2234 recone kit in E 145 baskets

[MoD]

Hi, I could negotiate a pair of E145 drivers. Condition is still unknown. If they are in need for recone, could they be reconed with 2234 recone kit? I would then measure new T/S parameters and build suitable enclosures.
Thanks...

[Robh3606]

To make the kits fit you would have to take off the extension rings on the frames. Then you have the issue with if the VC will be centered. The gap height is much bigger the E-145 has an underhung coil. Just get a pair of frames that match the 2234. There are plenty of them. If you look at the "JBL What goes Into" it's a flat out no.

Rob

[Eaulive]

Yup, what he said :-D

[MoD]

So...Time fly...I have changed a lot of ideas of what to do with those speakers. In some point I was playing with idea to buy this aftermarket recone kit;https://reconingspeakers.com/product...recone-kit/and to make make extension rims myself to accommodate those recone kits, but that is a very long shot....So to cut this never ending story, I think, I am going to buy one of these recone kits;https://reconingspeakers.com/product...le15a.htmlWhat do You think, which one? They look the same to me, both with wrong alluminium ribbon wire, instead copper...

[MoD]

At Last... I Ordered LE 15A recone kits from Speaker exchange page. ( https://reconingspeakers.com/product...et-recone-kit/ ) for my E 145 baskets. They clame, that voice coil is wounded with coper edgewound wire, so mms should be ok. They allso claim that provided spider is stiffness C, so medium stiffness. Is that right stiffness for LE 15A spider?

[MoD]

They are home.

They are also hommage to fix it what You have laying around. The best are spiders. They are from some huge speaker, because they do not fit in the frame and surface that should be glued is protruding on the sides. One who put this together simply glued one convenient lower part of the roll.

But they are working. I will play a little bit with them until i buy some recone kits.
f
Speaking of recone kits, SoundSpeakerRepair closed permanently. I have their D130 kits which I find good. I have found post where one member of this forum stated that he had to recone one of two his LE15 and couldnt hear the difference.

Such a shame. I was looking for other LE 15 recone kits and it seems all of them have aluminum wire instead of copper voice coil.

Does anybody maybe have a two E 140 extension rings to spare?

[MoD]

I think if recone kit is not one of drop in ones but comes in peaces voice coil could be centered.

Drivers that I ask about are already missing extension rings and were reconed with good knows what. I will offer small amount of money for them and let him be... If he will not be able to sell them, maybe he will turn to me...

[Eaulive]

I don't know what it has been reconed with, but that surround is like nothing I saw in JBL so far AFAICR. Very weird.

I would be curious to have a measurement of the top plate thickness of the E-145... can't seem to find that data anywhere.
You think you could measure that and share it with us?

[Earl K]

I don't know what it has been reconed with, but that surround is like nothing I saw in JBL so far AFAICR. Very weird.

I would be curious to have a measurement of the top plate thickness of the E-145... can't seem to find that data anywhere.
You think you could measure that and share it with us?

The The E-145 has the same magnet assembly and voice coil as the LE-15. The gap is 0.600" long and the coil is .280 long. We didn't pay much attention to x-max back then and there wasn't a standardized method of stating it. Usually transducer would mechanically bottom out (spider to top plate) before a realistic excursion had been reached. This was due to our having to reuse old frames rather than tool new ones. The frames were designed in the 30 watt tube days and were sufficient for the times. As amp power went through the roof, the frames didn't keep up. It was mid 80's or so when the frames got the necessary travel capability.

Back to the E-145. The fringe flux on that motor allowed the coil to come out of the gap by maybe 20% of its 0.280 length which is 1 mm plus a little. Including the coil gap numbers I get about 5.5mm peak. 7 mm is way high (or low if it was p-p). That particular surround was very stiff and was limiting by the time the coil tries to get out of the gap.

it was designed for bass guitar use, quite often in an open back enclosure. This is why it is stiff and able to protect itself. As I recall, it was quite efficient, running in the mid to high 90's for a 2.83 v input.

That quote from GT resides within JBL E145 Excursion Capabilities



To round out todays' info dump, there's a bunch of good info on the K145 + E145 found within Niklas's thread called The Purpose of the E145 ??

[Eaulive]

Thanks Earl K. I read the thread "the purpose of E145" this morning before posting and I don't think I saw that info, I must confess that I read it in diagonal
So a gap of 15.2mm and for the 2234 a coil length of 19.1mm, that does not give you too much excursion available _assuming_ the coil is centered, which is most certainly not.

[Mr. Widget]

I believe an E145 without the extension ring is going to be closest to an LE15H. You might want to go that route.


Widget

[RMC]

MoD,

RE "LE 15 spider has (I think) less stiffer spider"

True, but it applies to spider and surround. The LE15A Vas parameter of 736 L represents a large volume of air and as such it is more compliant (the opposite of stiffness), compared to a smaller Vas number leading to a stiffer suspension.

So that data gives an indication about a woofer's suspension (more or less flexible), plus it is also used to determine the proper box volume for a speaker, along with the driver Qts.

Richard

[RMC]

MoD,

RE LE15A recone in E145 basket

I don't intend to rain on your project, i assume you know what you are doing and the risks involved.

This is a "unorthodox" mix you are trying to achieve, but if you can make it fit and work correctly great for you.

Since these are aftermarket recones there's a possibility the tolerances might be less than perfect? Anyway you're on your own for such recone job.

Good luck.

Richard

[MoD]

RMC, I know.But, original E 145 kits can not be mounted any more on my speakers because they are missing extension rings. I was contemplating diy extension ring, I was even given measurements (on this site) but, necessary thickness aluminium plate can be bought here only in 2m x1m dimenssions and cost 800 euro. I was thinking buying square rod, and machine bend it to circle of appropriate diameter, weld it and then machine it, but there is no such machine in my town...So, only plausible way to go is try to fit LE15 recone kit. LE 15 shoul have mms about 97 grams, and E147 about 55 grams. And aftermarket recone kit... who knows..., I will weight them upon arrival, and then will decide what next;Flux density in both LE15 and E145 is similar, LE 15 has lover Fs, but wont play as high as E145. LE 15 spider has (I think) less stiffer spider, so even if aftermarket recone kit will have mms between 55 and 97 grams, that will be ok, because it will produce speaker with caracteristics between those two speakers, and one can work with that. I think so any way...Thank for thumbs up, it will be needed :-)

[1audiohack]

The last batch of 2234/2235 kits I got in 2019 had the top of the formers up just enough to touch the dust cap.

Naturally you find these things after the kits are all installed so trimming would be much harder. I took a different option.

That said I imagine that there is likely enough former height to move the coil down in the cone and spider in an unassembled kit if you wanted to try that.

Barry.