Can someone tell me what freq. these crossovers are at? - diyAudio
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Old 4th June 2003, 06:42 AM   #1
JZatopa is offline JZatopa  United States
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Default Can someone tell me what freq. these crossovers are at?

http://www.apexjr.com/speakerstuff.html

The JBL crossovers. I emailed them about the crossovers and here is what I was told.

On all 4 of the crossovers the chokes are not marked, however

The picture with the 2 x-overs have these parts

1 1.2ohm 5W & 37.5ohm 5W resistors 16uf 100Vnp & 20uf 100Vnp electolytics

and 2- 3uf 250V blue poly caps

Other rectangle crossover has the following;

1ea 7.5ohm 5W & 2.7ohm 10W Resistors,1 ea 7 uf 250V blue poly caps & 15uf 100V

electrolytic.

The 2 crescent shaped x-overs both have 6.8uf 100V caps and the larger one has a

3 ohm 7Watt resistor

All 4 have dual gold plated red/black push binding posts

Anyone have any ideas?
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Old 4th June 2003, 06:14 PM   #2
Netlist is offline Netlist  Belgium
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Hi, DJNUBZ
It's impossible to tell with only this info.
From or for which JBL-speakers or box are they?
Do you want to replace them?
Is it for JBL speakers? Home? Pro?
Can't you mail the guys and ask the frequencies curves?
Tell us some more.

/Hugo
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Old 4th June 2003, 06:22 PM   #3
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Quote:
Originally posted by Netlist
Hi, DJNUBZ
It's impossible to tell with only this info.
Yes, we at least need a schematic to reverse engineer them!
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Old 4th June 2003, 08:27 PM   #4
JZatopa is offline JZatopa  United States
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I was looking to use them as a cheap set of crossovers for a home setup for a pair of speakers.

I'll email him if he has a scematic but I have a feeling he doesn't.
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Old 5th June 2003, 06:44 AM   #5
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Default Re: Can someone tell me what freq. these crossovers are at?

Quote:
Originally posted by DJNUBZ
[B]http://www.apexjr.com/speakerstuff.html

The JBL crossovers.
I have traced the circuit on these (3rd order with a zobel across the woof), but haven't had a chance to measure the inductors yet. Once i have i will post the schematic and we can start guessing the XO (which of course is very dependent on the drivers JBL was using) -- Steve will also get a copy -- least i can do for him tossing one in with my last order so i could look at it.

dave
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Old 6th June 2003, 09:55 PM   #6
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It turns out that under each component, the nominal parts value is shown. I confirmed the inductor values and drew up a map.

The values do not correspond to text-book 3rd order filters so let the figuring begin.

dave
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Old 6th June 2003, 09:59 PM   #7
jleaman is offline jleaman  Belgium
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OH wait a minit that is the one that i drew out. now isn't it. GRR. well the one that you drew out in 5 min and me 30 min LOL. Practice make's perfect..

If any one knows about speaker building IT is PLANET10.. ( DAVE )
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Old 6th June 2003, 10:29 PM   #8
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Quote:
Originally posted by JasonL
you drew out in 5 min and me 30 min
I don't think it took me that long

dave
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Old 6th June 2003, 10:31 PM   #9
jleaman is offline jleaman  Belgium
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that is because your a
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Old 10th June 2003, 07:05 AM   #10
JZatopa is offline JZatopa  United States
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anyone have any ideas on these yet?
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