MMX-300 2. Generation : Treble and prety much nothing else

I was so excited to get these. I remember loving the 770s when I had them on loan for a week and yet these sound.. hollow. Maybe the soundstage is too big but it sounds like the music's playing from at least a kilometer away. I seriously don't know what's wrong with these, I tried plugging them into everything I have: my old iPod Classic, my 2015 MacBook Pro, my desktop PC, my Mackie Onyx 2.2 and I even borrowed my friend's fiio k3. It made no difference whatsoever. I can hear nothing but treble. The bass is practically nonexistent unless you listen to somethng where you only have a bass playing, like the intro to Another One Bites The Dust. Entire instruments disappear (electric guitars, violins, etc) and all you're left with is what sounds like artificial reverb.