Clocker value on a network player?


Looking at high end network players and it says it has a high precision clocker.  So my highend dac has great clocking too.   
Most higher end dacs have clocking capabilities, so why put it in networkplayer?  
jumia
Because when run thru a synchronous digital output it eliminates reclocking at the DAC level. This is thought to produce less jitter and thus a quieter, more detailed presentation vs running thru noisier USB.

Of course there are many variables but it provides another option to see what produces the best sound. Results are going to be very system dependant.

Thanks,  what is meant by synchronous digital output ?  So it may be better to not connect via usb interconnect to the dac?
Synchronous signals are one way. The DAC is forced to accept the samples as they come in. With say a CD turner, external DAC’s were forced to accept any incoming timing variations.  The DAC is forced to synchronize with the source.

Asynch uses 2 way communication to allow the DAC to control the sample rates. USB can be asynch. Coax/Optical cannot.