Yeah I think the HD650 may have a bit more "body" to the bass and perhaps a tad more extension. However, in terms of bass quality, bass definition and bass detail, the SR202 truly beats out the sennheisers and the K702. I've only heard the K702 briefly and didn't quite like it. The stax would reproduce more "real" rather than artificial details and has the better clarity. The area where the SR202 beats out both those phones and most other dynamics I've heard is in its reproduction of clean, fast transients. A quality that one should be appreciated and relished when investing in stax. The SR2050 system is of very good value and quite frankly I'll take that over even the HD800 any day.