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What kind of files were you trying to play?

Axeman, I feel all your problems as well. The only difference is I am trying to get my 4350 to work with windows 7. I can get 5.1 pcm, but I can't get the dts or ac3 pass through to work. I really want to get my htpc to work with this soon.

mmmmmdonuts21 wrote:

Axeman, I feel all your problems as well. The only difference is I am trying to get my 4350 to work with windows 7. I can get 5.1 pcm, but I can't get the dts or ac3 pass through to work. I really want to get my htpc to work with this soon.

When I was using the 4550 with Win7 RC, I really needed to mess with ffdshow's settings to get that going. Once that is done the passthrough works. I don't have 5.1 LPCM material so I can't really test that, but the receiver defaults to 5.1 LPCM mode anyways and when I'm playing AC3 materials the DD sign lights up.

Still need to figure how to upmix all stereo stuff to 5.1 automagically though, but I'm happy with those H.264+AC3-in-MKV stuff.

Thanks for your help Flying Fox. While searching how to use ffdshow I stumbled upon this website: http://shark007.net/index.html

From there I then installed the 32bit package and then the 64 bit package. I changed three settings in the audio tab

1) Changed speakers from 2 channel to 5.1
2) checked set AC3 fliter to use spdif passthrough
3) clicked use passthrough under the ffdshow option area.

I recommend trying this option if your having problems. It was a beautiful sight seeing the red lights DD on my receiver light up. I did it on windows 7 x64.