Originally Posted by Kh3naz
Thank you for replying ,
I just did some more digging around and came across this :
Maximum Output Level : Headphone: 350mW/channel @ 50Ω
Is any of you able to give me an idea of how much power this is
Thank you so much
It's still not clear enough. "Maximum" can mean peak short-term (ie, bursts for peaks in the music) or the maximum continuous output. If it's the first, then maybe it makes 175mW at 50ohms, hopefully at 0.1% distortion or less. We also don't know if it's better at current or voltage, and I think the HE-500 can use plenty of both. That might be loud for a dynamic driver HE-300 but we won't really know how it does with a planar magnetic HE-500.
That said if you can afford an amp and the HE-500, then the worst that can happen is that you need to buy an amp, so if you really plan on getting that headphone on top of what you have, I'd say go with it. If you think there's something lacking in the sound then check back in here. Mind you a lot of people won't hear the difference between a clean enough (not necessarily fantastic) Class A/B amp and, say, a good Class A amp in terms of finesse and PRAT; some will even note that the Class A amp isn't as good (because chances are it has less output power).