Why FCP X cannot import 5.1 channel audio from AVCHD

I just bought a Sony PJ790 camcorder and it can record HD movie with 5.1 surround audio. When I connect the camcorder the the computer, indeed it shows 6 (5.1) channel under windows. However, when I tried to import the movie into FCP X, the channel count of FCP X only reported 2 channels. I was puzzled and keep importing. After I imported the movie, I actually only see 2 channels (left and right) .
Why FCP X only recognized 2 channels and how to correct this problem ?
Thanks in advance.

iMovie and FCPX both offer transcoding of AVCHD to an editing codec. In iMovie, it is transcoded to Apple Intermediate Codec. In Final Cut Pro X, AVCHD is transcoded to ProRes 422. In Final Cut Pro X, you have the option of editing natively in AVCHD, but most Pros will transcode to ProRes 422, because speed and quality of editing is more important to a Pro than saving on disk space. For why this transcoding is done, see this post. https://discussions.apple.com/docs/DOC-3941
Both iMovie and Final Cut Pro X also can do analysis for stabilization, analysis for rolling shutter, etc. FCPX can also analyze for color, sound problems, and maybe more.
With Final Cut Pro, the transcoding and analysis do not slow you down, because it can happen in the background. You can start editing immediately.
Also, you mentioned that you are converting m2ts files for use in iMovie using ClipWrap. iMovie and Final Cut Pro X both handle m2ts from Sony quite well with no need for an external converter. So I assume you must be shooting 60P, which iMovie does not do. FCPX will import 60P with no need for an external converter.
Final Cut Pro X has similarities to iMovie, but it is much more complex, because you have fine control over everything. In addition to the $300 price tag, you might want to also budget for some training. There are good video-based training resources from Ripple Training, Larry Jordan, and also some free Tutorials on YouTube. THere are also good books on FCPX. The best books I have found are these from Edgar Rothermich -
http://www.dingdingmusic.com/DingDing/Manuals.html

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"Hope this clarifies."
sorry it doesn't - it confuses me and I don't get why you want to do it this complicated way ;-)
1. If you have problems try to simplify your workflow. Why do you try to work with dynamic link in Encore? This isn't the classic route and I don't see why you need it in this case.
2. In a classical workflow you load final encoded audio and video files in Encore - in this case a .m4v and a .ac3 file encoded in Adobe Media Encoder.
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For all 5.1 clips Premiere will create a 5.1 audio track. For all stereo clips Premiere will create a stereo audio rack.
--> Keep in Mind you can't export a premiere audio track. That isn't possible even though this would be handy in a lot of situations. You alway only export the master audio track of a timeline. That master audio track get's it input from all audio tracks of a timeline. If there is a 5.1 audio track 6 channes are mixed to the master audio - if it's only a stereo track only L, R get's mixed up to the 5.1 master.
The master audio track is what you can hear if you play back a timeline.
4. Why do you want to convert stereo audio tracks into 5.1 audio tracks in the timeline? It needs much more filesize/ ram slows down your playback and gives you a unhandy viewing with lots of emty audio channels... Why dont store and view a stereo track as a stereo track?
5. If you have placed your stereo and 5.1 audio tracks on the timeline you can export the final mix via Adobe Media Encoder with the Surcode plugin as Dolby Digital 5.1 .ac3
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That doesn't make any sense... because Premiere does it automatically for you without Audition. You simply have to do nothing - just place your stereo clip on the timeline and ready.
If you want to use Audition you have to have a real reason for it - for example do extensive audio work and mastering Tasks - conform it to R128 loudness or something like that.
Does this make sense to you? ;-)

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Thanks for the reply.
The link to your prior thread is
Audio
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I hope that makes sense. When you change the number of audio outputs as described in the first step, I believe the rest of it is fairly self explanatory, once you know where the settings are.

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Why FCP X cannot import 5.1 channel audio from AVCHD

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