Frame ideas for drop ceiling

[bwo]

I'm planning on building a drop ceiling placed between speakers and listening position. I'll use 4 panels (120 x 60 x 10 cm) next to each other and make two layers so the total thickness will be 20 cm. Rockwool with 60kg/m3 density.

It would be nice to see how people have built the frame. I need something of course to uphold the panels, and also I'm thinking it would be nice to build it in a way where I can add diffusors on the outside later if ever I want to. It will be used in a living room, so the look counts.

[Glenn Kuras]

How about a normal drop ceiling you see in offices. I am sure you could rig something like that up.

[tINY]

Flying Cloud construction


I flew mine from chains, but you could easily screw them to furring strips or short studs.



-tINY

[DanDan]

Not about the frame, but... 60KG is not optimum for that application.
Your cloud is quite thick.
You could go way way lighter. With a decent airgap there will be better performance with lighter material. See the figures at www.bobgolds.com Absorption coefficients. Note the performance of light materials with the 16 inch airgap.
DD

[bwo]

Originally Posted by DanDan

Not about the frame, but... 60KG is not optimum for that application.
Your cloud is quite thick.
You could go way way lighter. With a decent airgap there will be better performance with lighter material. See the figures at www.bobgolds.com Absorption coefficients. Note the performance of light materials with the 16 inch airgap.
DD

I thought 60kg/m3 was fine for 20 cm thickness and it when you pass 20 cm, lighter material is better? I can't find the figures your're mentioning.

There will be a quite large airgap.

The picture shows how I probably will do the frame, but I will suspend it with wires. There's also a picture of my listening position.

[DanDan]

60KG will work fine. With a frame and that thickness, 40 would probably work a little better and be a bit lighter and cheaper. Check out these materials by feel if you can. Some are a lot more floppy than others. Generally fibreglass is lighter and stiffer.
In general, thicker traps work better with lighter materials. There is no specific threshold, it's a sliding scale. Also note different manufacturers products of the same density vary quite a bit in terms of performance. So any numbers like 10 or 20cm are just suggested guidelines.
http://www.bobgolds.com/AbsorptionCoefficients.htm
DD