This will have to do until I get some more time, and a bit more familiar with this website (which is actually SUPER EASY. I'm a total computer newb).
Here is a thread where I modify an old FullRange driver by removing the stock treated paper surround. I upgraded to a foam surround which is more compliant and has better damping characteristics.
While I was at it, I damped the basket legs and any reflective surfaces.
Pics are linked to Image Shack.
Stock CalRad CR-12A
Stock CalRad CR-12A Fullrange driver.
Modified CalRad driver
CalRad CR-12A modified with inverted foam surround instead of the stock pleated paper , basket legs filled w/fibreglass and wrapped with grill cloth, felt/cloth carpet padding ring around perimeter of spider, cork mounting gasket, no dustcap, whizzer damped with 3 "glue dots"(craft supply) placed at 1/3rd increments axially and radially, rear badge replaced with grill cloth.
Overlayed response , Stock and Modified CalRad CR-12A
Overlayed response , Stock and Modified CalRad CR-12A.
Stock Stats; Fs:57 Qts:1.3 Qes:1.73 Qms:5.36 Le:.3856mh @ 10khz , 6.68cu.ft.
Modified Stats; Fs:37 Qts:.976 Qes:1.1 Qms:8.65 Le:.3782mh @ 10khz , 15.69cu.ft , Mms:15gr , Bl (calculated by WinISD Pro):5.66 N/A