Scanspeak D2104/712000 Tweeter - Revelator Range

The Scanspeak D2104/712000 is a 20mm soft dome tweeter featuring a large neodymium ring magnet system, a copper capped pole (SD2 symmetrical drive), a non-resonant rear chamber, a large roll surround and a precision machined anodized aluminium faceplate. This is a new addition to the highly regarded Revelator range. 

Key Features:

• Patented Symmetrical Drive (SD-2) motor​
  
• High frequency extension beyond 40kHz​
  
• Non-resonant rear chamber with technical felt damping
  
• Neodymium ring magnet system with double vent​
  
• Coated textile diaphragm with large roll surround
  
• Machined & anodized aluminium faceplate

Basic parameters:

Here's the full datasheet: