Why is the volume level so much lower on Samsung Galaxy S4 compared to the iPhone?

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http://androidforums.com – Hi, last night I was watching the Glastonbury stream through the BBC Radio iPlayer app using a very loud portable Minirig speaker (wired using aux to aux) all on my new Samsung Galaxy S4. I was very disappointed to find that at full volume it was only just borderline loud. I initially put this down to limitations due to the source being streamed but I then decided to test plugging in my mate iPhone 4 and to my horror and frustration it was as loud as my S4's full volume just over half the way up. When I did dare to max the iPhone's volume to full it was incredibly loud and how I expected my ph (General)