So I received my BA200 and I have finally found what I was looking for. I am absolutley in love with the hd650s and struggled to find an IEM equivalent.I feel the BA200s come close. All listening was from the o2/odac. The bass is just behind the hd650 and gr07 in impact and quantity and is very tight and controlled. Only the sub bass is a little underrepresented. The mids are smooth without any upper mid harshness/peakiness and is very close to the hd650 in quality. The highs are balanced, they are definitely "there" but are not shoved in your face. Again very clean and no frequencies seem over represented. I feel the BA200 is better than both the gr07 and R-50. The gr07 has really nice lows but I feel the lower mids and mid bass are recessed slightly. Almost seems like some frequencies are under represented. Also, there is some serious peakiness in the upper mids (very hard to listen to audiobooks with this one). The R-50 on the other hand is more balanced than the gr07 but lacks the clarity and body of the BA200 sound and the bass quality to me is a little lacking. At the $140 price the BA200 is the one to beat!
I do feel the sound is very tip dependent... the dual flanges really lacked bass and sounded very thin. I wasn't too happy when I tried to use them with the dual flange tips but was surprised when I used them with some single flange tips that came with my rockit sounds r-50.