hi guys i bought my s4 couple months ago , the device is quite satisfying but i just come to discover s4 audio when play with a headphones has a flat tone sounds no base at all it's worse than a radio with no base , i was wondering should i change to sony xperia Z1 , before this s4 i was using the old type sony erricson walkman phones it's sounds is much better than this recent s4 Hmmm