I don't own any portable amps, but know enough that a $30 amp is probably not worth the money for these types of cans, even if it technically "worked" with them.
With regard to additional can recommendations, I haven't got anything more for you--given you want closed and based on your treble requirements.
Yeah, I'm planning on saving up for something better that would just stay in my room. In comparison between the KRK KNS 8400 and the Shure SRH 840, from what I've read, it seems that the 840s have a warmer tilt to them, right? How does this affect how my songs sound like?
Edited by Chimecho - 8/18/12 at 11:48pm