Sony Xperia Z1 speaker test (unscientific)
A short demo of the speaker on the Sony Xperia Z1, played at Campus Party Europe where it was very loud! This isn't Anandtech and it's not a highly scientific test!
What I can say is the speaker is certainly not up there with HTC's BoomSound, but it is louder than the Xperia Z.
You can of course downvote the video, but I'm not pretending this to be a thorough test.