I'm looking for a bit of help, I have just got a pair of Ultrasone DJ1 and i'm really happy with them but they sound seriously flat coming out of my ipod compared to when plugged into my stereo. I'm looking to get a bit more volume and bass out of them, i don't want to spend too much so i'm looking at either the CmoyBB or the Fiio E11, so what's your opinion?

I'd like to throw the ZO into the equation. I'm having a hard time choosing between these three.

I like the E11 good transparency, clean bass boost, good size.  I'm getting the Cmoy 2.03 tomorrow or Monday, havent heard the Z0..

I have the same headphones. I'm buying the E17 since i also needed the DAC in the E17. Most Ultrasone users would like FiiO more as they have a tighter bass punch(the E11 especially)
 
The ZO2 is a good competer but it's been plagued with many problems. I can't "tell" you that it's all without problems now as they keep on claiming :/ it's been 3 revisions in...like 2 months
 
The E11 vs zO2 is a big...hmmm. if you like your bass strong but can choose. then the ZO2. if you can't afford it, need punch bass that also boosts and makes the whole frequency range sound better then the E11 is what you are looking for. The PA2v2 is also a popular competitor. but with a bassy headphone like the DJ1's the E11 and bassier amp is probably what u should be looking at.

I'm going to go ahead and put my vote in for the E11, imho it's more powerful than the Cmoy v2.03, also the bass punch and quantity is no contest E11 has much more even with the bass boost switch on the cmoy...

Thanks KimChee you just confirmed my thoughts and i'm going to go for the E11.

I'm curious as to which is better between the E11 and CmoyBB 2.03 aswell On the JDSLabs website - customer feedback one user commented that "I am very impressed with the build and sound quality of this amp. I have a dual chip cMOY from fred_fred2004 and a FiiO E11 - your V2.03 is in another league. Far cleaner sounding, with great timbre, tone, bass and musicality. I am enjoying it immensely" So he says its better than the E11 ?