I got Energy 5.1 Classic speakers. I have not bought a receiver yet,cause I am still researching, depending upon my HTPC configuration. There are 2 ways to get 5.1+ sound on the home theater from your pc:
1) Digitial SPDIF
2) Analog Wires out from your sound card to your receiver
In past, I have used on board realtek card's analog out ports to my home receiver (which I sold). Now I find out, I could get 5.1 correctly if I had correct sound card which encodes the sound in DDL or DTS format (asus xonar dx. Since in market, there are not many receivers which have enough multi-channel analog input, you have to be careful when selecting a receiver (if I go analog route). Question is, has someone tried (preferably one owing asus cards or similar that do encoding) both the analog output and digital spdif to their receiver? Was there a huge difference?