4355 evnts plans

[frablake]

Hello,
Is there anyone who couls give me the events plans for 4355, Please.

Regards
Francis

[speakerdave]

I'm not sure what you mean. Construction drawings?

[frablake]

I'm not sure what you mean. Construction drawings?

Yes if you have them!

[speakerdave]

Here they are:

http://www.audioheritage.org/vbullet...highlight=4350

[frablake]

Here they are:

http://www.audioheritage.org/vbullet...highlight=4350

Lot of thanks, but i don't understand the real size of the events lengh. I have just bought a JBL 4355, but they are in very bad condition. Events are destroyed...Could you explain me how i can make them, in what material, and exactly what are the sizes???

Kind regards
Francis

[Odd]

All measurements are in the drawing, in inches.
1 inches = 2.540cm
You can build with plywood or MDF.

[frablake]

All measurements are in the drawing, in inches.
1 inches = 2.540cm
You can build with plywood or MDF.

On this pic: I have not the size of the events! Have you more details about them! Lengh, etc

[ivica]

On this pic: I have not the size of the events! Have you more details about them! Lengh, etc

Owing to the JBL info :
http://www.jblpro.com/pub/obsolete/4355.pdf

that 4355 internal volume is about 265Lit ( 9.5ft3), and that tuning frequency is 32Hz, it seems that for 5"3/8 tube mean length would have to be about 6"3/8, but looking at the presented figure, it seems to me that they are over 11" in length, but if box is tuned on about 27Hz, then the ducts length would be about 11"1/2
Regards
ivica

[Odd]

Ok, the length of the duct, port.
Can not find the exact measurements, but you can find more info here

Use Google to search the forum.
site: audioheritage.org jbl ......

On this pic: I have not the size of the events! Have you more details about them! Lengh, etc

[yvonf]

Hello JBL lovers

By the way I am looking for the same information.....

And the answer you gave here is NOT correct (sorry...) : in the 4355 the duct port is NOT vertical mounted ; so the appreciation on a (little) plan isn't so efficient... despite we have also a front view which should "theoricaly" trigo-solve the problem, but in this case the precision would be "pour le moins fantaisiste"... - I did it !

(I send also PM to Rick-Saeman but no answer... holidays ?)

Anyway :

It's an old dream for me to have these 4355.... and, until I have the "correct" house, I start one month ago, to modelise in 3D this fantastic monitor with "SolidWorks" and to complete that job (very big job - I already spend on it an hundred "holidays hours"... ), I need a bunch of details...

Here they are :

- thickness of the bafle (3/4 like 4350 or 1 like other main panels ?)
- list of panels with rockwool (all ? outside mid-bass box ? behind bafle ?.....)
- bolts standart (UNC, UNF, SW, BSF, .......) (*)
- RVB informations for blue of the bafle, grey of the compression stuff (ex : 2311) and "blue-grey" of the grille tissus....
- name (or the more similar) of the JBL font (used for label - not for the sigle)
- and of course : the duct port !!!!

For this last, the needed informations are :
1st - angle (just one ? - on the original technical doc, it appears have two...)
2nd - lenght of the first part
3rd - lenght of the second
The sw calculate all the dependant ! "très pratique" !!! )
- insertion lenght in the bafle

exemple :




Rem : Well understanding, the lenghts and angle describe in this picture are only aproximate deductions from pictures ....

And to prove the reality of my work that I will - of course - give to this forum (up it's complete... ), some exemples :

The famous duct port :





A partial 3D view of the monster :




Rem : the JBL logo on the 2441 support is just to test "stamp" on a piece (actualy, i learn this sw... and I'm not a specialist but "je me soigne !" )

Anyway, it's amazing ! Imagine : you can move around, see inside, light some parts......

SO gentlemen PLEASE - PLEASE - PLEASE, answer .....

French and best regards

Yvon

(*) : Anglosaxons should consider ISO.......

[frablake]

Owing to the JBL info :
http://www.jblpro.com/pub/obsolete/4355.pdf

that 4355 internal volume is about 265Lit ( 9.5ft3), and that tuning frequency is 32Hz, it seems that for 5"3/8 tube mean length would have to be about 6"3/8, but looking at the presented figure, it seems to me that they are over 11" in length
Regards
ivica

Thanks..i understand you, but i would like to know the right angle between the two tubes, and the right lengh of each other.
I was quite amazed when i have looked into the cabinet, by the event form!!!

[frablake]

Hello JBL lovers

By the way I am looking for the same information.....

And the answer you gave here is NOT correct (sorry...) : in the 4355 the duct port is NOT vertical mounted ; so the appreciation on a (little) plan isn't so efficient... despite we have also a front view which should "theoricaly" trigo-solve the problem, but in this case the precision would be "pour le moins fantaisiste"... - I did it !

(I send also PM to Rick-Saeman but no answer... holidays ?)

Anyway :

It's an old dream for me to have these 4355.... and, until I have the "correct" house, I start one month ago, to modelise in 3D this fantastic monitor with "SolidWorks" and to complete that job (very big job - I already spend on it an hundred "holidays hours"... ), I need a bunch of details...

Here they are :

- thickness of the bafle (3/4 like 4350 or 1 like other main panels ?)
- list of panels with rockwool (all ? outside mid-bass box ? behind bafle ?.....)
- bolts standart (UNC, UNF, SW, BSF, .......) (*)
- RVB informations for blue of the bafle, grey of the compression stuff (ex : 2311) and "blue-grey" of the grille tissus....
- name (or the more similar) of the JBL font (used for label - not for the sigle)
- and of course : the duct port !!!!

For this last, the needed informations are :
1st - angle (just one ? - on the original technical doc, it appears have two...)
2nd - lenght of the first part
3rd - lenght of the second
The sw calculate all the dependant ! "très pratique" !!! )
- insertion lenght in the bafle

exemple :





And to prove the reality of my work that I will - of course - give to this forum (up it's complete... ), some exemples :

The famous duct port :





A partial 3D view of the monster :




Rem : the JBL logo on the 2441 support is just to test "stamp" on a piece (actualy, i learn this sw... and I'm not a specialist but "je me soigne !" )

Anyway, it's amazing ! Imagine : you can move around, see inside, light some parts......

SO gentlemen PLEASE - PLEASE - PLEASE, answer .....

French and best regards

Yvon

(*) : Anglosaxons should consider ISO.......

Sublime travail, bravo...où puis je "visiter" cette merveille, sur quel site web ou avec quel logiciel.

Avez vous des infos plus précises quant à la réalisation des évents? il semble que non...mais si oui, je suis preneur...

Encore mes félicitations pour votre travail

Francis

[frablake]

Hello JBL lovers

By the way I am looking for the same information.....

And the answer you gave here is NOT correct (sorry...) : in the 4355 the duct port is NOT vertical mounted ; so the appreciation on a (little) plan isn't so efficient... despite we have also a front view which should "theoricaly" trigo-solve the problem, but in this case the precision would be "pour le moins fantaisiste"... - I did it !

(I send also PM to Rick-Saeman but no answer... holidays ?)

Anyway :

It's an old dream for me to have these 4355.... and, until I have the "correct" house, I start one month ago, to modelise in 3D this fantastic monitor with "SolidWorks" and to complete that job (very big job - I already spend on it an hundred "holidays hours"... ), I need a bunch of details...

Here they are :

- thickness of the bafle (3/4 like 4350 or 1 like other main panels ?)
- list of panels with rockwool (all ? outside mid-bass box ? behind bafle ?.....)
- bolts standart (UNC, UNF, SW, BSF, .......) (*)
- RVB informations for blue of the bafle, grey of the compression stuff (ex : 2311) and "blue-grey" of the grille tissus....
- name (or the more similar) of the JBL font (used for label - not for the sigle)
- and of course : the duct port !!!!

For this last, the needed informations are :
1st - angle (just one ? - on the original technical doc, it appears have two...)
2nd - lenght of the first part
3rd - lenght of the second
The sw calculate all the dependant ! "très pratique" !!! )
- insertion lenght in the bafle

exemple :





And to prove the reality of my work that I will - of course - give to this forum (up it's complete... ), some exemples :

The famous duct port :





A partial 3D view of the monster :




Rem : the JBL logo on the 2441 support is just to test "stamp" on a piece (actualy, i learn this sw... and I'm not a specialist but "je me soigne !" )

Anyway, it's amazing ! Imagine : you can move around, see inside, light some parts......

SO gentlemen PLEASE - PLEASE - PLEASE, answer .....

French and best regards

Yvon

(*) : Anglosaxons should consider ISO.......

En fait je trouve qu'il y a déjà beaucoup d'informations ...peut-on s'envoyer des MP?

[speakerdave]

JBL has long been tight-lipped about the details of the port ducts in its cabinets. For one thing, they were not particularly interested in having the cabinets replicated while the speakers were in production. A more important reason now is that in a DIY cabinet many if the details of construction will vary from the factory version, and these variations may affect the length of duct needed to achieve the desired tuning. In other words, it is very likely your cabinets will need to be individually tuned. Still, it is desirable to know as many of the details as possible, so what is needed here is for someone owning a pair of factory cabinets to make some careful measurements and post them here just as has been done with the 4345, 4333, 4430 and others. Perhaps a forum member who has a pair can take the time.

[ivica]

JBL has long been tight-lipped about the details of the port ducts in its cabinets. For one thing, they were not particularly interested in having the cabinets replicated while the speakers were in production. A more important reason now is that in a DIY cabinet many if the details of construction will vary from the factory version, and these variations may affect the length of duct needed to achieve the desired tuning. In other words, it is very likely your cabinets will need to be individually tuned. Still, it is desirable to know as many of the details as possible, so what is needed here is for someone owning a pair of factory cabinets to make some careful measurements and post them here just as has been done with the 4345, 4333, 4430 and others. Perhaps a forum member who has a pair can take the time.

Interestingly to say, for the JBL model 4355 internal volume (265Lit) and the tuning frequency (32Hz) were given in the:
http://www.jblpro.com/pub/obsolete/4355.pdf

but from the most of the DIY people that have a "contact with" the original seems that tuning frequency is about 27Hz, even though that with 32Hz tuning calculated response is 'flatter' and -3dB point is lower then tuning of about 32Hz. I believe that in the room 27Hz tuning would give lower response.