[Christof]

Ethan et al.

I'm thinking about building a couple corner traps and would like to ask your opinion (critique).

I would like to take 36" diameter 3/4" plywood circles and quarter them into pie pieces. These would act as the top and bottom of my traps. The back walls will be from 18" x 7' x 1/2" thick plywood and the front will be made from kerf bent plywood. The traps can stand about 7' high.   All vertical walls will have cutouts which eliminate about 75% of the plywood material allowing soundwaves to enter the trap. Traps will be heavily stuffed with fiberglass.

 

Thanks for any input

[Tonto Yoder]

Why not just follow Jon Risch's recipe?? Top and bottom are circles of ply connected by a "tube" of chicken wire, wrapped then with fiberglass insulation, and fiberglass then wrapped with fabric (so that the fiberglass can't escape into the room).

[Ethan Winer]

Chris,

> I would like to take 36" diameter 3/4" plywood circles and quarter them into pie pieces. <

You can do that, but understand that what really matters is getting enough fiberglass in the corner. Everything else is dressing that may or may not help. In the case of adding wood, that always hurts unless you remove most of it. Your 75% figure is okay, but not as good as 100%

I also suggest you consider thinner, lighter material like 1/8 inch Masonite or plywood. Then at least some of the lowest bass can get through whatever material remains.

--Ethan

[Red Dragon Audio]

Here are a couple images I whipped up for another http://www.audiocircle.com/index.php?topic=16394&postdays=0&postorder=asc&start=0">post that might come in handy for your project.  Just find a rigid fiberglass manufacturer that has 36" diameter round pipe insulation with a good 4-6" thickness and density of around 4-6PCF.  Cut each half...well in half again and you've got your quarter round bass traps.  

Hope this helps.

[markC]

Why not just follow Jon Risch's recipe?? Top and bottom are circles of ply connected by a "tube" of chicken wire, wrapped then with fiberglass insulation, and fiberglass then wrapped with fabric (so that the fiberglass can't escape into the room).

That would be hog wire   . Chicken wire is much lighter gauge and too flimsy to hold the fiberglass in place.

[Tonto Yoder]

That would be hog wire   . Chicken wire is much lighter gauge and too flimsy to hold the fiberglass in place.

You're right, you're ABSOLUTELY right!
Here's the link--
http://www.geocities.com/jonrisch/basstrap.htm

[Christof]

Thanks for the links and info.  

My design model on the plywood skeleton bass traps was based on the fact that I need to lift them off the ground about 8" if they are to fit flush in the corners of my Victorian home.  My Base trim is huge and sticks out from the wall about 1.25"  

c.

[Red Dragon Audio]

Thanks for the links and info.  

My design model on the plywood skeleton bass traps was based on the fact that I need to lift them off the ground about 8" if they are to fit flush in the corners of my Victorian home.  My Base trim is huge and sticks out from the wall about 1.25"  

c.

The rigid fiberglass pipe insulators I suggested would work perfectly for your application.  They are stiff enough that they will retain their shape even when suspended.  They'll probably work better than the Jon Risch hog wire traps and certainly have cleaner looks.

I'll let you figure out how to fasten them to the walls and what kind of fabric to cover them with.