Vista bit / sample rate tester - is it true?
May 26, 2009 at 7:08 PM Thread Starter Post #1 of 1


500+ Head-Fier
Jul 7, 2007
I just installed SP2 for Vista, and for some reason my Realtek HD Audio Manager came up. I took a look in it for no real reason, and noticed it actually has a setting for default format. This goes up to 24-bit 192kHz to my amazement. So I went to the Vista sound menu in the control panel, and found the setting there also went up that high. I played the test sound for 24-bit 192kHz and it came through, which I wasn't expecting, as my 740C player says it's only receiving digital with a 20-bit maximum (192kHz comes up though), whereas the X-Fi I had on my old machine always showed 24-bit when it was set up correctly.

This leads me to believe the Realtek isn't really out putting 24-bit digital into my 740C. Yet the Vista test sample played. So what I was wondering is whether the Vista test is actually true i.e. the 24-bit test sample wouldn't come through unless it was actually 24-bit? If not, is there any way I can properly test if I'm getting 24-bit sent through?

As far as I can see from a quick browse on the Internet, the ALC888 codec does actually support 24/192 SPDIF, so I hope this is what I'm truly getting. However, I don't understand why my 740C would think otherwise if this is the case.

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