With this budget u can expect a lot, but in my opinion the "Superlux HD 668B" are the best you can find for less than 50 dollars.

Ok, thx for all of the advices. My setup is a bit weird i know xd. But as i said i just started to invest in sound quality and obviously i had to start with the headphones.   Step by step.   Btw, both of the FiiO that u said seem great. 

Ok, thx for everything anyways.   My phone is an iPhone 5s and my laptop a Realtek integrated audiocard, nothing special, thats why i was looking for a DAC

Yes, sorry i forgot about commenting that i was searching for a DAC and Amp to connect them in my pc or my phone most of the times. You can recommend me some amp and dac that are more or less portable?

Hi guys, this is my first thread and i wanted some help with my new headphones.   Im always hearing music and until the last week i was using a 30€ sony headphones and i thought I needed to do a step to improve the sound quality, so I started my journey into the hifi and i bought an AKG Q701...