N1200 polarity Question.

[rocks66ss]

I was wondering if I have these correct

LF 1 pos
LF 2 neg
HF 3 neg
HF 4 pos

looking at a schmatic online I believe this is correct. I just need confirmation.

Thanks

Rocky

[Mr. Widget]

Yes, you are correct regarding red and black terminals... as to positive and negative?
JBL was bassackwards back then, so that is anyone's guess.


Widget

[rocks66ss]

Yes, you are correct regarding red and black terminals... as to positive and negative?
JBL was bassackwards back then, so that is anyone's guess.


Widget

I kind of surprised. 98 people have view and one adminastrator has commented. and no one is sure of what I ask.


Rocky

[Riley Casey]

Yes that is what the schematic reads. As to if that is correct in terms of any given speaker system will depend on the drivers in use and the enclosure design. Always best to determine connection polarity empirically unless you are using the crossover exactly as intended by JBL.

I kind of surprised. 98 people have view and one adminastrator has commented. and no one is sure of what I ask.


Rocky

[Mr. Widget]

I kind of surprised. 98 people have view and one adminastrator has commented. and no one is sure of what I ask.


Rocky

Hi Rocky,

I guess my answer was too cryptic. What I was trying to say was that, yes, you are reading the schematic correctly for a N1200 crossover. Additionally I was attempting to point out that when this network was created, JBL's standard for polarity was the reverse of the rest of the industry.

The N1200 was designed to work with one of three woofers and one of two tweeters.

Woofers: D130, D131, or 130A
Tweeters: LE175, or LE85

If you use any other drivers, your results will likely not be what you are hoping for and at this point, it is anyone's guess how your speakers will turn out as many of these vintage drivers have been altered and there is no guarantee that you will achieve the desired results. That said, feel free to experiment.


Widget

[jbl4ever]

Use to be on this site but can not find it in the Library anymore. Google search JBL crossover connections. Look for the site www.cieri.net JBL dividing network instruction manual. It is 8 pgs of crossover info and hook ups. And Widget is right

[Odd]

[rocks66ss]

Hi Rocky,

I guess my answer was too cryptic. What I was trying to say was that, yes, you are reading the schematic correctly for a N1200 crossover. Additionally I was attempting to point out that when this network was created, JBL's standard for polarity was the reverse of the rest of the industry.

The N1200 was designed to work with one of three woofers and one of two tweeters.

Woofers: D130, D131, or 130A
Tweeters: LE175, or LE85

If you use any other drivers, your results will likely not be what you are hoping for and at this point, it is anyone's guess how your speakers will turn out as many of these vintage drivers have been altered and there is no guarantee that you will achieve the desired results. That said, feel free to experiment.

Widget

I built my speakers in the mid 80's actually built from plans for the 5qf boxs found on this site. I use a D130 and LE175 patato masher. I haven't been sure if I had them hooked up correctly until tonight when I read this answer. I found the schematics and was reasonably sure but not 100% I am redoing the insulation in the cabs, when I took the speakers out, Slice Speaker in Kansas City, had reconed my D130's in 97. I have a spare N1200 and I am going to recap it and see how it sounds to one that hasn't been. getting them out of the box looks like a challenge. Any tips on getting them out of that muck, wax, whatever it is.

Thank you for the response.

Rocky Hill

[Mr. Widget]

Would you consider bi-amping your speakers?

If they were mine and I hoped to improve their sound, that’s what I would do. A pair of small amps and a nice new DSP active crossover and you are off to the races.

Alternatively, I would keep them as is. Someone else might invest the time to dig out the networks and recap… plenty have made the investment in time and effort. There are threads here that explain the process.


Widget