My guess might be perhaps the cardas A8. I havent tried it but that is the only positive option I have noticed in the market. If the cardas EM5813 was built better and perhaps had a little more present high I would happily stick with that, to me it shares the same bass and mid as T8iE. The sound of T8iE is the reason why I have focused on T8iE upgrade. I was in middle of finding a custom cable for T8iE that the driver just died while I was wearing it.