Sony Xperia Z3 vs Xperia Z2 speaker comparison

We compare the front facing stereo speakers on the Sony Xperia Z2 and the new Xperia Z3. While the HTC One M8 beat the Xperia Z2 in a face-off, can the Z3 - thereby making it a worthy challenger to the mighty M8? All will be revealed, and wait until the end to check out how the smartphones stack up against the Bayan Audio Soundbook Go, our favourite small form-factor portable Bluetooth speaker of the moment.