At the risk of sounding like captain obvious, there's a less traveled option with increased mobility but it does have some sound quality limitations on your home hifi
Since you've already connected your iphone to your preamp, you're in essence using your iphone as the streamer
Look into the low cost USB attached DACs that will work with your iphone
I use the AudioQuest Dragonfly, $300 and it will achieve bit perfect playback
You can come out of the Dragonfly wired into headphones, your car stereo or your home preamp
The headphone is handy for comparing and testing the different streaming file formats
It transformed the sound in my car. I stream Tidal via cell service played through the Dragonfly that's attached AUX to the car stereo
Everyone thinks I got a new system in my car
Lots of little gymnastics to get to full MQA rendering and playback but pretty sweet once you connect all the dots
It took 6 months but the streaming convenience eventually pushed me over the edge to upgrade my primary home system
Primary drivers were the sound quality of the hi-res streaming formats and the convenience of changing out the music from a chair using a handheld device
I added a PS Audio DSD with the network bridge and cabled it to my internet router. Built a Roon server on a PC using an iphone as the content end point and user interface, subscribed to Tidal and QoBuz for content
I sit in my listening chair with 35 million songs at my fingertips using the iphone to select content
Sound quality is exceptional, the convenience of changing content from the hand held device is fantastic and I haven't bought a CD or album since converting
The new releases come out on Tidal and QoBuz
Needless to say, I'm finally a streaming convert
Hope this helps
Since you've already connected your iphone to your preamp, you're in essence using your iphone as the streamer
Look into the low cost USB attached DACs that will work with your iphone
I use the AudioQuest Dragonfly, $300 and it will achieve bit perfect playback
You can come out of the Dragonfly wired into headphones, your car stereo or your home preamp
The headphone is handy for comparing and testing the different streaming file formats
It transformed the sound in my car. I stream Tidal via cell service played through the Dragonfly that's attached AUX to the car stereo
Everyone thinks I got a new system in my car
Lots of little gymnastics to get to full MQA rendering and playback but pretty sweet once you connect all the dots
It took 6 months but the streaming convenience eventually pushed me over the edge to upgrade my primary home system
Primary drivers were the sound quality of the hi-res streaming formats and the convenience of changing out the music from a chair using a handheld device
I added a PS Audio DSD with the network bridge and cabled it to my internet router. Built a Roon server on a PC using an iphone as the content end point and user interface, subscribed to Tidal and QoBuz for content
I sit in my listening chair with 35 million songs at my fingertips using the iphone to select content
Sound quality is exceptional, the convenience of changing content from the hand held device is fantastic and I haven't bought a CD or album since converting
The new releases come out on Tidal and QoBuz
Needless to say, I'm finally a streaming convert
Hope this helps