There's not enough power output on the Pono to drive AKG 702's properly...wrong headphone choice for the Pono without additional amplification.

i have the AKG K701 that i use with my Schiit lyr and find that for rock or metal the phones are lacking fundamentals...the bottom part is kinda thin...I also have some westones W3 that i use with a cowon Z2, and the W3 are much better for metal...I am looking into electro for rock/metal...maybe...

i use Schiit Lyr with my AKG K-701, and like the combo. The bass tightens up, the soundstage gets a face lift of sweet defineness....But i must admit that even with this powerfull little amp, i stll find the headphone are missing some low frequencies response for rock music...works well with...

i have Westone W3, and i am curently listening to the album Six degrees of seperation from Dream Theatre, and i must say i am really enjoing the sound i am hearing...well balanced, clear, good stage width and depth...loving it...the guitars have good texture...a bit 3d...the drums have a nice...