How do you find using ST to process the audio? I find it makes a massive difference, especially as the internet radios have much smaller speakers than my hifi and also it can be noisy in there sometimes.
I'm loving it. I can't listen to my music without it any more. It's that warm, immersive sound that gets me. I'm using ST since some 6.x or 7. version, before I was using the SoundSolution Winamp DSP Plugin.
My kitchen radio has a a nice set of shelf speakers which due its size still lack the bass, but that can be almost completely compensated for using ST, as long as playing back at medium volume.
My second radio is my smartphone in the car, which has a completely different sound system (much more sophisticated than the kitchen), but sound is very nice there, too.
That is one of the unique features of ST that it can create a very dense and powerful sound, yet still retain the dynamics that don't fatigue the ears.
Triggered by your reports here, I'm going to fire up a Pi4 I've got lying around here and see if I can reproduce what you do using Jack.