4435 Diy

[Alex Lancaster]

Giskard, Thanks.

[Hofmannhp]

Originally posted by Ralf
That`s my Explanation:
Air in the glass wool moves more slowly. If you put more glass wool in the box, the air needs more time to the wall and back. It`s the same effect as a longer way, a larger enclousure...
Don`t know, if I am right.
Ralf

ok Ralf,

thats the correct physical definition....the main reason is the longer way for the pressure waves through the wool and back. This is the same like a bigger cabinet. Please don't forget that when using a lot of wool, the efficiency (2 f ??) goes a little less in cause of some energy of the pressure waves goes lost as (little) heat in the wool.

Let's discuss it a little deeper 21st of may
HP

[Guido]

HP does both chambers have the same tuning?
Or in other words is the port exactly the same for both chambers?

Thanks

[4313B]

It would be real nice if someone with a pair of 4435's would measure the actual tuning frequency of each chamber. I'm curious to see what the actual Fb is.

[Hofmannhp]

Originally posted by Giskard
It would be real nice if someone with a pair of 4435's would measure the actual tuning frequency of each chamber. I'm curious to see what the actual Fb is.

Hi Guido and Giskard,
I will of cause do a measurement........short after my pay jobs..
I'm also curious whats the result....
Have to carry some PC stuff to the living room.

Guido: the two chambers are geometricaly the same (as my drawings show) For a fb measurement I will also change the woofer cabeling from the left the right.
A fact is (like Giskard wrote) that the lost volume of the high/mid horn/driver is balanced with the additional fiber in this chamber.
The two ports have the same size.
HP

[sa660]

This should go to the lansing web site for cabinet plans?

Bravo,

[4313B]

Definitely!

Perhaps in a member's plans section.

[Hofmannhp]

Originally posted by Giskard
Definitely!
Perhaps in a member's plans section.

okok,...fine, but please let me complete them before and correct some mistakes.

HP

PS: in cause of a lot of (non JBL) pay work, I hadn't start with the measurements.....sorry

[Guido]

This is my definition of a 4435 crossover

[Guido]

HP, any news regarding the corrections?

Thank you!

[Hofmannhp]

Originally posted by Guido
HP, any news regarding the corrections?
Thank you!

Hi Guido,

I'm workin on them.
But I can tell you, there aren't not that much.
i.e. some bracing woods are a little different and the horn baffle in the main cabinet has no square hole..its a round hole.

maybe tomorrow.....I stored some dwgs in the office.

HP

PS: also the long weekend left his marks.....we had three very long evenings in my living garage with a lot of drinks and a good sound. (you have to try Steve Ray Vaughn's: Tin Pan Alley with good speakers)

[boputnam]

Originally posted by Guido
This is my definition of a 4435 crossover

[Guido]

Originally posted by boputnam

Sure you meant the crossovers

[Figge]

hi great thread! awesome speakers! lets say if i wanted to build these speakers what drivers/horn/xover do i need to get? maybe a schematic on the xover if maybe possible to build yourself.

[Hofmannhp]

Originally posted by Figge
hi great thread! awesome speakers! lets say if i wanted to build these speakers what drivers/horn/xover do i need to get? maybe a schematic on the xover if maybe possible to build yourself.

Hi Figge,

you can get all informations in this forum.
The 4435 need 2 x 2234H, 2426H , 2344 horn and needs a crossover, with 1kHz.
Very special is, that only one of the woofers works in the 100 to 1kHz section. Both woofers work below 100Hz.

HP

[Ian Mackenzie]

I think the extra fibreglass in the enclosure surely helps suppress midrange reflections back though the 2235H.

When I heard John's 4435's in Boulder I was quite surprised by the midrange, smooth and no woofer overhang usually attributed to large driver covering the midrange.

Quite a nifty design actually although I undeniably prefer the 2123H with the 2344a horn after the Robert Hamell audition at Long Island NY, but thats the beauty of diy JBL, roll your own.

Ian

[Guido]

Originally posted by Hofmannhp
Hi Figge,

you can get all informations in this forum.
The 4435 need 2 x 2234H, 2426H , 2344 horn and needs a crossover, with 1kHz.
Very special is, that only one of the woofers works in the 100 to 1kHz section. Both woofers work below 100Hz.

HP

Hi Figge!

Let me try to define HPs post a little for you:

2234H is a rare driver but you can recone a 2225 or 2235 to a 2234. Just keep out the massring
2426H is well known I think. You can also use a 2425H
2344 Horns are extremely rare but they are at german ebay right now. Do a search I do not have the link at hand. But hurry. They have a low Buy it Now!

The crossover can be found at:
http://www.jblproservice.com/pdf/Net...%20Network.pdf

Good luck

[Hofmannhp]

Originally posted by Guido
HP, any news regarding the corrections?
Thank you!

ok....here's the main front baffle.
differences to my first drawing is the hole for the high frequency unit 2344 .

(If the pdf is poor, let me know)

HP

[Hofmannhp]

Hi again 4435 builders,

here's the sub baffle for the high frequency horn 2344 and the L-pads.
changes only the hole for the horn. The horn is mounted on a 1mm thick and 1/2" wide neoprene strip under the edges of the horn.

HP

[Hofmannhp]

Hi again ,

here's the frame and bracing cut for the high frequency horn 2344 and the 2426 driver. If you want to use another driver, pls check the diameter. The driver motor is softly isolated from the frame woods with 1/2" damping material.

HP

[Hofmannhp]

Hi once more ,

here's the bracing top view in the height of the high frequency horn 2344 and the 2426 driver.

HP

(pls give a sign if the pdf is in poor quality, or ask for dwg's)

[Hofmannhp]

Originally posted by Giskard
Definitely!

Perhaps in a member's plans section.

well dear friends,
will be nice.....also for other speakers.

Giskard and Don: you may let me know in which format we can mention about to post the drawings (format and scaling). For this application I think to revise them again...like a DIY kit.

HP

[high123bid]

Thanks for me also, Do you have the full drawings or just the front view, please?

Regards, Bo Andersen

Hi All,

I think it is worth a new thread......

here's the first pic as pdf (also available as ACAD file)
the front view:

HP

[high123bid]

could you post the 4435 ACAD file, please?

Thanks very much, Bo

Hi All,

I think it is worth a new thread......

here's the first pic as pdf (also available as ACAD file)
the front view:

HP

[Hofmannhp]

could you post the 4435 ACAD file, please?

Thanks very much, Bo

Hi Bo,

ACAD Files cannot be posted here as an atachement.
But if you leave me your email adress, I can send it to you.

HP

[boputnam]

And, delete the recently started 4435 construction Thread - it is redundant. Bo Andersen has found his way!

[stevem]

Hi David!

Try the P-Audio PH316. It is very similar to the 2344. PM me for details if you are interested.

Remember this is a 1.5" throat horn. The 2344 has a 1" throat.

[Zilch]

Bo's won the right horns.

http://cgi.ebay.com/JBL-4435-Studio-...QQcmdZViewItem

[Wrong woofers, tho....]

[Uncle Paul]

I understand the difference between the woofers is the mass ring that is installed behind the dustcap. The 2235 has it and the 2234 doesn't. Would it be possible to convert a 2235 to a 2234 with a little dustcap surgery?

[Guido]

I understand the difference between the woofers is the mass ring that is installed behind the dustcap. The 2235 has it and the 2234 doesn't. Would it be possible to convert a 2235 to a 2234 with a little dustcap surgery?

To cut out the dustcaps isn't a problem. To find replacement dustcaps and glue them in isn't a problem either.
There is a small chance that you'll find no mass rings under the dustcaps because maybe the former owner made 2234 out of 2235 cores.
Ok, but what if you find massrings?
I removed massrings with MEK, BUT this is a dangerous work !!!! :shock: The MEK could solve other glue points or you can damage the voice coil or....

But you have nothing to loose. If you want 4435 you need to recone anyway. So try it