No, HD800 Well never be smooth like 650. They are totally different and always will be. But a good amp-match helps. If you want something smoother, Audeze is usually a good choice, unless you are listening at unusually low volume. Hifiman HE6 and HE500 are also warmer sounding than the HD800, especially HE500. If you like HD650, HE500 should be in your taste. The new HE 560 is very different, brighter, more like HD800.