Received my Denafrips Venus 15th

With pure DSD coming from SACD via I2S, the OS/NOS light on the Venus 15th will not switch on. What is this telling me?

@vthokie83 and @skasundr.  I am tagging my questions onto this threaded so you don’t feel that you need to repeat all the work you already put in.

I’ve been trying to figure out what I need to do to upgrade my 30 year old Krell Studio DAC.  So far, my digital music has been limited to CDs played through a Moon 260DT transport (no DAC) connected with a Cardas Parsec coax digital interconnect.  At my age with >1200 CDs and >600 LPs, I haven’t felt the desire to invest in streaming music from online sources.  Even limiting to a single digital source like CDs, I’m not sure I fully understand the various options.  My system is reasonably revealing and capable of creating a wide soundstage with decent imaging.  Whatever I buy needs to be a substantial upgrade from my Krell Studio.  

Most/all YouTube equipment reviewers appear to be evaluating new DACs using streamed sources through their USB or I2S connections.  Currently, I am limited to Coax or AES/EBU.  Perhaps it is my lack of understanding (feel free to correct me if I’m mistaken), but many of the improvements in SQ as they go up the product lines in each brand get to improvements in USB interface, FIFO buffers, and digital clocks.  Those benefits would all relate to streamed music.  

If my source is from a CD transport, would I hear much difference between a Pontus 15th and a Venus 15th?  

Would my CD transport benefit from a DDC?  Would a DDC reclock the digital signal?

For CD-only playback, would I be better off with a Hermes/Pontus 15th or with a stand-alone Venus 15th?  

Again, for CD music only, would I hear the benefits of a Holo May KTE vs. either of those Denafrips DACs?

Why would a Venus 15th benefit from a DDC if it has its own I2S and USB inputs and its own FIFO buffers and OXCO clocks? 
 

As you can see, I remain pretty clueless with newer digital technologies.  The Krell Studio was highly regarded in its day.  It hasn’t seemed like a no-brainer choice and I no longer have friends who are audiophiles with whom to communicate.  The Moon 260DT, the Cardas Parsec, and an upgraded power cord for the Krell have already provided substantial improvements for my CD playback.  

@sealegs   It appears you ( like me) keep your gear for a long time. I would recommend you get the Venus 15th and a Hermes. buy a quality I2S cable as well as 2 quality BNC digital cables. Plug your AES/EBU cable into the Hermes. i2s from Hermes to Venus 15th. Then clock sync the Hermes to the Venus. This will take advantage of the OCXO clock on the Venus from your CD transport. It will be more than you planned to spend but you will be done for a looooog time. 

The USA dealer that sells with a small discount in the USA is @audioman58

Audioman58@gmail.com

@fthompson251   Thanks for responding.  I’m sure your recommendation would sound great.  But that is more than I was hoping to spend (I also would benefit from a couple REL subs).  
 

Would your suggested set up be better than a Gaia/Pontus 15th combination?  The Gaia would have the OCXO clock and together would cost similar to a Venus 15th alone.  
 

Are there any rumors about Denafrips upgrading their DDCs to 15th anniversary models like they did with their DACs?