Don't even consider trying to do this. not only will you end up with a butchered pair of 1530s that will probably be worse for the effort (and likely worthless), but the likelyhood of finding L2030/1530 mids is slim... and they should go to people who need to replace blown drivers, not to some bizzare franken-speaker project. Enjoy the 1530 as it is, it's a great speaker. if you need a 2030, find a pair and buy them. you can't make a 1530 into a 2030 no matter how hard you try. Frankly, it also sounds like you lack the technical skills to really do this right in any case (presuming it was a good idea, which it's not), thus it is to be doubly avoided.