As far as I know, you have to make a spectre to xspec balance transfer first, before you can send coins to xspec. only xspec->xspec transaction possible. When you make the conversion spectre to xspec, the xspec address is automatically created afterwards (so you can't choose here, you have to input a stealth address for this transfer). Then you can send your xspec to any xspec address you like. Correct me if I'm wrong.