Rerurn to Romy the Cat's Site
In the Forum: Horn-Loaded Speakers
In the Thread: Jessie Dazzle Project
Post Subject: Sand manPosted by Paul S on: 7/18/2008
Jessie, I love the way you have got it so you can EASILY move anything in any direction. I imagine this will be a key in maintaining your sanity as you and your system evolve together. And I agree with the form-follows function aesthetic, too.
I can say from experience that felt is a poor seal above 1 atmosphere. Maybe you could saturate it with something that would remain +/- flexible?
The nice thing about using foam to shape the rear chamber is that you can drop in a greased negative form and just shoot the foam in. I bought a Hilti foam gun ,and a can of their foam lasts a LONG time. The excellent seal on the gun keeps the thing from getting hard while stored, so it's easy to just pick it up and use it whenever you want, and the gun makes it all very easy to control, believe it or not.
With respect to the ideas for a BIG horn, I wonder about dropping mass just where it's most useful. Perhaps there is a way to make the thing in sections that can bolt together and then pour tar (or maybe even foam) something) between the sections when it's in situ? Or, if the mating surafces can be controlled, maybe a couple of rows of 1/2 round rubber-ish gasket could be embedded in one edge to compress when the sections were bolted together?
Yes, seems fairly dead at higher frequencies, but not so fiberglass, as I found out when I made a tone arm from a fiberglass sail batten. Of course, there is also the fill-with-sand option... I can vouch for sand... Now, that stuff is DEAD!
Best regards,
Paul SRerurn to Romy the Cat's Site