I just wanted to say thanks for introducing me to the world of headphones. Started with Apple Buds > V-Moda Bass Freq > CX300s > HD 555s > RE0's > RE0's w/ foam mod. Strangely enough, I started to like highs more than lows the more I lurked in these forums, bass != quality.
Anyways, I had money and I looked for an upgrade from RE0's. I saw some rankings in one of these IEM threads, and saw that I had to invest $200 - $300 for an upgrade. Looking at the dent in my wallet already from my IEM / headphone collection, I decided to get an amp. I decided to splurge and get a JDS Bass Boost cMoy 2.02 for $70 as opposed to a iBasso or $100+ amp.
I'm a teenager, so I'm into the R&B mainstream music. Yes, I listen to rap / r&b on my RE0's unamped, I'm satisfied with the bass. It's the mids + highs that defines sound quality IMO. With the cMoy, the RE0's gained a HUGE noticeable increase in the low ends. The mids and highs were left alone, and I felt that they also had a slight increase in "quality." Soundstage stayed the same, it became a little bit forward, and it gained little bit more energy overall.
I'm satisfied with my purchase, and I think that the $70 was well spent as opposed to my other amps ((COUGH FiiO E1 + E5)).
Oh wait, I'm not old enough, haha...