[ashman]

I want to buy an amp just to improve the soundstage and quality of music for my bayers DT 880.
 
Requirements :
 
- Portable or a full size amp (dont mind much)
- Price range is flexible as long as it is a boost to my headphones but ofcourse it can get higher than the cost of the headphones themselves 

 

[MrViolin]

An amp won't improve a sound stage, but it will improve the signal/phones and give enough power so that it'll appear so. However, it will not be much. You won't be able to go from dt880->k701 or k701->hd800 or hd-800 -> k1000
 
You moving up from no amp?
 
Bellari HA540 (play with some tubes, tube roll)
O2 amp
Matrix M-stage (opamp roll, class-a biasing)

 

[gambitallin]

try Argon HA2 pre-tubeamp.

 

[TsukiNick]

In my experience amplifiers seemed to reduce crosstalk on a few of my headphones.  Weird, but maybe that's why it creates a larger soundstage.  Just a thought.