a professional review...
Professional as in "we get paid for ads and review accordingly."
I don't have your track and I just went as loud as I could on a few other tracks FiiO E17 at volume 27. I even hit the EQ with bass +4. My UE900 sounds great, the bass is incredible punchy and clean. I've tried Electro from Noisa, Alex Gopher, Gingy and Crystal Method.
I am guessing it's a recording error (clipping).