Hi,
I have read somewhere here that people swap the foam in the back of their 4" compression drivers for felt and that JBL uses thicker stuffing in the back cap of the K2 drivers (476 and others). I even think the back cap is deeper on these models.
I tried to search but did not find the thread.
Can someone please help me with info what type of felt to use (and where to get it) and what thickness would be appropriate?
Is there any advantage of using thicker felt that the original foam pad?
I am going to change in some 2451’s and a couple of 2447’s.
Kind regards
//RoB