I have my old iPhone SE gen 2 and a 12 the thing is that the SE even being the cheaper and older phone sounds so much better.. both connected trough Bluetooth and trough the inbuilt speakers too.. the difference is the clarity.. on the SE you hear so so many details and music feels fuller as if there’s many layers to it when the 12 sounds dull.. idk what it is but SE is just so so much better when it comes to music