https://community.sony.co.uk/t5/camcorders/fdr-ax100e/m-p/1878393#M3595 <P>I'm not entirely sure, but I remember vaguely that 5.1 was only available when shooting AVCHD. With XAVC-S 4K, I guess there is no 5.1 option, only stereo.</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>EDIT: I found the following&nbsp;in the manual.</P> <P>&nbsp;</P> <P>Movie recording format:</P> <P>XAVC S (XAVC S format) Video: MPEG-4 AVC/H.264 Audio: MPEG-4 Linear PCM 2ch (48 kHz/16 bit)</P> <P>&nbsp;</P> <P>AVCHD (AVCHD format Ver.2.0 compatible) Video: MPEG-4 AVC/H.264 Audio: Dolby Digital 2ch/5.1ch Dolby Digital 5.1 Creator*1</P> <P>&nbsp;</P> <P>MP4 Video: MPEG-4 AVC/H.264 Audio: MPEG-4 AAC-LC 2ch *1 Manufactured under license from Dolby Laboratories.</P> Mon, 09 Feb 2015 12:24:25 GMT Portmixus 2015-02-09T12:24:25Z https://community.sony.co.uk/t5/camcorders/fdr-ax100e/m-p/1878330#M3594 <P>How do I change the sound recording from two (2)&nbsp;channel to five point one (5.1)</P> Mon, 09 Feb 2015 11:11:07 GMT https://community.sony.co.uk/t5/camcorders/fdr-ax100e/m-p/1878330#M3594 Derekpengwyn 2015-02-09T11:11:07Z https://community.sony.co.uk/t5/camcorders/fdr-ax100e/m-p/1878393#M3595 <P>I'm not entirely sure, but I remember vaguely that 5.1 was only available when shooting AVCHD. With XAVC-S 4K, I guess there is no 5.1 option, only stereo.</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>EDIT: I found the following&nbsp;in the manual.</P> <P>&nbsp;</P> <P>Movie recording format:</P> <P>XAVC S (XAVC S format) Video: MPEG-4 AVC/H.264 Audio: MPEG-4 Linear PCM 2ch (48 kHz/16 bit)</P> <P>&nbsp;</P> <P>AVCHD (AVCHD format Ver.2.0 compatible) Video: MPEG-4 AVC/H.264 Audio: Dolby Digital 2ch/5.1ch Dolby Digital 5.1 Creator*1</P> <P>&nbsp;</P> <P>MP4 Video: MPEG-4 AVC/H.264 Audio: MPEG-4 AAC-LC 2ch *1 Manufactured under license from Dolby Laboratories.</P> Mon, 09 Feb 2015 12:24:25 GMT https://community.sony.co.uk/t5/camcorders/fdr-ax100e/m-p/1878393#M3595 Portmixus 2015-02-09T12:24:25Z