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