Recording quality in Audacity differs with different headsets?

First of all, I'm not using a mic.

When I use the earphones that comes with iPhones, the quality of the recording is really clear when I play it.

But then when I use a Skullcandy headset, the recording sounds muffled.

What gives?

Added (1). When I listen to the recordings I recorded with the iPhone earphones with the Skullcandy headset, they sound clear. It has to do with the recording because one recording sounds the same with either earphones. If it's clear, it's clear for both.

Maybe skullcandy headset is a bit damaged? They should not sound too different. What matters when you are recording on audacity (or anywhere else) is the microphone and it seems like you are not using any - just the built in mic.

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