These are the ones that I have liked
Corona Plasma Tweeter
- Frequency Response -1500 Hz - 150 kHz ±3dB
- The most Natural effect on the entire sound spectrum for human hearing
RAAL Ribbon Tweeter 70-10
- Frequency Response: 2,000 Hz - 100 kHz
- Quick, Agile, Effortless Overall Sound Presentation
ELAC Omnidirectional 4Pi Plus Ribbon Super Tweeter
- Frequency Response: 10,000 - 50,000 Hz
- Can be Seamlessly Integrated with Virtually Any Loudspeaker
- Enhances the Sound from the Loudspeakers and Fills the Entire Room with Music