DTS-HD MA supported on latest ATV Flash Black?

Hi. A friend of mine has an ATV2 with latest ATV Flash Black and we were trying to watch a movie .mkv with DTS MA but the media player just output regular DTS to the receiver via HDMI. Also the media player was using only the 5.1 channels and the mediainfo for the file contains also the 7.1 track. Below the audio section of the mediainfo.

 

Any suggestion? We didn’t have a different file for testing.

 

Audio

ID                                       : 1

Format                                   : DTS

Format/Info                              : Digital Theater Systems

Format profile                           : MA / Core

Muxing mode                              : Header stripping

Codec ID                                 : A_DTS

Duration                                 : 2h 22mn

Bit rate mode                            : Variable

Bit rate                                 : 3 949 Kbps / 1 510 Kbps

Channel(s)                               : 8 channels / 6 channels

Channel positions                        : Front: L C R, Side: L R, Back: L R, LFE / Front: L C R, Side: L R, LFE

Sampling rate                            : 48.0 KHz

Bit depth                                : 24 bits

Compression mode                         : Lossless / Lossy

Default                                  : Yes

Forced                                   : No

Unfortunately the Apple TV hardware is limited to 16-bit audio output. Sorry.