Sony just announced 11 new models of IEM under the new XBA series, and they are all balanced armature based. This will mark Sony first entry to the BA based IEM market - a little late to the games, but comes with full force! The whole series spans from one to quad drivers IEM (XBA-1 to XBA-4) and their mic supported variation, plus one bluetooth model, one noise canceling model and one ear clip / sport model. Check them all out on Sony website here.