Don't know... Amazon seems to try and package it with every good 'phone. I think it is more for being portable.
I like the Shures on a strong amp that only moves when I want to move my system around.
Just as a reference, the Berhinger is $109 right now at most music shops. You get 4 strong head-amps in one box. There are bass, trebel, and so forth, as wel as individual levels on each amp section. The main input acts as the preamp, so one can play with gain on the pre vs. the amp section gain to get a proper sound. I alsol like that I can dial down trebel a bit. I hear beyond 20khz, so some things are hard to even listen to, let alone enjoy, Now I have 4 sections taylored to 4 of my favorite headphones.
It also let me bring my extra non-os DAC out from under the dust, and after hooking it up, the next improvement will be figuring where I can place my tubed output buffer and not have th EMF from it's transformer affect the sound of the DAC and amp.
