I have an iPhone 5S that I keep in an Otterbox case, because, well, I'm clumsy. I recently purchased a set of Shure SE215 to use as IEMs with my band and would like to use them with my iPhone as well. Unfortunately, the plug doesn't fit in with the phone in the case. Anyone know of an adaptor that definitely fits? The only ones I can find locally are attached to a 6' cable and I don't need that. I know there are plenty on eBay and Amazon but I don't want to order if it doesn't work. Thanks!