are you trying to run both those subs at the same time? if so, that is a very bad idea and i think you would benefit buy selling both of them and reading up on this forum and others until you know what you are doing.
well hifonics amps are always overrated in their rms ratings, but i heard that all the exceleon stuff is great. pm prowler573, he loves the excelon stuff and he can tell you all about it.