Hello,
so I've decided to build a pair of 4430's. I've found a set of drawings in an old (1984) German DIY electronics magazine, but I've also found out that they cannot be right. The main difference appears to be the phase correction baffle, which in my drawings is flush with the main baffle's upper edge, whereas it can clearly be seen in videos etc. that the original horn baffle is flush with the enclosure's upper panel. Do there exist detailled drawings anywhere?
And I've also found out that JBL used three different HF drivers during the 4430's production run, starting with 2421's, then swapping for 2425's, and finally for 2426's. Did they also modify the xover networks? I have the circuitry for the 2421's only. And are there major sonic differences between the three drivers?
Best regards!