Originally Posted by florin5000
That's why i asked if an additional amplifier would help me so i won't be forced to almost maximize the volumes on FiiO and computer because i know that if you maximize you have more distorsions
Amplifiers actually perform best when their volume is set towards their maximum.
Getting a new amplifier, that provides more power, a different sound staging, different coloration, will make a small difference to your listening. It's not necessary. It will not be a big change. It will be a subtle change. The question is whether or not you think spending $100~200 on something that will provide a tiny, if any real noticeable change, is worth it. Right now you're listening and having no issues with volume. There's nothing wrong with running a device at maximum.
If you truly just want to spend some money, I would point you towards a Little Dot MK II+ in the $200 range for an OTL tube amp for your headphone.
Otherwise, some solid states: JDS O2, Schiit Magni and the Fiio E09k.