Will Audio-Technica ATH-M50's work without an amplifier?

I'm looking to get the Audio-Technica ATH-M50 headphones. I would mostly be using them with my iPhone 4 and my Macbook Pro 13". I listen to all sorts of music, from folk metal, hip hop, jazz, and pop. I don't know much about these higher levels of headphones but I know this pair is very good for the price. I have read a bit about portable amplifiers, but I don't know what that really is and if it would be necessary.

Your Iphone4 and Macbook have built-in preamps. The ATH M50 works well without an amplifier and can be directly coupled to you gadgets. If your laptop is equipped with an audio equalizer then the M50 would bring out its ultimate potential!

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