Cutting File size through muxing HD Audio

[Mastablastacious]

What is the best way to get good muxed audio when doing multiplexing? I have found a way to change the audio bitrate in x264 .mkv's in an attempt to take about another 200 mb off of a movie file I am trying to edit to burn to disk. I have the options of the following ...





I tried muxing one to WMA Audio ENcoder codec at 8000hz coming from a whopping 48000hz in the first recording.. I dropped 1.2 gigs in file size havent tested audio quality difference yet but off those codes what would you reccomend or do you have any tips I only want to take off about 2-300 megs and keep the great audio so I can fit on a disk I already cut out 400 megs of video I cant cut anymore video any ideas? Basically I want to keep high quality audio and just take off a couple hundred megs is there anyway to keep it at 6 channels too? I only see 2 channel options in my muxer... I have already cut all the video and cant cut anymore vid so this seems a better option then converting the vid anymore.. any help?[/list]

[Mastablastacious]

I did a Mainconcept (Adobe2) version the audio sounds great... However.. only 2 channels any suggestions?? do current hardware now adays emulate 2 channel to 6.1 or 7.1 fairly well or is there a big dif in 2 - 6 channel encoding....