How to make my headphones louder through my iPhone?

I play drums and I bought a turtle beach headset that is super loud and perfect for drumming. When I use my laptop it is nice and loud but when I plug in my iPod or iPhone for YouTube it's not loud enough to play. It's a real bummer. I have them both all the way up and the limit in system settings is all the way up on both too. In other words its not limited.

You need to buy a separate amplifier for small portable audio devices.

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