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've recently upgraded from a HTC One X to a HTC One. I've noticed the volume control isn't as good with the new handset, as the lowest volume setting is still quite loud. With my HTC One X I could put the volume of games down so that it was loud enough for me to hear, but not loud enough to annoy anyone in the vicinity ie my wife lying next to me.