I tried the Onix supertweeters with 2 models of Alons. Misstl points out the possibility of coherence issues. I suspect the whitish coloration I heard in the highs was a coherence issue, super tweeters may alter the tonality of your loudspeakers.
YMMV may vary with different super tweeters and/or loudspeakers.
YMMV may vary with different super tweeters and/or loudspeakers.