I'm not saying that. The SE530 is very sensitive as you know. You probably notice the hiss from your player with the SE530. The National has about as much hiss as a Cowon D2 or iPod nano 3G, so it is perfectly fine, just not the absolute quietest of amps. Actually, all modern amps I've used have had as much or slightly more. There are few exceptions.
As for driving resolution, the National does fine with the SE530. The SM2 is a harder to drive earphone than the SE530 by a measurable margin. The SE530 is just a very very hard earphone to love because it is so sensitive. I sold mine because of hiss with everything no matter how much I loved it.
well mine.dont have the hiss sound.and thanks for the info btw.gonna consider it