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dino
03-31-2008, 08:12 AM
I am building a jbl 4345 and I sent this guy the orginal jbl 4345 xover plans.

http://www.jblproservice.com/pdf/network%20schematics/3145%20network.pdf

his question to me is This xover can be greatly simlified, for example in the LF section the four 20uf caps in parallell are equivalent to a single 80uf why is this network not reduced ?.

I told him I want to use updated poly caps , bigger coils etc but to keep everything in spec as jbl plans stated.

any more advise on the xover will help me out big time thanks
Mr. Widget
03-31-2008, 08:18 AM
The cap question isn't the question he should be asking. The real issues are the tapped autoformers. He will not be able to build you a proper network from that schematic since it uses specialized parts that are NLA.

If you search, you will find the info needed in the various threads posted here... or perhaps a 4345 guru will step forward with some help.


Widget
dino
03-31-2008, 08:37 AM
The cap question isn't the question he should be asking. The real issues are the tapped autoformers. He will not be able to build you a proper network from that schematic since it uses specialized parts that are NLA.

If you search, you will find the info needed in the various threads posted here... or perhaps a 4345 guru will step forward with some help.


Widget Thank u this is why I am asking becuse I want this project to be right
Chas
03-31-2008, 08:49 AM
Not a guru, but I think all the info you need is below. Check out post number three here:

http://audioheritage.org/vbulletin/showthread.php?t=16967&highlight=4345

If you're going through all the effort to build a pair, I would highly recommend you build the charge coupled network.

By the way, the LF and a few MF network components could be eliminated if you go bi-amp only. This is also highly recommended.
dino
03-31-2008, 09:23 AM
Not a guru, but I think all the info you need is below. Check out post number three here:

http://audioheritage.org/vbulletin/showthread.php?t=16967&highlight=4345

If you're going through all the effort to build a pair, I would highly recommend you build the charge coupled network.

By the way, the LF and a few MF network components could be eliminated if you go bi-amp only. This is also highly recommended.
biamp is the only way I am going. I sent ds sounds the charge coupled xover plans I hope its the right info. thanks dino:applaud: