Tim's Corner Slat 2 Helmholtz resonator

[audiothings]

Thank you. Very nice!

[OpusOfTrolls]

You use wood to seal the sides, but it would be interesting to put absorbent there, or leave it open.

[avare]

Thank you Tim!

Andre

[Tim Farrant]

Originally Posted by OpusOfTrolls

You use wood to seal the sides, but it would be interesting to put absorbent there, or leave it open.

If you are referring to the 18x135 vertical panels, they are needed to attach the 10mm vanes and 18mm blocks so they have to be there.

[drakem]

Thank you Tim. I'm in a studio construction process and this comes at the right time!!

[Alejandro Varela]

Originally Posted by Tim Farrant

Here is a design for a low frequency slat Helmholtz resonator designed to mount into the corners of a room. As drawn, it should absorb low frequencies from about 100Hz upwards, although this is only calculated. It also has a diffusive surface as a bonus. The timber sizes are based on a range of profiles available here in New Zealand, so some modification might be required to suit what is available to you. The Autex AAB material is 50mm thick polyestor blanket. The finish is up to you, you can leave it timber or paint it in which case the vanes will need to be painted before assembly. Alternatively you can assemble it and then dip the whole front face.

Enjoy!

Great Tim!
Don't you have a url to see Autex specification.?
Maybe another similar component can be used...
And, can be smaller than 1800 mm tall?

[Tim Farrant]

The dampening material is not critical, but needs to be reasonably dense, ie, dacron type material is too light. Building insulation is fine. If you cannot find black you can hang a peice of black material inside behind the slats to hide insulation colour. Height is not critical at all but the bigger it is the more effective it will be in the room.

[Alejandro Varela]

Originally Posted by Tim Farrant

...If you cannot find black you can hang a peice of black material inside behind the slats to hide insulation colour...

Colour isn't my nightmare. I'm just looking for an alternative material, since Autex seems to be unavailable in my country (as it seems at my first sight)

[Tim Farrant]

Autex is a brand, AAB 35-50 is a 50mm thick polyestor blanket. You could use fibre glass blanket, it's not critical, just need to dampen the interior

[Alejandro Varela]

Originally Posted by Tim Farrant

Autex is a brand, AAB 35-50 is a 50mm thick polyestor blanket. You could use fibre glass blanket, it's not critical, just need to dampen the interior

Thank you. Here in my country I think it's called "Guata", It's used to make anorak, pillows & cushions, isn't it?

[Alejandro Varela]

Could it be build with Rockwool instead of dacron?

[Tim Farrant]

Dacron for pillows is too light. Yes, you can use fibre glass but because the unit has openings the fibre glass particles will be exposed to the room, if this does bother you then fine.

Tim

[Demsy]

Hi Tim,
Should this also work if used not in the corner, but built square for in the middle of the wall behind the loudspeakers? I am thinking of building it for my music room, from floor to ceiling, width is about 60cm, height about 2,25m.
Thanks

[Tim Farrant]

Originally Posted by Demsy

Hi Tim,
Should this also work if used not in the corner, but built square for in the middle of the wall behind the loudspeakers? I am thinking of building it for my music room, from floor to ceiling, width is about 60cm, height about 2,25m.
Thanks

The idea with this unit is to "kill" the corner, ie, make it so acoustically the corner does not exist. I do not think it will be effective as a bass absorber in the middle of a wall and it will need to be made quite deep, 400mm at least. If you just wish it to absorb mid freq and act as a bit of a diffusor, make it about 200mm deep

[Sebastian Vera]

Hi tim! thanks for sharing this traps!

I have a question, can you still make them with thiner wood for body? In the plans says 18mm, what would be a resonable lower limit? 15mm wolud be ok?

[TroyT]

In your opinion, would these corner traps work better, worse, or as well as super-chunks?

[v.dragos]

Originally Posted by TroyT

In your opinion, would these corner traps work better, worse, or as well as super-chunks?

and what happens if you put one of these over a superchunk ? Will it improve or damage the overall performance ?