6ch Ac3 to 2ch Ac3

Is there a guide on how to change 6ch to 2ch because I find with 6ch the background audio is louder than the speech somebody told me if you haven't got surround sound you need 2ch audio to avoid this. I've found Downmix and AC3 machine but I need a guide because I've got no idea how to use it. I'd be grateful if someone could help me out. Thanks alot. K401

'Channels Mode' 

there's an active link on AC3Machine to the relevant guide.

Thankyou DSPguru, for your help, but I've got a probelm in AC3 machine. When I get to Input of AC3 file I go to the film in the browser but it doesn't reconise the AC3 file. Any idea's. Thanks alot K401

Why bother using AC3 when there is MP3 & MP2? With MP3 you won't get over 160kbps if you encode in VBR mode and get nevertheless "perfect" quality (use r3mix or alt-preset) With MP2 stay over 192kbps (Stereo, *NOT* Joint Stereo) and all will be fine!

my advice would be : either you do 5.1ac3 -> 5.1ac3 with lower bitrate either you go for 5.1ac3 -> 2.0 ogg vorbis.

iago thankyou for your help. I converted the AC3 to MP2 and Spruce wouldn't except it. Can you give me any idea's where I'm going wrong. Thanks alot K401

I think I've made a mistake I converted to MP2 and I read you posting again and it's MP3. Will Spruce except MP3? Thanks alot K401

np, Matt. btw, Stereo mode is still more advised than Dual channel. Joint Stereo is mostly advised for mono streams ;). reminder : above is only relevant for mp2.

Well that was actually my problem too, I was thinking in terms of MP3. So now it's more testing I need to perform this weekend:)