Wow amazing comment, Thanks!
I see many people use amp even with Ipod nano.. why so many people use it if it just amplifies the sound?
Like.. the max volume isn't enough for them or something?
Hanging around these forums has a way of making folks want to buy stuff. If you're looking for a hobby you can dump huge amounts of money in, you just hit the jackpot!!!
I'll surely get flamed for this, but here goes: A lot of times folks will read about something and think, "Oh boy, that's what will make me have multiple eargasms all day long", then they buy it and because they have such high expectations, they'll typically do one of two things:
1) they'll realize that the product didn't live up to their expectations and feel let down and bash the product or simply return it and go on with their lives a little wiser than before.
2) they want desperately to feel like they got their money's worth and they need to justify the outlay of cash and so they immediately jump on Heaf-Fi and rave about how "much more awesomer" their music listening is now that they have the new "(insert gadget name)".
I don't see it as much these days, but used to you could find Ray Samuels portable amps and DAC/amps in the FS/FT forums any day of the week. I'm not bashing RSA at all, but the fact is, RSA products are highly engineered and American made and thus very expensive. As consumers we tend tho think that the more we spend the happier we'll be. But when we get our shiny new toy and realize that we'd rather have all that money back, off to the FS/FT forums it goes.
Now you may think that all this is quite cynical. I think of it as being realistic and these are just my thoughts and opinions from having been into headphone audio, bought and sold several pieces of gear and been a member of the forums for a few years. So let me say this: Amps do have a place. Just like in my example I bought a portable DAC/amp and keep and use it when I want to be able to drive my Sennheisers decently when I'm away from my main home rig.
By the way, welcome to Head-Fi, and I would encourage you to read a lot of stuff here with a healthy dose of skepticism and trust you're own ears to tell you what sounds good. If you go out and buy some Dr. Dre Beats and like them: Great! If you decide that you spend enough time listening to headphones and have the money to spend to see how high the high-end of headphone audio goes, your in the right place.