Help me - am I stupid

It means that downloaded hi-res tracks up to 24-bit/192kHz from HDtracks can be played through this DAC.  This includes capability for all lower sample-rates including CD quality at 16-bit/44.1kHz.  They often have sales, up to 20% off, so look for those.  I would recommend FLAC or wav format for your downloads.

Playing back from a Computer using USB is easy, but in order get the best sound quality, I highly recommend Amarra playvback software on Mac or Audirvana on PC.  JRiver also works on PC.

Steve N.

Empirical Audio

I think the OP is asking, What is a DSD download, and how  come my CDP/DAC can’t handle it?
  First and foremost, don’t worry as there are not many DSD downloads available.  Steve is reassuring you that there is still plenty of high resolution music available to download and suggesting one well regarded site to obtain it.
  A digital waveform can be decoded in one of two ways: PCM, or Pulse Code Modulation, or Direct Stream Digital— DSD.  There are many people here better qualified than me to explain the differences, so either wait for them to show up here or do a search.  As I understand it, DSD samples 1 bit of data, something like 2.6 million times.  The much more commonly used PCM samples a “pulse” of bits, varying between 14 and 32 bits in length (most commonly 16, the ‘Redbook’ CD standard).
  DSD is used in SACD and some downloads.  Some audiophiles including yours truly greatly prefer it to PCM, but do to liscensing issues with Sony, the inventors of DSD, it isn’t widely used.  Meanwhile, high Resolution PCM, such as the ones referenced by Steve, sound pretty damn good

Well guys - I am a vinyl man - but am getting sick and tired of the continuous price hikes for every decreasing quality of LP's - so I bought a decent CD player that had the DAC input option - it's a cayin CDs 55T.
One of my other questions that both the guys who have answered may probably help with is this?

1. I get High res if the original recording was in high res, or if taken of master tape in high res - but what is the point in upsampling?
2. How do we know what resolution something was recorded in in the first place?
3. any point in going above 96 KHZ