There is only one situation where the word clock in is useful: you have
a DAC with a very low jitter internal clock AND it can output a word
clock derrived from that internal clock. You connect one of the digital
outs from the TP to the DAC and the word clock from the DAC to the TP.
This "slaves" the TP to the clock in the DAC. 

Note that there are problems with this setup, the TP runs at the sample
rate of the DAC, so you have to choose the sample rate at the DAC, not 
the source of the music. For example if your DAC is sending out a
44.1KHz word clock the TP can ONLY play music at 44.1 (because it is
slaved to the DAC). If you want to play a 96 KHz file you must either
change the frequency of the wordclock coming out of the DAC, or resample
the 96 file in the server. 

You have to be careful with undertsanding what is meant by a word clock
and a master clock. A word clock is a stream of pulses at the frequency
of the sample rate, 44.1KHz, 48KHz, 96KHz etc. The term "master clock"
has two different  meanings: 1) a word clock that is connected to
multiple devices, thus synching them all together, thus it is the
"master". 2) a high frequency clock running at a much higher frequency
than the sample rate, common ones are 11.2896MHz, 12.288MHz, 22.5792MHz,
24.576MHz.  These numbers sound weird but they are multiples of the
common sample rates, 11.2896MHz is 256 X 44.1KHz.

The TP only accepts a wordclock, NOT a high frequency master clock. Thus
if the DAC just outputs a high frequency master clock you cannot use it
with the TP. 

John S.


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