N2400 Question

[S20RVERT]

I have two N2400's that I picked up on E-Bay and was lead to believe that they were 16 ohm. I used one of them on a 2427J (16 ohm) center
channel and it sounded OK. My question is how can I verify that they are 16 ohm as alot of the schematics show N2400 as 8 ohm. I don't want to take the case off to check if I don't have to. This sort of question may have been posted before but I have not seen it. Thanks

[Baron030]

From my understanding, the N2400 crossover has always been made an 8 ohm impedance crossover. And it was the N2600 crossover that was for 16 or 32 ohm systems. But, then again I could be wrong. Someone like Harvy Gerst would know for sure.

Without opening the case, I can only think of 3 ways of knowing absolutely for sure.
1. You could research crossover’s serial numbers to determine approximately when it was made. Start by posting the crossover’s serial numbers here.

2. If you have a VOM or digital multi-meter. You could measure the resistance across the HF output terminals and take two measurements. One with the L-Pad set at its maximum position and the other at its minimum position. And then you post your results here. Someone at this site could compare your measurements to the output of an 8 ohm or 16 ohm L-Pad. And could tell you if you have an 8 or 16 L-Pad within your crossover networks.

3. Or if you have an inductance meter, you measure the inductance of the LF series coil. This could be done by measuring across an input terminal and an LF output terminal. Depending on inductance measured, it could be possible to determine which impedance the network was designed for.

Baron030 :)

[S20RVERT]

Thanks for the reply Baron030. The serial numbers are 22846 & 22868. I'll try the meters ( I have an old Allied analog!?!) and see what I get. Maybe I'll go buy a digital meter, at last, to verify.

[Baron030]

After snooping around the Serial Number Registry, I turned up some N2400 crossovers that have serial number that are not too much higher then yours.

So, it looks like JBL made a 16 ohm version of the N2400 and that your crossovers could be 16 ohms after all.

Link: http://audioheritage.org/vbulletin/showthread.php?p=171924&highlight=N2400#post171924

Baron030 :)