Originally Posted by
Rudy Kleimann
IIRC, Christopher Cross used a pair of 4425's in his studio, may still have them to this day. His first album, released in 1980, had superb sound quality. Still sounds good today IMHO
BTW- do you have a picture of your old driver phase plugs? You said they looked different. If they had 9 round holes in the phase plug instead of the annular slits, yours are probably early 4425's. I think those drivers were actually 2415H's. Diaphragm was not changed- only the part number changed, a la 2446,2447,2450,2451,etc.
Have you compared the crossover network components in your cabinets against the JBL Service exploded diagram? If yours had 2415H (round hole phase plug passages) The HF EQ filter section may be different in your 4425's than what was provided in the later models with 2416H drivers.