I've been all over the forum looking for information on what to do with 2470 drivers without diaphragms. The general answer seems to be the original phenolic ones are discontinued, install 2425h diaphragms. This has me wondering:

1) How will the different BL affect the sound? The 2470 motor is 19,000 Gauss and the 2425 is around 17,000.

2) What are phase plug differences and how might that affect the frequency response? 2425 is 800 hz to 20,000.

I understand there are limited options with drivers like these. The drivers were free and in pretty bad shape when I got them, dirty, missing screws and terminals. I cleaned them up and put them aside for years. They've been handy at filling empty shelf space. Its time to do something with them, but it just raises a lot of questions about what the result will be.

Any input would be helpful. Maybe someone who has installed the 2425 diaphragms could chime in.