DTS Transcode to DD

Hi,

please correct me if i’m wrong.

In the audio settings i have selected:
Number of Channels: 2.0
Passthrough: On
AC3: Yes
AC3 Transcoding: Yes
DTS: No

To me, this means that all DTS Tracks are first decoded to PCM, and then encoded again to DD, correct?

In my case, i have a weird issue in that if i do this, any AC3 or even DTS file will get 5.1 surround sound, but the center channel is missing the subwoofer support.
Is this something that can be changed somehow in the advanced settings? Is this usually happening, or is this only because of my Samsung Soundbar?