D16R2425 missing thin spacers / metal strips under the three mounting screws
Hello, help me please.
I need to replace diaphragms D16R2421 in the speakers JBL2421B in my loudspeakers systems 4345 from JBL.
I found an expensive genuine parts D16R2421 with an aluminum diaphragm from JBL. I also found a newer and cheaper titanium diaphragm D16R2425 genuine from JBL. These titanium diaphragms are also available in unbranded version and are very cheap.
When I see the images the new titanium diaphragms well, so there missing thin spacers / metal strips under the three mounting screws. These spacers shall ensure an air gap, and thus the air permeability between front and rear wall diaphragm. Air permeability in original parts is very small but it is there. I do not know why it matters. IMHO I think that this permeability is undesirable. Please, whitch replace diaphragms should I chose?
Thanks very much
Bohdan
Altec 808s with Radian phragms
I have Altec-Lansing 808-8As with 811B horns and Radian diaphragms.
They sound great but need to be crossed over at 1.2k.
I use a bi amp system with a DBX crossover.
They have also proven to be very durable with a 3B Bryston driving them sometimes to clipping they haven't failed in over 20 years:cool::cool: