@danb99 ditch airplay it’s not great
as to streamers - cheap ones will most likely not be an improvement. The expensive ones will be a waste of money if you continue to use Hegel’s inbuilt DAC as it will be a bottleneck.
If you’re not looking to spend a lot, try Roon for 30 days free (H590 is roon ready) with either Tidal or Qobuz or better yet both so you can determine what you like best. It’s completely free for the trial period. You can choose to buy a separate streamer later and 1) you will have a good baseline and 2) you will be able to compare.
P.S. Don’t use computer as a streamer via USB. It’s not optimized to serve as a network transport and you will not realize the potential of your gear.