[EdipisReks]

one thing i have to mention about the DT990's is that they are a little bit sibilant. i think that the DT990's would probably be driven decently by a MINT or CMoy. the DT990's are 250Ω, but they are fairly sensitive.

[edit: i just remembered that i've heard the DT990's straight out of my iPod, and it sounded decent and was louder than i would have expected. i'm nearly 100% sure that a CMoy or MINT would do an adequete job, though obviously not as well as a Moth si2A3 or something

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[SptsNaz]

I would also recommend Grado's (specifically SR60's here), as I found them amazing with some of the rap I listened to when I had them. Imo the bass is great for rap music and the like

 

[CVTC]

delete

 

[stevendom]

Beyerdynamic DT990

That is the DT770 except its open. here are some pics. dt990

Any cheap amp recommendations for any of these?
Or is and amp even needed?

 

[Jackson9696]

The Denon d600 is fantastic with rap and works well straight out of a smartphone. Highly recommended.