What are people using to upgrade from Channel D Pure Music to play from iTunes

Streaming from your Mac is a bottleneck.  Get a good dedicated streamer, ditch iTunes, and get Qobuz or Tidal depending on which music catalog better matches with your tastes in music. 

Does your DAC connect directly to Tidal? I have to go through my Mac to stream to my DAC, maybe that kills my quality.

Audirvana Studio has a Music Integrated Mode to access local files via Apple Music app

I have to go through my Mac to stream to my DAC, maybe that kills my quality.

That’s why I recommended getting a dedicated streamer so you can get your Mac out of the picture. 

Suggest an Innuos streamer.  Several choices depending on your budget including used ones.  Recommend Qobuz for your music.  I have a Zen Mk3 streaming Qobuz using the Sense app that Innuos has and it works great.  

Thanks for the help, I'll look into that

Any other streamers I should be looking at 

What’s your budget?  This Innuos Zen is an excellent streamer at a very good price, and you can also load all your CDs into it if you want so all your music would be available from one source.  Innuos’ app is also best in the biz and very user friendly, which is also an important consideration. If it’s in budget I’d highly recommend jumping on this, and it’ll be a substantial upgrade in sound over your Mac.

https://www.usaudiomart.com/details/650163113-innuos-zen-mk3-2tb/

if the idea of streaming using a dedicated network music player can be intimidating. Might I suggest a WIIM mini which can be found on Amazon. This little device does everything the big boys like INNUOS and AURENDER. Now you can get over the learning curve and be prepared for your future, buying decisions. 
 

Another Aurender happy customer, but depending on your price range, the Bluesound Nodes are all good with the newest one, the Node Icon getting great reviews.

I've been looking at the INNUOS and I can swing the 3-4K range. I think that may be the way to go, any suggestions on where to buy from? Thanks for all the advice.

I changed from Puremusic on a tuned Mac Mini to InnuOS Zenith Mk3 on now Sense 3 five years ago. Never looked back, SQ is night and day.

if there is a need to Still rip CDs I would look at one of the INNUOS ZEN series.
Otherwise, with that budget, I highly recommend the INNUOS Pulse.

As far as purchase look on the INNUOS website for dealer location information. There are a couple of online dealers like Audio advisor, and The music room. 

Buy used.  Here’s an Innuos Zenith you can get for less than the price of a new Zen, but others are available too you can find on hifishark.

https://www.usaudiomart.com/details/650182374-innuos-zenith-mk3-2tb-storage/

Your Mac is fine. Don’t replace good machine with some low power ARM streamer. My Windows box streams just fine, Aurender is not any better so I end up not using it. And beside, why would I want to control some unit from phone when I have 34" screen with Tidal?

Tidal with max quality is better than CD. However, they only stream new, remastered editions. So you may be disappointed if you prefer older mastering. Ex Tony Iommy screwed up old Sabbath mixes pretty good.

I have found Tidal to be somewhat dissapeointng, I switched over to Qobuz.