Scan speak R2904/700000

The Revelator tweeter series consist of the revolutionary ring radiator design, which put an end to some of the design trade-offs in dome designs. The ring radiator still offers unrivalled performance. Additional enhancements have been made to reduce distortion and power compression, such as large neodymium magnet systems for high sensitivity, and a careful design to optimize airflow in the chambers.
Datasheet: Datasheet R2904/700000

Size (inches): 1
Fs (Hz): 520
Re (ohms): 3
Sensitivity (dB): 94.5
Qt: 0.33
VAS (ltr.): 0.01
Xmax ± (mm): 0.2

DIY kits for this driver:
Ekta Grande made by Troels Gravesen
Ellam-XT made by Troels Gravesen