my iphone6 that is more powerful than previous models can't drive t5p. Sound lacks in dynamics, theres no punch to the sound, sound picture is flat and thin , treble becomes to prominent and low end is barely there, boring to listen to....
i also thought a portable amp would make a difference, i tried a few , like meridian explorer , hegel super , dragonfly but all it did was increasing or better say refine level of detail a little, smooth it up, sound wasn't so grainy but when it came to dynamics , t5p stil sounded boring and lifeless.
I tried many amps to match t5p , both portable and desktop amps , like Naim V1 , Meridian Prime , Hegel HD12 , Music Fidelity and few other...
it never sounded right to me , either sound was to stiff and overpowered or the opposite , weak and lifeless. So i end up using my t5p with ipad air for a while , it was the best match to my ears...
Then i tried t5p with beyerdynamic A1 amp and was surprised how well it matched , great synergy! sound became thick smooth liquid lush very musical , yet detailed powerful and finally low end got a punch , subbass goes really deep , bass is very articulated controlled and tight , most of the headphones got powerful and controlled bass ( i don't mean colored headphones like beats by dre) but bass comes kind of from one place in sound picture , with t5p bass is moving all around sound stage, coming from different places in different size and character ,it has layers and it never overpower the mids! A1 is studio like neutral, smooth yet very powerful amp , its a great match for t5p!
Personaly i doubt any portable amp can make t5p sing, witch makes me wonder why beyerdynamic made a portable headphone that need a desktop amp to get its full potential, strange ...