View Full Version : n2400 crossover
05-30-2009, 05:19 AM
I have a question about the n2400 crossover - from what I've seen there is 16 ohm and a 8 ohm versions = from what I've read, the d130's are all 8 ohm... so is the 16 ohm n2400 really 16 ohm? - I'm trying to put together a pair of these to build d130/075 speakers this summer - I thought I had bought a pair in Canada, but the guy never shipped them and kept my money (Ross Mcknight AKA sam r i or fatonesam) paypal recovered a whole $2 from him - anyway if any leads on n2400 pls let me know (the d130's are 8ohm Signatures)
05-30-2009, 06:27 AM
I have a question about the n2400 crossover - from what I've seen there is 16 ohm and a 8 ohm versions = from what I've read, the d130's are all 8 ohm... so is the 16 ohm n2400 really 16 ohm?
My D130s are labeled 16-ohm and use N2400s. There's been much discussion here about the actual impedance of the D130. I believe Harvey may have said they were all the same, regardless of label. If you check the brochures in the library, up to around 1966 the D130 and the N2400 were rated 16-ohm. From about 1969-on both were rated 8-ohm. I assume they are the same, regardless of label. :dont-know
05-30-2009, 06:42 AM
This should not be an issue...AFAIK JBL changed the nominal impedance ratings on drivers such as the D130 from 16 ohm to 8 ohm, however the actual impedance remained the same, unless you are talking about early models which where rated at 32 ohms. Here is the N2400 schematic if it may be of use to you: note that the test setup used an 8 ohm load for standardization.
05-30-2009, 01:39 PM
The best I can find right now is a one 8 ohm and one 16 ohm crossover - It look like there are some inexpensive JBL crossover with L-pads (crossed at 2.5 khz) that I could buy to hold me over until originals show up - I might even go the parts express route and make my own (would be first time doing a crossover) - I was looking at the c34 plans in the library ....
06-01-2009, 11:39 AM
Baron030 did an excellent thread on the The N2400 Revealed. He basically refurbished an old N2400 crossover. I followed his lead and procured two used N2400 cerossovers on e-bay and refurbished them with new capacitors from Parts Express. By the time I was finished, it cost no more than if I had bought all new parts from Parts Express, plus I had the extra-plus of having a JBL crossover that matched my JBL speakers. My advice - by the time you buy a circuit board, terminal connectors, faders, capacitors, inductors - it's much nicer and easier to just get some used N2400 crossovers and replace the capacitors.
06-01-2009, 03:04 PM
If you are going to build all new N2400 networks from scratch, then consider updating the original design to include charge coupling and bypass caps as well. Here is a revised schematic:
06-03-2009, 02:05 PM
Do you think the bypass capacitors on the LF really make that much of a difference? JBL never seemed to think the D130 speakers needed a bypass capacitor.
06-03-2009, 03:16 PM
You are probably right about not making a lot of difference in bypassing the LF part of the network.
But, it is not without precedence in JBL history.
Here is a link to a Bypass Cap thread:
Notice that the second generation N110A network as used in the JBL Model L110A 10-inch 3-way bookshelf loudspeaker system has a bypass cap for its woofer.
So, that is why I included bypass caps on the low pass part of the revised N2400 schematic. Now, if it was me building this circuit, then I would use cheap Dayton Film and Foil Polypropylene bypass caps for the D130 and then use the savings for some more expensive bypass caps for the 075. (Audio Cap Theta Poly Film, for example)
Now, there is one thing that will really improve sound of the D130 when used with a stock N2400 network. And that is replacing the small 20ga iron core coil with something better. Either a larger iron-core coil or better still a heavy gauge air-core coil. :yes:
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