Re-think and re-imagine the 1505 multicellular horn.

Matte black anodize finish. Really hoping damping material will not be needed. Will have to do quite a bit of testing. But, if damping is not needed, then, these horns can be anodized with any colors. That would be something.
 

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Amazing project. Really impressed by the craftsmanship of the aluminium components!

I've done a project of my own based on these blueprints: 500 Hz exponential multicell horn for JBL2445 by pelanj

The cells measure 11cm at the front. So slightly smaller than the 16cm of the 1505.
I'd really like to do two more with bigger cells made of plywood and 3D print the driver adaptor.

Is there anyone here that knows the exact measurements of a 1505 cell? Once I get the right measurement I'll figure out the rest quite easily. :)
 
Have just received the ISO 1510 and 1505 protypes. Fabricator got most everything right. Still a few areas for improvement. Hooked up the ISO 1510 first for listening.

The ISO 1505 is big. A couple of pics next to the dog for scale.

BTW, did a quick knock test on both horns with my 25mm diameter steel ball. No ringing. Sound muted as compared to my cast aluminum horns.

IMG_8665.jpgIMG_8667.jpgIMG_8668.jpgIMG_8670.jpg
 
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maybe your dog doesn't care for the sound?
I believe someone here commissioned a set of built up multicell horns and also found them lacking. They were wood I believe and sure looked the business!
 
maybe your dog doesn't care for the sound?
Nah, he's not happy I interrupted his chewing on a bone (can see in the background).

Wooden multicellular horns should be fine. Easier to set up and use. Metal horns can be a bit bright and require more work to set up. The reward is a bit more air and snap at the top end. The secret sauce is in the transition geometries and distance from the round throat to the cell throats matrix. This is the main reason why I chose not to follow Altec's 1505s dimensions and geometries. By the way, my comment is by no mean a knock on Altec's 1505's. IMHO, they were specifically designed for large venues. They work extremely well for that purpose. My ISO 1505 is designed and optimized for home environment and listening.
 
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I'd love to hear this setup in stereo. In a large-ish room, say 24'x24'? Man...

Trieu, you continue to amaze me.
 
A quick listen to 1505s

Having heard 1505s, I'm finding the latest pages of this thread (he's done it and is listening to them!) very intriguing! I'm just amazed at what you have been accomplishing with your horn builds Tsingtao, and these are a whole new level in an unexpected direction. Just...wow.

I still remember how those 1505 put music right THERE in front of me in a full-scale, full-flavor, full-dynamics way, all along with sweetness and subtlety that did not match the visual. If I ever had the room for these (which I don't and won't) I'd be chasing this unicorn.
 
I've built Peter Persson's wooden 1503s years ago. The horns performed fine. But, not the sounds I was looking for.

Fast forward 10 years... The ISO 1505 horn is surprisingly revealing. Strings being plucked, singer's inhaling before belting out a line.... Even playing in mono, the image is huge due to the physical size of the horn and the 15 cells. My ears could not detect any lobbing. The sound is in your face with just the 1" throat Altec 802D. I really like what I've hear so far. But, need more listening time.

BTW, will be sending both the ISO 1510 and 1505 to the hipster speaker builder for evaluation. If he likes both, there may be sufficient quantities to keep the prices low. (The more you order from the factory, the lower the per unit cost).
 
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BTW, will be sending both the ISO 1510 and 1505 to the hipster speaker builder for evaluation. If he likes both, there may be sufficient quantities to keep the prices low. (The more you order from the factory, the lower the per unit cost).

Are you still considering the 2” throat version?
 
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