Clocker value on a network player?

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.

With the exception of USB and Ethernet, all other commonly used digital audio interfaces (spdif, toslink, AES3, i2s) are synchronous. This means that the source (the network player in your case) controls the clock.  

Some DACs will buffer and reclock even these synchronous interfaces, but it's still important to have an accurate and clean source clock to reduce buffer under/overflows and noise. 

Many DACs sound better using one of these synchronous interfaces. For example, my Denafrips Terminator Plus sounds noticably better using i2s than any of the other inputs I've tried including USB.