The Muratas and Townshends, at least come on at 15K Hz and extend to 100K Hz. I heard a demonstration at CES two years ago where they played speaker with and without the Muratas being on. Furthermore they played only the Muratas while most of us were busy discussion what an improvement the Murata had given. Someone said, "Can we hear the Muratas only?" The demonstrator say that we have been hearing them alone. You could hear no music, only an occasional zip, ting, etc. I bought a pair on the spot from a dealer who signed on after the demonstration.
Initially, I used them with Beauhorn Virtuosos that really need extended top end, but I sold the Beauhorns the next year and bought Acapella LaCampanellas which extend out to 30K Hz. One day I thought that I might as well try them with the Acapellas. Their effect was at least the magnitude of using them with the Beauhorns. I will never again be without supertweeters.
Many so called supertweeters come in at much lower frequencies well within human hearing and don't mate well with speakers. I would avoid them. Yes, I know I am implying that supertweeters playing outside what is accepted as the limits of human hearing are best. YMMV.
Initially, I used them with Beauhorn Virtuosos that really need extended top end, but I sold the Beauhorns the next year and bought Acapella LaCampanellas which extend out to 30K Hz. One day I thought that I might as well try them with the Acapellas. Their effect was at least the magnitude of using them with the Beauhorns. I will never again be without supertweeters.
Many so called supertweeters come in at much lower frequencies well within human hearing and don't mate well with speakers. I would avoid them. Yes, I know I am implying that supertweeters playing outside what is accepted as the limits of human hearing are best. YMMV.