Between the large dynamic for solid, rumbly bass. And the Piezo tweeter for clean, treble with great timbre. Being able to clearly hear differences between splash cymbals and crash cymbals (or even different sized crashes) as a drummer is very cool. Some headphones lump those two sounds together and they sound similar. But the treble timbre on these is magnificent. The mids are recessed, but not to an unreasonable amount. If you are looking for a very smooth Vshape, fun IEM that still has detail, I cant recommend the Spring2 enough. Also the cable is amazing, and the case is serviceable as well. 6/5 stars.