Choosing sampling rate with Blu Ray Audio discs

[BruceB]

I have a 2-channel audio system, two older Sony Blu Ray players, and am a newbie when it comes to Blu Ray Audio. I recently bought my first Blu Ray audio disc, and beside Dolby Atmos etc it has a separate 2-channel 24 bit/ 192kHz audio version on it. I have the PCM output of the Blu Ray players connected to a DAC which is spec'd as 32-bit 192kHz. When I play the disc, whether it is the toslink or the coaxial output of the player, I get 48kHz sampling rate out according to my DAC. I realize that for audio playback purposes 48kHz sampling as probably all I need, but it leads me to ask these two questions: 1) Which piece of gear is downsampling the data stream to 48kHz and why? 2) How do I get a higher rate (96kHz or 192kHz) from player to DAC, since the disc has it and the DAC supposedly can handle it?

 

[JStewart]

Welcome to the forum!
It’s probably the Sony blueray, but a check of the owners manual should provide a firm answer and also if a higher sample rate is possible without using HDMI.