The 745 driver features a 3" diaphragm with edge wound ribbon wire voice coil, structural aluminum alloy dome and Mylar surround.
Sensitivity - 111dB 1W/1M.
75 watts AES power handling.
Now with a dual bolt pattern that supports both 3.5" and 4" diameter, four hole mounting patterns.
Replacement Diaphragm for this speaker driver is model no. 1750 with push button terminals
https://cdn.shopify.com/s/files/1/0111/0324/0254/files/745PB-data_sheet.pdf?v=1614300154