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dac amp combo
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598's are 50-ohm cans. While they can be driven directly by a phone, tablet or laptop they will definitely benefit being paired with an amp/dac. This is the case even if you're streaming or playing modest bit rate sources. I've owned/used a number of products. For USB output The AQ Dragonfly is a solid buy. You'll hear improved dynamics, more solid bass and better resolution across the entire range.
You're absolutely right. The impedance graph here really shows it all.
Notice the massive spike right in the middle of the bass frequency. Low power sources don't have enough oomph to power the bass and low midrange frequencies to their full potential like a pen external amp can, which is one of the reasons an amp can change the sound so much for the better.
EDIT: That said, I use my cell phone and iPad to play music with my headphones most of the time, and have stil been able to have a great experience. In reality, the reason I am looking for an amp is for my computer to replace its slightly sub-par onboard audio. For my speakers, it works great, but headphones leave something to be desired.