4435 Diy

[Guido]

Perfect Work!

Thanks again!

[Ralf]

I would have wished myself, I would have such a thing received for my 4430...



Ralf

[Hofmannhp]

Originally posted by Ralf

I would have wished myself, I would have such a thing received for my 4430...
Ralf

thanks guys,

I know what you mean...I had only a brochure from the new 4333B in the year 1979, to take the size and look for my DIY versions. Thats why they are not exact in size, but they look great and sound great.

HP

PS: some drawings from yesterday have little mistakes in measurements, as I found out (bracing, grille and baffle). I will post new versions when ready. So..... switch off the desk saw.

[Guido]

Originally posted by Hofmannhp
PS: some drawings from yesterday have little mistakes in measurements, as I found out (bracing, grille and baffle). I will post new versions when ready. So..... switch off the desk saw.

I'll anyhow do some modifications. Especially the wall junctions will be different and thus will have different measures.
Do you think it will bring advantages to enlarge the cab a bit. I don't think the cabs will reach the specified 5 quft.

[Hofmannhp]

Originally posted by Guido
I'll anyhow do some modifications. Especially the wall junctions will be different and thus will have different measures.
Do you think it will bring advantages to enlarge the cab a bit. I don't think the cabs will reach the specified 5 quft.

Hi Guido,
the original cab has 4,923 qft/chamber without subtraction of bracing and speaker volume. I think those volumes are virtualy compensated by the 1" fiber wool, which covers all inside surfaces except the baffle.
I think there's no problem to vary the cab.....there are some points to do a little optimizing.
When doin the measurements, I scratched my head sometimes, how they assembled the cab, cause all the walls have been put together at first.....and then the bracing....



HP

PS: If it's a project for me, I would try to copy it 1:1 in detail.

[4313B]

"I think those volumes are virtualy compensated by the 1" fiber wool, which covers all inside surfaces except the baffle."

Yes, there should also be a bit extra fiberglass in the chamber with the horn/cd. Can you please measure the tuning frequency of each chamber HP?

Thank you very much for the drawings.

[Hofmannhp]

Originally posted by Giskard
"I think those volumes are virtualy compensated by the 1" fiber wool, which covers all inside surfaces except the baffle."

Yes, there should also be a bit extra fiberglass in the chamber with the horn/cd. Can you please measure the tuning frequency of each chamber HP?

Thank you very much for the drawings.

Giskard->
your absolute right.....in the horn chamber, there's a lot more fiberglass....I will post some pics soon.

HP

[Hofmannhp]

Originally posted by Hofmannhp
Giskard->
your absolute right.....in the horn chamber, there's a lot more fiberglass....HP

here's the first pic.
View through the woofer hole under the horn upward.
You can see the front to back bracing, which also holds the driver magnet. This construction is not yet in my drawings.
HP

[Hofmannhp]

Hi all,

here's a pic with the sidewall bracing near the duct. Fiber is lighly lifted to see the bracing 3" x 1".
HP

[Hofmannhp]

Hi again,

here's a pic with the bottomwall bracing under the right woofer. Fiber is lighly lifted to see the bracing 3" x 1".
HP

PS: the woofer with the green cabling is below the L-pad baffle, so Giskard you can take a look to the crossover schematic that this is the " to 800Hz-woofer, or the to 100 Hz woofer"

[Alex Lancaster]

Could someone pls explain why the speaker "sees" a bigger volume with more ´glass?; Better minds than mine tell me so, I believe it, but cannot understand; ´Glass not being very elastic, more hysteric. (sounds like a religious problem) .

[boputnam]

It's not the glass, per se, but the air that is trapped within, and how it is trapped, by the fiberglass...

[Ralf]

Originally posted by Alex Lancaster
Could someone pls explain why the speaker "sees" a bigger volume with more ´glass?; Better minds than mine tell me so, I believe it, but cannot understand; ´Glass not being very elastic, more hysteric. (sounds like a religious problem) .

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

[4313B]

"Could someone pls explain why the speaker "sees" a bigger volume with more ´glass?"

Besides the classic references this may help as well.
You can get a copy from www.aes.org

[4313B]

"PS: the woofer with the green cabling is below the L-pad baffle, so Giskard you can take a look to the crossover schematic that this is the " to 800Hz-woofer, or the to 100 Hz woofer""

According to the schematic the green & green/black go to the "LF" and the white & white/black go to the "MF".