How can I tell if I need a better clock for my DAC?

I suppose my response was an "all things being equal" one.  Of course if the rest of the circuit is screwed up, the best jitter clock in the world will be of little use.  So I assumed the circuit was otherwise competently designed and executed.  

A good example of the importance of the clock in an otherwise pretty well designed circuit is the optional upgrade to the femto clock by Wred4Sound.  Apparently the improvement is SQ is undeniable just by going to a better clock.

Yes, "a good oscillator (clock) is a good start".  Without a good start, you have nowhere good to go.  So what is this argument about?

I'm not here to show off what I know about bad circuits.

The issue posed by the OP was about a better clock.  So my response was about clocks.

At the current state of the art, a femtoclock, while not a sufficient condition is IMO a necessary condition to the best possible SQ.

Also, generally speaking, if a maker implements a femtoclock, chances are the rest of the unit compliments it.  In other words, it's a good sign of quality . . . generally.  If Steve N. wants to provide exceptions that he knows of, I'm all ears.

Thanks, everyone, for your inputs.  Unfortunately, much of what was said went over my head.  Could someone recommend a good, readable reference on dacs?

Proper spdif connection between transport and dac should be made using 75ohm bnc.
rca is not true 75ohm and this can also introduce jitter.

https://www.markertek.com/productImage/450X450/B-PF.JPG

https://www.amphenolrf.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/0/3/...

Cheers George