A late comer here.
I got the BX370 from Costco last week, I think it's the same or almost identical to the S3700 in other retails.
Anyway, I hope someone can verify this for me before I return it.
Is it true that it doesn't support TrueHD audio format when playing via USB?
I have an .mkv with TrueHD format, and I cannot play it, it indicates "audio format not supported", I cannot even play other audio track.
I've searched around and it seems it should but it won't work for me.
Not sure if Sony product really not support TrueHD or just a firmware bug (I've updated to the latest firmware, R30.xx380)
Note: it plays DTS-HD MA .mkv file just fine.