jbl 4343 clone

[gusss]

to start a greeting from Italy to all the members of this forum and best wishes for a good 2022, I apologize in advance for my English but I'm using a translator unfortunately I don't know English :-( I hope you have patience with me.
I write in this forum to ask for help regarding my intention to clone the jbl 4343 studio monitors, I would like to be able to build them exactly the same in sizes and finishes if possible, the information is about the components in my possession of a pair of 077 a pair of 2420 h with relative horns a pair of e 110s and a pair of 2226h, I know that the 4343s use the 2405s as tws and not the 077s but I believe that these are equivalent while I know that they absolutely fit two 2121hs as 10 "instead of my E110s and I know that they mount 2235s instead of my 2226s, now the question is could I replace my e110s with easily available 2123s, or is it possible to recon my E110s with 2121 re-coning? can anyone give me some help regarding this first question? the second question is could I use my 2226 using the same volume and the same cabinet as the 2235 maybe varying only the length of the Reflex ducts? if I could do this in case of finding a pair of 2235 should i just replace the ducts by making them a different size in length is it possible to use the 2235 re-coning on the 2225 baskets?
does anyone have the detailed construction plans of these cabinets? on the net I find only the measurements and detailed construction plans of the 4344,4345
I close by thanking you very much for your patience with me and a good year 2020 greetings from Italy

[Mr. Widget]

Welcome to the Lansing Heritage forum.

The 077 is functionally and exact replacement for the 2405. The only difference is cosmetic. Don't worry about the impedance rating, there is much confusion regarding the impedance, but regardless of what is printed on the driver all 077s and 2405s have the same impedance as long as you have the original diaphragms installed.

The E110 is the exact frame and motor as the 2121H, so if you can find a pair of proper 2121H recone kits you can adapt your mid bass drivers to the proper spec.

If you have 2225H baskets, you can recone them to 2235Hs, you can not modify a 2226 to become a 2235H.

If you keep your 2226H woofers, they will never perform the same as the 2235Hs. I would try to get a pair of 2235Hs for your project or get a pair of 2225Hs reconed with 2235 kits. Other people are happy with the 2226Hs. If you keep the 2226H woofers, you will need to decrease the cabinet volume and change the tuning.


Widget

[gusss]

[CITAZIONE=Sig. Widget;439713]Benvenuto nel forum Lansing Heritage.

Thank you very much for your reply Widget, yes I also thought not to replace the Tws because I think they are the same you have 2405, and good news that you have given me regarding the E110 the possibility of reconing with the 2121
, take advantage of your knowledge about it to ask you a question and are there still original reconings on the market for 2121h? or are there any valid aftermarket?
I disturb you again for a question, where can I find the construction plans of the 4343 cabinets? Is there any site where to download them? As I wrote I only found the detailed construction plans of 4344/4345 but the 4343 no
PS I think I will dedicate myself first of all to the construction of the cabinet and in the meantime I am looking for two baskets of 2225 to replace the reconings with 2235h
I salute you and thank you very much for your answers
I enjoyedgustavo

[Robh3606]

[CITAZIONE=Sig. Widget;439713]Benvenuto nel forum Lansing Heritage.

Thank you very much for your reply Widget, yes I also thought not to replace the Tws because I think they are the same you have 2405, and good news that you have given me regarding the E110 the possibility of reconing with the 2121
, take advantage of your knowledge about it to ask you a question and are there still original reconings on the market for 2121h? or are there any valid aftermarket?
I disturb you again for a question, where can I find the construction plans of the 4343 cabinets? Is there any site where to download them? As I wrote I only found the detailed construction plans of 4344/4345 but the 4343 no
PS I think I will dedicate myself first of all to the construction of the cabinet and in the meantime I am looking for two baskets of 2225 to replace the reconings with 2235h
I salute you and thank you very much for your answers
I enjoyedgustavo

If you have working E 110's you might want to try changing the dust cap from aluminum to paper. That should help tame the high frequency rise and if you have measurement capability you can do a temporary test baffle with a .5 cubic ft sub-enclosure. The fill should fill the sub-enclosure and you experiment with density. That will tell you what the low end response would be.

http://www.audioheritage.org/vbullet...p?10635-E110-8

You could also use a 2123 with the 4344Mk 2 crossover. You would have to change the attenuation as the 2226's have higher sensitivity that the standard bass driver. The 4344 Mk 2 uses a charge coupled network. You can convert to a standard network if you want.

http://www.audioheritage.org/vbullet...php?29742-2123

Rob

[Odd]

The only drawings I have seen for 4343 are baffle drawing;

[gusss]

[QUOTE=Robh3606;439718]Se hai E 110 funzionanti potresti provare a cambiare il cappuccio antipolvere dall'alluminio alla carta. Ciò dovrebbe aiutare a domare l'aumento delle alte frequenze e, se si dispone di capacità di misurazione, è possibile eseguire un deflettore di prova temporaneo con un sottoinvolucro di 0,5 piedi cubi. Il riempimento dovrebbe riempire il sottorecinto e si sperimenta con la densità. Questo ti dirà quale sarebbe la risposta di fascia bassa.

http://www.audioheritage.org/vbullet...p?10635-E110-8

Potresti anche usare un 2123 con il crossover 4344Mk 2. Dovresti cambiare l'attenuazione poiché i 2226 hanno una sensibilità maggiore rispetto al driver dei bassi standard. Il 4344 Mk 2 utilizza una rete ad accoppiamento di carica. Puoi convertire in una rete standard se lo desideri.

http://www.audioheritage.org/vbullet...php?29742-2123

Rob [/CITAZIONE]
thank you very much I will try to replace the aluminum dome on my E110 and let's see what difference it will have
thanks also for the Crossover scheme
Very nice
gusss

[gusss]

Gli unici disegni che ho visto per il 4343 sono disegni baffle;

thanks for the design of the baffle, but this is the only thing that I was able to find on the net too, but all the other measures of the cabimet are missing, the depth the rear, the reinforcements inside. of the 4344 there are the complete construction plans and detailed I thought existed on the net nache of this 4343Many thanks anyway very kind of you thanks
gusss

[Robh3606]

Hello Guss

As Mr. Widget says if you use 2226's you are potentially going to need a smaller box. You can certainly use the 4344 box as a baseline. Do a simulation of the 2226 in about 5-5.5 Ft should get you close. Don't forget you need to subtract the sub-enclosure and drivers and bracing from the volume so the boxes may end up a bit larger than you think.

I have built 4344 clones and the biggest difference, aside from driver, is the layout of the 4343 allowed for the upper driver panel to be rotatable for side placement/soffit mount. Do a search there are lots of 4343 builds here.

Lots of info in Heathers thread here"

http://www.audioheritage.org/vbullet...erences-Thread


Rob

[gusss]

many thanks Robh 3606 very kind in giving me this information
Rob [/QUOTE]

[gusss]

good morning I ask you another courtesy, do you think using the front baffle of the 4343 I can use the construction plans of the 4344 obviously those concerning the depth and the internal reinforcements? last question this and as a survey because I still have some indecision, if you were to make a clone which would you choose obviously for musicality and performance, between 4343/4344/4345? I ask because I still have time to change the project and I would have the possibility to recover 2 2245 thanks in advance of the answers

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Rob [/QUOTE]

[Odd]

4345
http://www.audioheritage.org/vbullet...5-quot-Project

[christo]

good morning I ask you another courtesy, do you think using the front baffle of the 4343 I can use the construction plans of the 4344 obviously those concerning the depth and the internal reinforcements? last question this and as a survey because I still have some indecision, if you were to make a clone which would you choose obviously for musicality and performance, between 4343/4344/4345? I ask because I still have time to change the project and I would have the possibility to recover 2 2245 thanks in advance of the answers

If you have the space and can find a 2245 build the 4345, the overall sound is more open and effortless than the 4344. The bass response from the 2245 is far superior to the 2235. I have built both the 4344 and the 4345. Building these type of speakers takes a lot of time, effort and money. In hindsight I wish I had built the 4345 first but at the time I could not find a 2245.

[Robh3606]

Hello Guss

If you have the room I would go for the 2245 it's just a "BIG" box. I considered that when I built my 4344's and I just didn't have room for something that large between placement, room size and portability. My 4344 are on wheeled stands for that reason.

Since you are scratch building if you don't feel the need to build an exact clone I have used 2" 1/4 rounds in my last 2 builds. They help with edge diffraction and make for very solid cabinet. Here is a picture so you can see exactly how they work. You can see them finished in my avatar.

Rob

[gusss]

thank you christ for your advice, the only thing that stops me from building the 4345 is the problem of listening volumes, I would not like to have a good listening I have to increase the volume exaggeratedly to make them give a good sound, I have already built two speakers with 2226h / 2440/2390/077 the problem was that to have a good sound I had to increase the volume a lot and I would like not to repeat this problem for your experience, advise me?

[gusss]

thank you for your intervention Robh 3606, unfortunately my room is not large and 3.5 meters by 4.5, I have already built as I said in the previous post two monitors with JBL components and they also sounded good but I had to turn up the volume a lot to have presence in the bass at a low listening level I did not have the completeness of the sound I would not like using an 18 "woofer to find myself in this situation again
gusss