Sound wise, I like it better for my SRH840 and UM3X. although mine has a few issue with my laptop. it sound really nice for my untrained ear. it is very powerful and you need a volume control or amp for it, else the hiss and crazily loud volume will kill your ear if plug your earphone straight into it. I do not know if something 300~600ohm but my SRH840 will produce volume that will penetrate my ear and my head without a volume control.