Ah, I see that the Supported Formats tab is absent.
That is because his PC is connected to his Onyx speaker via a 3.5 mm jack, which is an analogue output. The "Supported Formats" tab only appears for digital outputs, as far as I know.
However, as per my image in Reply #23, if you open the Advanced tab and show the drop-down list, it should show what formats are supported, and therefore available to Direct Sound in Shared Mode, or to WASAPI in Exclusive Mode.
FurnitureFence, in Replay #28 where you showed the properties for the Onyx Speaker, Windows thinks you have Onyx headphones connected, and I think you have said previously that you also have Onyx Headphones. Stuff like that just adds to the confusion. Windows 10 doesn't make it any easier, with the way Audio has been rearranged in settings.
Can I assume that only the Onyx speaker is connected and that properties image refers to the Onyx Speaker? No headphones involved?
Fortunately, in Reply #28 you show MC is actually set to use the Onyx (Speaker/Headphone) as the target audio hardware, using the "High Definition Audio Device" driver. So your setup is just like my Workstation that targets "Speakers" as the audio hardware, using the "Realtek High Definition Audio" driver.
Can you post an image showing the contents of the Advanced tab drop-down list, please? For both the "ONYX (High Definition Audio Device)" and the "LAPTOP (High Definition Audio Device)".BTW, I looked up your "Harman Kardon ONYX Studio 2" speaker again, and found a FAQ article that said the Bluetooth Audio always takes precedence over the AUX Input (3.5mm jack). So if the Onyx is receiving any signal over BT, it will be set to play the digital signal, and use a maximum Sample Rate of 48 KHz. This shouldn't matter for the analogue input via the AUX Input 3.5mm jack, but maybe it does. My cheap analogue PC speakers can play 24 bit / 192 KHz audio, so the Onyx should also be able to play that. But who knows what the internal circuitry of the Onyx is doing? Can Bluetooth be switched off on the Onyx Speaker?
Also BTW, you should be using the "ONYX (High Definition Audio Device) [WASAPI]" audio device in MC. If the Onyx truly doesn't support Sample Rate above 48 KHz, then the MC Output Format should be restricted to 48 KHz, as per the attached image, and then all formats will play. Of course, you will only get 48 KHz audio, and your 24-176 SACD's will be downmixed to 48 KHz...
No, your SACD's have never played at 176 KHz, because you were using Direct Sound, which down-mixed them to 48 KHz without you knowing it.If you want to see what MC is actually playing, use the Audio Path feature in MC. But that will only show what MC is outputting. If you use Direct Sound, Windows will down-mix your audio so that it can be played.