I am able to drive the K712 Pro with my 3rd Gen iPod touch, but I have to keep the volume around 75% - 85% and even from my BUDA the inefficiency surprised me.
Perhaps a note should be made that the K712 Pro is a touch less peaky in both the 500Hz and 50Hz square wave response perhaps making them a bit easier to listen to.
It is a great headphone to let people know how great the HD600/650 sound and the HD600/650 are great at letting us know how great the K712 Pro is. At times both amaze me.
From the charts we see almost a +10dB in bass over the K702.
There is definitely less bite in the treble on the K712 Pro. I found this listening to Iest Sexy by Shantel Vs Mahala Rai Banda. The trumpet is a bit more tame and less ear-piercing.
A fun track for the K712 Pro.
Can you hear the +10dB in the bass over the K702, I mean it sounds like sound coloration compare to the K702?