To DDC or not to DDC. That is the question.

@jacupmakeup 

I also use 2 DDC's between my streamer and DAC as it is better than direct USB.  I think the clock in the DDC does not have to be better than the DAC's for the DDC to provide benefit.  Just avoiding USB noise can have enough benefits that an inferior clock can still benefit the DAC's performance.

@rikkipuu yep I believe you are correct

If you are using a computer as your streamer, I think a DDC will almost always help.

If you are using a dedicated audiophile streamer, it's very hit or miss.  

I contacted Merason directly and the DAC designer and founder of Merason responded. The DAC1 is built with the USB input optimized and he does not believe that an additional DDC would be of benefit unless I was using coax or AES/EBU. I’m using an Eversolo A6 with Beatechnik LPS as streamer. 

From Daniel Frauchiger: "In combination with the USB input, a DDC should generally not be necessary, as the incoming signal is re-clocked internally using very precise clocks. In the case of SPDIF or AES connections, however, a DDC can sometimes provide an audible benefit depending on the source and overall system synergy — this is something that ultimately has to be evaluated in practice."