THESE JBL 4425 AND 4430 CROSSOVER SCHEMATICS ARE READABLE

[turnitdown]

I put up an ad to buy 4425 crossovers and had no takers, so a DIYer would say, "Build them."

I did, but had to have readable schematics to go from. I don't have Photoshop so I did it old school.

These are MORE legible than any I've seen. I present them here for posterity. Use these as guides to fill in the blanks from the illegible factory pdfs.

 

[johnlcnm]

Here you go turnitdown:

 

[turnitdown]

Thanks. I have that - I was just adding the ones I made that were actually legible.

 

[johnlcnm]

I pondered over the 4425 crossover when I moded my pair. I subbed the 2206s for the original 2214s. Later I found that JBL actually produced the SR4722As. These were essentially the 4425 with the 2206.

 

[Zonker92]

@johnlcnm, did you like that woofer change?

 

[johnlcnm]

Yes. I had a resonance in the upper mid range, maybe 2kHz - 2.5kHz. Pulled my hair out trying to solve it. Replaced the 2416s with 2426s and Radian diaphragms. Did not solve the problem until I replaced the 2214s with the 2206s. I did build a new crossover for the 2206s. Disconnected the low section from the horn section on the existing crossover. I think the lower mids are better along with no upper mid range resonance. I was going to pass the 4425s on, but they are keepers now. I really like their sound. They don't go as low as the 2214 loads, but bass drums sound really great on the 2206. Oh, and Zonker, thanks for putting together the 4333/L300 crossover boards!

 

[Zonker92]

Cool; thanks for the details!