So you've heard the Mad Dogs yourself? From which sources?
The OP isn't using an iPad/iPod.
Blanket statements are not helpful. And copy & pasting someone else's opinion is also not helpful.
I'm not trying to be rude. Just simply stating that it should be kept close to factual where possible.
The T50RP doesn't need an amp.
The Mag Dog is a T50RP. It hasn't had any resistors added or anything. It's efficiency and impedance are the same.
There's a ton of misinformation around here that people seem to think that if you make something better, it naturally suddenly needs an amp. This is simply not true.