If you are into Hip-Hop music, you probably want to listen to it with a great amount of bass using a subwoofer. If you do like bass, then you will also like the A4Tech MK-610 metallic earphone.
Basing from my personally experience, the sound quality of the MK-610 is very very 'bassic'. When I tried listening to some tracks from Bass Mekanik or any tracks that has lots of bass using the MK-610, it's like I have my personal subwoofer in my ears. I really feel and hear every thump and beat that I was scared of having a permanent ear damage.
If you want an affordable, yet great quality in-ear phone, I would suggest having an A4Tech MK-610. You won't regret the sound quality of this in-ear phone.