revive an old post...
did anyone here tried replacing a focal beryllium 1-inch tweeter of the utopia II series (e.g. diva, alto, nova, etc.) with a car audio version of focal beryllium 1-inch tweeter (e.g. "Focal KIT-TBe", similar specs but not exactly same as home audio's version)? some custom diy work might be needed (e.g. the foam surrounds are not the same size).