Septemous, they claim that oversampling converter upsamples all incoming data to 192kHz. Oversampling and upsampling are two different things. Oversampling is usually done by Phase Lock Loop (PLL) and is integer multiple of incomming frequency while upsampling is done by asynchronous rate converter that can upsample to any, usually eneven number and then output data at particular frequency like 192kHz. Upsampling provides superior jitter suppression and since your DAC "Upsamples to 192kHz" it perhaps is asynchronous rate converter based since 192 is not even multiple of 44.1
You have to try it with different sources. It is also important to keep quiet supplies to DAC because any noise can convert to jitter inside of the DAC. I use Furman Elite 20PFi conditioner for that.
You have to try it with different sources. It is also important to keep quiet supplies to DAC because any noise can convert to jitter inside of the DAC. I use Furman Elite 20PFi conditioner for that.