Defective external speaker?

Hey guys,

Well i bought an iphone finally this past week, and so far I'm totally loving it. Tonight, I was playing some music through the external speakers, and i noticed that the left speaker was playing the music louder than the right speaker. (I covered up each vent individually to verify this). To ensure it wasn't a poorly ripped music track, i went to the ring tones, and noticed the same thing. The left speaker was noticeably louder than the right. Does the iphone have dual speakers? or is it suppose to only come out of one side as mine is behaving? Thanks guys.