BitPerf Support
New Head-Fier
- Joined
- Aug 7, 2012
- Posts
- 4
- Likes
- 10
Originally Posted by AppleheadMay /img/forum/go_quote.gif
Strange thing about my Dac (and this isn't only in BP, I downloaded a trial of some other software to confirm)
My dac is 192/24 + DSD 64&128. As I read, next to the DSD1792A dac chip it has a DSP chip that can upsample to 384/32 (even 48 as I read).
The software does recognize it as a 384/32 dac. You can't play 384 files through it though. It does play DSD 64&128 files.
Dac is Marantz NA-11S1, latest firmware.
When BitPerfect (or any other player, AFAIK) reports that it can recognize a DAC's capabilities, what it is really doing is polling the USB (or FireWire, or HDMI) format streams which the DAC announces during its connection handshake. If the DAC announces a stream format that it doesn't actually support, that would count as a bug in my view! In your case the DAC is apparently announcing a 32/384 stream that it doesn't support. In BitPerfect, you have the option of protecting yourself by setting a maximum sample rate and maximum bit depth so that "bogus" streams can be avoided to a limited extent.
An inherent problem of the DoP format is that for DSD64 it uses a 24/176.4 PCM stream, which the DAC has to announce. For DSD128 it is a 24/352.8 PCM stream. However, as far as the computer is concerned, it has no way of knowing whether the DAC is announcing a DoP capability or a PCM capability. Therefore, any DAC that supports DSD64 DoP really needs to also support 24/176.4 PCM, and likewise if it supports DSD128 DoP it really needs to support 24/352.8 PCM. FYI, DSD256 DoP, if supported, would require a 24/705.6 PCM format!