So i have my grados which i find fantastic for rock but unfortunately dont do too well when it comes to hip hop. The only similar threads i can find are a year or more old so i thought perhaps i'd start a new one and see if anyone has any new recommendations.
 
My budget is $500, i'm looking for something thats preferably open backed (but im open to closed back as well), has a quality bass response and can hit those sub bass frequencies well. I did trial a pair of dt770's but found the mids too recessed which gave a kind of hollow sound that i didnt like too much. I have a few amps at my diposal like a Marantz CR-603 media player and the Fiio E09k+E07k so power shouldnt be an issue.
 
Any help would be appreciated thanks!!!

HiFiMan HE-400 is my recommendation.
 
V-MODA M-100 are another excellent choice but if open back is preferred or even acceptable, I would go for the HE-400s.
 
By the way, I absolutely love my DT 770 Pro 80 for rap, but I hear where you're coming from.

kon peki said:

  HiFiMan HE-400 is my recommendation.
 
V-MODA M-100 are another excellent choice but if open back is preferred or even acceptable, I would go for the HE-400s.
 
By the way, I absolutely love my DT 770 Pro 80 for rap, but I hear where you're coming from.

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Yeh i was considering the HE-400 but there seems to be mixed reviews on its bass response, some say its amazing while others said it was disappointing. I've also heard that the mids on it can sound a little recessed sometimes, would you say this is true?

I'd guess that those who find the bass impact lacking are either listening straight from an iPod, etc, or looking for booming mid-bass.  I find the bass from the HE-400 very punchy and impactful.  The mids may be a bit recessed compared to something like the HE-500s, but they are clear and detailed unlike certain booming bass monsters where the mids are just overwhelmed.
 
Personally, I have never had a more enjoyable headphone listening experience with rap or rock than I have with the HE-400s. 

I highly recommend this HE-400 review, which was the one which sold me on these headphones: http://www.head-fi.org/t/634201/battle-of-the-flagships-58-headphones-compared-update-audeze-lcd-2-revision-2-6-4-13#user_HE400