The HF2 are my first grado headphone, so I didn’t know what to expect from this headphone at the beginning. At first listen I didn’t like it that much coming off balance HD650. The sound is very raw, full of energy and in your face. Lacks the refinement of the HD650. After putting so more hours on this headphone I started to like the in your face sound with rock music. So I chop the ¼ stereo plug off and reterminted the ends with 4 Pin XLR so I could listen to them on my LD MK6.
The LD MK6 balanced amp drives the HF2 with plenty of power, very different sound compare to HD650. HF2 is in your face, on stage kind of sound great for rocks and vocal. I notice a lot of bass with HF2, but not as detail as the HD650. While the HD650 is more accurate, refine, laid back with bigger soundstage, greater depth is better suited for jazz and classical music. The HF2 is still very good with jazz and classic but not as good as the HD650.
These are fun headphones and its a keeper for me, but they don’t have the micro details and accuracy of the “Balanced HD650”.
One complain is the cable is too short….....