So, essentially, as long as you have enough power to properly amplify your headphones, nothing else really matters?
i.e. If someone has their headphones plugged directly into a PC motherboard with on-board sound, as long as that mobo has enough power to properly amplify the headphones, there's no reason to get a separate amp and DAC?
And the big question (hence me asking earlier in the thread) was properly amplifying. I think this is where some people get confused a little too. From what I have learned - properly amplifying is sometimes confused as only being about volume. My iPhone at ~ 70% will actually get my K701s and Q701s loud enough. Heck at 90% volume it will get my 600 ohm DT880s loud enough as well. But using an under-powered source can cause havoc with the frequency response.
That's why I wanted to check on a portable amp that would drive the K701 "well enough".
Ah, and this is where I get confused. When enough volume ≠ "proper" amplifying.