Planar iem’s in general will take all the power you can give. Planars prefer low output impedance amps that can give lots of current. They tend to scale well with more power. I had the s12 (not pro), and it sounded best on a singxer sa-1 desktop amp, a topping nx7, or a xduoo link2 bal. Higher current helped pull more detail, increase speed, and tighten up the bass. Underpowered planars sound slow/bloated and veiled. No need to go crazy, an xduoo link2 bal is probably all you need.

I tend to prefer DD bass which is punchier, but the s12’s had more detail and speed. I thought the bass was a definite strength. My only real knock on them was I felt like the soundstage was an average width with no real depth (2d). It didn’t feel as immersive as other sets I like.