JBL 4828

Has anybody got a passive crossover for a JBL 4828 or a wireing diagram for the PCB? I know it's prob a long shott as their either non existant or like rocking horse shit!

" Ben,here is the spec of the cabinet..it crosses over at 800hz,so you could allways subsitute it for a similar passive xover.,as i dont think you will ever find an original."

It is a very special crossover, a standard crossover will not work well.

http://www.jblproservice.com/pdf/SR-Series/SR4722A.pdf

You should either use the SR4722A crossover, or what I used, a 4435 high-pass and a custom low-pass.

http://www.jblproservice.com/pdf/Studio%20Monitor%20Series/4435LR.pdf

IIRC, I used the low-pass from this:

http://www.jblproservice.com/pdf/SR-X%20Series/SR4722X.pdf

 top job, i'll get my iron out!

I hope no one used the 800 hz suggestion in building passive crossovers for 4828s. The horn won't load the driver below 1khz. The SR4722 also uses a smaller version of the Dolly horn and a different ( cheaper ) HF driver and needs to crossover even higher. A search for a JBL 4726 will get you a schematic for a crossover that is the closest match you're likely to get for the 4828 and crosses over at about 1k6 hz. I'd post the schematic but the forum isn't giving me the option for images. The studio monitor 4430 crossover is very hifi but crosses over at 1khz to give the 15" woofer some chance of meeting the HF horn but I wouldn't want to drive a 1" compression driver very hard at that low a frequency and its a bit dubious if the low pass filter would be a good match for the 12" 2204H or 2206H  woofer in the 4828 ( depending on when it was made) Another caveat in using the 4430 crossover schematic is that the HF driver in the 4430 is an 8 ohm 2426J while the driver in a 4828 is a 16 ohm J version.

Edited by Riley Casey - 20 November 2023 at 2:15am