What Should My 5.1 Stereo Receiver Have NEED QUICK ANSWER!!! 5.1 To Stereo?

NEED QUICK ANSWER!!! 5.1 to stereo? - what should my 5.1 stereo receiver have

I want to create a stereo, and I wonder if I can only two speakers with a 5.1-use receivers. Is this loss of sound quality? I need a converter of some kind?