Digital clock - any recommendations?

@tzh21y

It does have a clock input, but what are you syncing it too? A master clock is to make sure all the components are in-sync.

All you have is your Marantz going into whatever preamp/integrated you have. Does that have a clock input as well? If not, there is nothing to sync the Marantz too. As pointed out by the other user, the Esoteric was using the clock to sync all of its separate components together, not a common layout for the majority of setups. 
 
DSD can’t sound more accurate, because PCM is already 100% accurate (down till -95dBFs at a minimum). Now, your DAC’s filter for DSD may be more pleasant, but that’s a case-by-case basis, and has nothing to do with the actual format.

Once again our friend  @mzkmxcv gets it all wrong. While clocks can help synch multiple devices a stand alone clock can also benefit a single device - were you not paying attention when I said to look at the dCS Rossini or Puccini setups or the review of the Vivaldi one? All of these single box systems that benefit from add on clocks

And your opinions on the perfection that is Red Book PCM are at odds with the vast majority of musicians, producers and audiophiles - again please take one of us up on listening to a real high end digital setup one day.

Might I suggest you buzz off and leave the op alone if you have nothing new to add?

The fact that the clock is external and thus needs a relatively long cable to connect is defeats any benefit in the increased accuracy. Even if the clock is better, the internal clock of the Marantz using a very short cable will be much better.

Also, I would wager that <10% of producers and musicians don’t even know what DSD is; so it is very inaccurate to state the majority favors it.

Length of BNC connection vs accuracy of original clock and problems with electrical environment herein -- that's what we call a trade-off, and that's why selection of the BNC cable matters. Of course in your black and white 44.1/16 = perfect world you don't care

As to musicians and producers -- well I guess on an audiophile discussion board we perhaps care more about those who do know what DSD is -- did you look up the Cookie Marenco link I posted? Those are the sorts of people we should be taking advice from ...

@folkfreak

If you think a multi-thousand dollar CD player has such issues, you’d be mistaken (or the product is garbage).

https://www.stereophile.com/content/marantz-sa-11s2-reference-sacdcd-player-measurements

Repeating the test with the Marantz’s word-clock input locked to a high-quality external source (a dCS 972 digital/digital converter) at either 44.1kHz or 88.2kHz increased the measured jitter slightly, to 271ps p–p, but with an almost identical-looking spectrum, including the rise in the noise floor to either side of the central peak. I couldn’t find any other measured differences resulting from externally clocking the player, but it could be that the dCS clock offers pretty much the same degree of stability as the Marantz’s own.

So yeah, like I said, there is no benefit to externally clocking any decent player; it helps in studios because it’s a multi-component chain and they want to be in-sync, a totally different thing.