install first SWHY and set it up to PCM 44.1, so the reciever has just to pass trough without decoding. Connect it with your DLNA client – here a SmartTV and your done!
For movies i just use HDMI Cable with ffdshow works like a charm. I can recommend fidedify with wasapi for spotify, if your connected via HDMI. Its a great improvement!
I love spotify!