[Mark_A_W]

Originally Posted by tebasuna51

I never see the surround channels (5.1) at 90º, always was at 110º-120º.

Maybe Dolby change the setup to avoid the problem, but there are old ac3 material with surround channels calculated to 120º.

Change now the setup is a wrong solution, because perplexes users as you can see in your wellintentioned post.

I think a 5.1 must be played in a 7.1 system with:

Side speakers = 0.7 x Surround speakers
Back speakers = 0.7 x Surround speakers.

Yes, that's pretty close to what I did with the ffdshow mixer.

I didn't use 0.7, I used 1.0, but then turned the Xonar levels down, same result.