Do Bass traps work with out The wood Shell?

[MakoBlink]

If i were to put up bass traps (705) wrapped up in fabric across each corner of the wall without a wooden shell would it still funciton properly? I could Nail just the 705 , would it help with the room acoustics?

[Ethan Winer]

Mako,

> I could nail just the 705 , would it help with the room acoustics? <

Yes. That's not the same as a membrane trap, but it certainly works.

--Ethan

[z60611]

With an airtight flexable wood cover it's a membrane trap, probably tuned to some low frequency. It would tend to reflect mid and high frequencies.

With a perferated or slotted wood cover it's a helmholtz absorber, probably tuned to a slightly higher low frequency. It would tend to reflect mid and high frequencies.

With a fabric cover it's a broadband absorber, certainly absorbing mid frequencies, and probably high frequencies depending on the fabric, and possibly, depending on it's thickness and the distance from the wall, absorbing some low frequencies. For example, 4" of 703 mounted across a corner should do very well down to 63hz, and have somewhat less absorption below that.

[MakoBlink]

ethan, do you recommend making a wood frame and using plywood instead? On your better bass trap article i have a question that im really confused about. Why do you cover the fiberglass with fabric if you are going to put plywood over it? Am i not understanding these plans?

[Ethan Winer]

Mako,

> do you recommend making a wood frame and using plywood instead? <

Maybe. How big is your room? Unles it's pretty large, I suggest you stick with fiberglass-only absorbers.

> Why do you cover the fiberglass with fabric if you are going to put plywood over it? <

Right, you're not understanding the plans. The fiberglass inside a wood panel trap is not covered. Only exposed fiberglass needs to be covered.

--Ethan

[Sanity Inn]

Hi Ethan

If one were to only use the (705) as corner baffles, wrapped in fabric,,,

would we bevel the corners at 45 degrees to snug into a corner? or just sit one in there square ?


would placing a few 1 x 1 foot wood panels on the front be recommended to reflect back some mid/hi's

also , the door to this rectangled room is also at a 45 degree angle in the room and would be about same size as a corner baffle,, can I glue rigid to the outside of this door and use it as a baffle ? think ridgid fiber would hold door hinges? lolol

if i have to pick up a cheap door and cut slots in it i will


I also posted a topic asking if laying down styrofoam under a commercial carpet , then using 3/4" toungue/ groove 4x8 shhets of ply would work as a temporary basement floor set up..
reason for styro? cold winters

thanks

Sanity Inn

[Ethan Winer]

SI,

> would we bevel the corners at 45 degrees to snug into a corner? or just sit one in there square ? <

Your choice. The only affect would be appearance, not performance.

> would placing a few 1 x 1 foot wood panels on the front be recommended to reflect back some mid/hi's <

If your front wall is standard sheet rock I don't see how adding wood will make much of a difference.

> can I glue rigid to <

I'm not sure glue is going to be secure enough. I usually use long screws with large diameter washers.

I'll let others answer your question about floor construction.

--Ethan