justrest
500+ Head-Fier
The Sphere should be in your shortlist. Even with stock tips & cable.
Upgading to Sedna & OS849 sends the listener to a higher level of engagement.
Sphere=CD format resolution (mids & treble, not crapping out the bottom end)
Fantastic, huge staging, immersive, 3d imaging & holography...
I also combined my Sphere with Penon Leo and pretty impressed by the result. Sphere might be the best single balanced earphone I’ve ever heard for the price. I would like to try those Sedna tips as well.