And Now For Something REALLY BIG

[JRKO]

egg crates + Altecs = OLD SCHOOL COOL

[Cal Weldon]

This is just a wealth of info here. I've never seen an Altec 1" multi nor an Altec woofer with a return yoke on the Alnico. Mind you I've never seen a 614 cabinet in person either but at least I knew they existed.

[Pano]

Is the Lansing stuff considered real "Altec", or is that line a very muddy one?

[JRKO]

Ok, paper is the way forward. I'll leave off the 8 Cell ePay special because I can have more fun sticking stuff to my fingers and the cat. Also it should come in under budget (I hope)

Looking at this calculator Single Driver Website I need to understand some finer details....

Throat Area (cm2) - is this for a single cell or am I calculating for the entire structure then dividing it up?
Flare Frequency - as above and how does one go about picking the frequency? The ePay specials for example were a 300hz flare and I'm looking at 65hz as the lowest usable freq of my driver
M (The degree of hyperbolic influence) - I assume pure exponential?
Cabinet Width - should I specify the actual cabinet or reduce it to the ideal cell size as I'm making several to for a whole horn?

Thanks for baring with me fellas. They upped my bipolar drugs and I'm felling like a barely functioning idiot

[buzzforb]

This is starting to get interesting.

Perhaps this will help
http://rocketsciencecanada.com/Sound..._SizeShape.asp

[Pano]

If you want to build a 1005, I can measure for you. 803 I could drag down out of the loft.
Can't help with any others.

1005: Each cell mouth is 6.25"x6.25"
Cell length is 15"

Would have to pull them apart to measure the size of each cell at the join. It's less than 1", for sure. You can see the horn profile in the photo below.

[buzzforb]

JRKO,
FOr your inspiration.
Google Image Result for http://www.audioheritage.org/vbulletin/attachment.php%3Fattachmentid%3D25997%26stc%3D1%26 d%3D1182669423

[Pano]

Very cool!

[murphythecat8]

Originally Posted by ScottG

But it IS!

JBL 4355 speakers restored by Kenrick Sound has been delivered to Mr. Abe's room - YouTube

Ok.. not really, but it's not exactly large either.


..I don't know Japanese (at all), but I suspect the movers (just before unwrapping the 1st one) were saying something along the lines of:

"you want us to put this where?"

ohh wow, the guy had to put this song for the demo?

[JRKO]

Originally Posted by buzzforb

JRKO, For your inspiration

Originally Posted by Pano

Very cool!

Those are NICE. What is so depressing about it is those horns are a first effort before the guy makes 1505's!!! Some people are so talented........damn them

Now for some ideas to test:

for initial joining of the sides of the cell together how about maybe 4 or 5 thin tabs as part of cell cutout. These are then glued to the next side etc so you have a fairly dimensionally stable base upon which to lay your mache strips.

Need to figure out if its better to use slightly watered down PVA, wall paper paste (anti fungal goodness), large strips or thin, thick or thin paper thru out or maybe mixed.

another thought would be to lay each layer at 90deg to build up a sound structure.

Also thought of embedding wire between layers every now and then. Or even better take Petter's 'ring clamp' idea and make squares of stiff wire to fit around the outside to keep the the cell strong

It obviously needs to be self supporting and I think will get stronger as more cells are joined together. If memory serves, paper mache ends up with a stiff tap sound moving to dull thud the thicker it gets, but I doubt we need to go much past 2-3mm if 3mm ply or MDF works, paper 'should' be stiffer. How many layers to you guys see as being required?