IPhone earphones play quietly?

Whenever I use earphones with my iPhone 4S I have it on full volume yet it plays really quietly, and when I use the side buttons is says high volume and the end squares are red, what's happening? I've used a range of earphones so I know it's definitely the earphone jack.

I think its to protect the end user. High volume over a long period of time causes hearing damage.
Apple do not want to be facing legal claims.
Long term it can cause tinnitus which is awful.
Or hearing loss.

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