15k for streamer and dac....how much on each?

I'd split 2/3 in favor of the DAC.  the DAC is the heart of your digital system. 

Jerry

I think your focus should be on that the performance level of the streamer and DAC are on the same level and that their sonic characteristics are synergistic and provide what you’re looking for given your tastes and in the context of your system.  However the price ratio works out after that is what it is.  Personally I’d start with 50/50 and move up or down in price for each as necessary to get the performance level and sound characteristics you’re looking for.  At that budget and however it ends up being split, I think you’re in for quite a treat.  FWIW, and best of luck.

Every system is different. I recently compared a Mola Mola Tambaqui, DCS Bartok, and DCS Rossini APEX DAC to my Chord Dave DAC in my system. A couple of weeks after the DAC comparisons I had a home audition of a Antipodes Oladra music server. I heard more signicant differences between the Oladra and my Antipodes K21/ K41 combination than between the DACs that I listened to.

There are certainly no absolutes though @ricred1 details an experience closer to my own. 

Every DAC has a favored input type and file type. Use the wrong one and streamers may sound the same. Use the right one and you might enjoy the appreciable differences between the streamer.

A home audition is a must. And that audition should really include trying the various inputs on your DAC with high quality cables.

Personally, I think 50/50 is about right but there are so many factors it’s hard to draw any specific conclusions. 

It would also help If you tell us what you’re considering and why, along with the rest of your equipment

Best,.