The Mad Dog won't do you any good unamped either. They are orthodynamic headphones and have a low sensitivity rating which means they are harder to drive. Impedance can be low but hard to drive if the db/mw rating is low.
Cheaper amping like a $250 dollar Audio Gd or similar is far and away better than nothing. Even a cheaper combo unit like that can show you a degree of what top headphones can do unlike being totally unamped. Not that they cannot improve further or anything though.
Best to try some cheaper amps out like the Magni + Modi or similar with your Mad Dog's and HE300 and see the difference from unamped.
Good luck in your endeavors with the HE300
Thanks a lot, I got a Fiio E11 at the moment, a very cheap portable amp.. Don't think that will do the job, would it?
I just took a look and the Magni and Modi, but I can't see them being sold anywhere I live (The Netherlands, which is in Europe).
Also, I'm not sure if these are portable amps or not, but for the Mad dog I'd prefer a portable one, since that one will be for 'On the go'.
And what you're saying is I should also pay attention to the db/mw rating? Stuff like '93 dB @ 1KHZ, 1mW'?
I'm pretty new to this great world of headphones, so it'd be great if you could explain it a bit!
PS: I'm very sorry for derailing this thread.