Using Subsonic with HEOS devices

[spdorsey]

I use my iPhone (AV Sub) and my Subsonic server to stream music. Mostly 320kb MP3 and FLAC files. I have a HEOS player attached to my system that has a pretty good DAC.
How can I attach and play to the HEOS without using Bluetooth? I'd like to have the best possible audio quality.

Any ideas? Thanks!

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https://usa.denon.com/us/heos-link