how do i get 96/24 audio?

took me three years to figure out that it was a setting on my dvd that
prevented me from getting dts audio from the 146.
i still am unable to unlock 96/24 audio.
i'm using 96/24 dvd-audo discs and the 146 flashes 48khz upon initial play of
such discs?
any suggestions are welcome.
thank you