If I am playing a 96khz file, on the upsampler it uses W2 clock input - which makes sense as its 48khz. But if I send to DAC as DSD - the DAC uses W1 clock input (44khz multiple).
If I change upsampler to 384khz, then the DAC uses W2 clock input.
Said simply - if I upsample to DSD the DAC only uses the W1 clock input… if DXD it goes between W1 and W2
I’m assuming this is normal as the DSD outputted from the upsampler is only multiple of 44.1khz… Or am I missing something?
Correct Ross. The sampling rate of single rate DSD is 2.8224 MS/s which is 64x CD’s 44.1kS/s. All higher rate DSD variants are 2^n multiples of that, so all are exact multiples of 44.1. DXD on the other hand is the highest supported integer multiple of the original PCM sampling rate, which could be 44.1-based or 48-based.
What you say seems correct if your wordclock is configured for group 1 as 44.1 base and group 2 as 48 KS/s. As you say DSD is based on multiples of 44.1 KS/s
DXD automatically senses the required clock frequency and applies the appropriate wordclclock group ( i.e. W1 or W2).
So I don’t think you have any need to be concerned except when upsampling if you do not select DXD when using PCM. You would then be selecting the upsample output frequency manually and the Upsampler will do what you tell it. So to have the upsample with correct timing in these circumstances you have to make sure that the correct frequency multiple is selected by you.
NB: Mosaic system control in v. 1.4.3 misses DXD option for upsampling. I haven’t yet upgraded to 1.4.4. and will see if it has been corrected. However that exercise won’t happen until the weekend. Anyone want to pre-empt me?