Hi all, My Sony headphones (I think they were the MDR-ED31LP Fontopia, bought them £20 at HMV) have recently become very unbalanced in sound. I used them on my NW-HD5H since the ones provided are not really that good in terms of bass (and quality imo) and positioning in the ear. Unfortunatelly, the right one doesn't play any bass anymore. Has anyone else encountered this? Even so, the quality of the bass was excellent and I was really satisfied with the overall quality of the headphones. Since they need be replaced, I have recently saw that the MDR-EX71SLB Fontopia sell pretty well so it made me think to buy those instead of the same pair. Has anyone had these headphones? Are they of good sound quality (and how's the bass?)? And the most important thing: do they break often?