[TheEvilNarwhal]

I am looking at getting either the Sennheiser hd25-iis or the hd598s for my first pair of mid-fi headphones. I was wondering what portable headphone amp would work good out of an ipod or computer. Any recommendations are welcome.

 

[Mutnat]

I have no experience with the HD 598 but I really enjoy my JDSLabs C421 (with OPA2227 opamp) with my HD25's.  They pair quite well.  Not so with the iBasso D-Zero, I'd avoid it with the HD25's.