Reconing JBL LE5-6 & LE25-2
- Thread starter eizner23
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lrb1951
JBL L110 Nut
Looks like the LE5 recone kit is for the LE5-9 or the LE5-2 not for the LE5-6 and it’s siblings LE5-10, LE5-8 or LE5-12. You might be better off finding good working ones for either one on eBay. The LE25 recone kit page says that it is a very difficult project to recone since the Voice coil leads are very fine. There is a pair of LE5-10s up for bid on the bay. Search for JBL L110.
The only difference between the LE5-6 and the LE5-10 is that the LE 5-6 still has the cast marks on the face whereas the LE5-10 has the brushed face.
Larry
The only difference between the LE5-6 and the LE5-10 is that the LE 5-6 still has the cast marks on the face whereas the LE5-10 has the brushed face.
Larry
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Chris Brown
Super Member
How are you "measuring" the tweeter? Using a multimeter? If so, what you are measuring is the DC resistance, not the impedance. Impedance is an AC measurement, and it changes based on frequency. That is why you see impedance described as "Nominal Impedance" because it's basically an average. You can't measure impedance with a multimeter, again, because it changes depending on frequency. You CAN measure DC resistance with a multimeter, because the current only flows in one direction, there is no frequency component (you could describe it as 0Hz (Zero Hz)).
But DC resistance can still be a useful measurement. It can help determine if there is voice coil damage. You can measure the tweeter from each speaker and compare - if there is a significant difference then that could indicate a problem.
Looking at the tech manual, it shows the acceptable DC resistance range for the tweeter - 3.6-4.4 ohms. That would put 4-ohms right in the middle of that. So it sounds like your tweeter is fine.
eizner23
Super Member
I am looking at this LE25-2 on ebay from L36 decade and he lists and measures it at 4 ohm. I guess there were two versions. LE25-2 dont look the exactly same from front anyways, I am going to suck it up and order the LE25-4.
Chris Brown
Super Member
Acceptable DC resistance range for a LE25-4 is 3.7-4.2 Ohms, so if you are measuring 6-ohms it's possible/probable that your "working" tweeter is damaged somehow.
That's exactly what it should measure at (between 3.6 - 4.4).
4 ohms is exactly what the DC resistance should be for an LE25-2 (between 3.6 - 4.4). What is leading you to believe that there were two versions?
Seems like a risky move if your existing LE25-4 is measuring 6 Ohms DC resistance.
eizner23
Super Member
I questioned this because of the 8 ohm is label on the back, shown in posted image.
The specs which I posted show LE25-2 as 8 ohm, which leads me to think there are two versions.
Chris Brown
Super Member
I questioned this because of the 8 ohm is label on the back, shown in posted image.
The specs which I posted show LE25-2 as 8 ohm, which leads me to think there are two versions.
I typed up an entire post earlier in this thread explaining why Impedance and DC Resistance are two different things. You simply cannot measure Impedance with a handheld meter like you are doing. Impedance can only be measured while the cone & voice coil are in motion, and impedance varies depending on the frequency of that motion. When you measure using a handheld meter like you are doing, what you are measuring is DC Resistance, NOT Impedance. This is what Impedance looks like (not your speaker, just an example):
That is why it's always called "Nominal impedance", because the impedance you see listed is basically an average. In contrast, DC Resistance is a single figure that can be easily measured.
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eizner23
Super Member
Thank you @Chris Brown for pointing out my error- lesson for the day. I will further inspect the working tweeter that is measuring high DC resistance.
