I have a pair of RTR 240D that has a blown side tweet. I pulled it and it has no markings of any kind. Each cabinet has 2 tweeters on the sides of the cabinet, they measure about 2.5". I can't find any specs on these as far as impedance, freq response, etc. I remember stumbling on a sales brochure when I went down a Google rabbit hole several years ago that had SOME specs but don't recall it having a whole lot of technical detail. Tried to get the impedance off of one of the working tweets but they all measure 0 ohms oddly despite them producing sound. Any ideas on what I can replace it with or next steps I missed?