sajunky
Headphoneus Supremus
I must say, it is better quality product that Douk / Leaf Audio U2 Pro. It has four layers PCB vs. two layers. Two layers board has no chance equalising ground noise to the same level.I was curious about the upgraded clock options, so I recently acquired a DDC with TCXO oscillators. Its relatively cheaper than the Douk with TCXO.
https://www.aliexpress.us/item/3256...2pIv1lr&gatewayAdapt=glo2usa&_randl_shipto=US
The difference with the Douk with standard oscillators is significant. More details, bass texture, better reverb. If my non-musician ears can sense the differences, then I would say, upgrading the clock is worth it, if the DAC is resolving enough. I have now ordered a Douk/Leaf audio with femtosecond clock. Aliexpress was selling it significantly cheaper than Ebay, so I grabbed one. Since I will have both the original and upgraded versions, I will compare between the two, once it arrives.
https://www.aliexpress.us/item/3256...2pIv1lr&gatewayAdapt=glo2usa&_randl_shipto=US
They also claim of using original Murata transformer and quality regulators. If it is true, U2 Pro has no chance in my opinion. Crystek oscilators (esp. CCHD-575) are sensitive to the PSU noise and in my opinion the U2Pro suffer from poor regulation. On-board regulators are also dangerous, as a destructive voltage is only 7V.
U2 Pro is more functional, having an option for external power supply. If you use with a noisy USB host it will benefit from redirecting ground loops, otherwise there is a little chance. But I waiting for your verdict, sorry to disappoint.
Last edited: