How old are your speakers? What happened to the tweeters? Speaker companies using OEM drivers are famous for claiming that stock units are not the same. Unless it is built with proprietary technology, what you normally have are speaker manufacturers paying $10.00 for a tweeter and wanting many times the price for a replacement. Strange thing is that you can line up a hundred audiophiles who in all good faith will tell you that this is warranted. ThatÂ’s how you get to charge 40K for a pair of speakers, Better than neodymium is unobtainium, then you get into real serious money.