Panel question.

[Rocket Ronnie]

Would it be ok to put some auralex foam. The wedge type (2\") on top of some frk type insulation? I already have the foam. I want to make some frames with the foam as the front.

[Glenn Kuras]

Sure you can do that but don't use FRK on the fronts.

[Rocket Ronnie]

Originally Posted by Glenn Kuras

Sure you can do that but don\'t use FRK on the fronts.

Well I have tried it with rockwool. But the foam comes off after a while as the rockwool dosn\'t have a firm enough finish. The idea was that the foil type layer would be a good surface to stick the foam to so it will actually stay. The Auralex stuff works well down to 500Hz. I was thinking that below that would pass through the FRK. Well I was hoping.

[Rocket Ronnie]

What frequency cut off does the FRK facing reflect?

[Rocket Ronnie]

Anyone?

[Glenn Kuras]

I am not sure of the frequency that it would totally pass through at but I guess you would be ok. Really the only way to find out is to try it and see.

[Rocket Ronnie]

I guess you don\'t use the FRK stuff in your products then. I think Ethan does. Maybe he has tested it.

[DanDan]

Hi Ronnie. FRK will reflect higher frequencies. It is a sliding scale, no clear turning point. Also it will resonate a little around 250, probably useful. Overall a complex behaviour, but hey RealTraps work real well.
Under the foam like that, FRK may work as a sort of damped membrane. Untested, but if I had to guess, I would say your design is good.
DD

[Rocket Ronnie]

Thanks DanDan. I guess I could drill some holes in the FRK face to let some more high in. But still leave enough surface to stick the foam on securely.

[DanDan]

You could. Since you are using frames you could put a mesh front on them and glue your foam to that. Use a web glue though, one that sprays out like a spiders web. Otherwise you will have a layer of impenetrable glue in there.
DD