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Tim's Corner Slat 2 Helmholtz resonator
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Tim Farrant
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11th December 2012
Old 11th December 2012
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Tim's Corner Slat 2 Helmholtz resonator

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!
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11th December 2012
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Thank you. Very nice!
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11th December 2012
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You use wood to seal the sides, but it would be interesting to put absorbent there, or leave it open.
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11th December 2012
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Thank you Tim!

Andre
Tim Farrant
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14th December 2012
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Quote:
Originally Posted by OpusOfTrolls View Post
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.
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14th December 2012
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Thank you Tim. I'm in a studio construction process and this comes at the right time!!
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28th December 2012
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Quote:
Originally Posted by Tim Farrant View Post
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?
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29th December 2012
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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.
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29th December 2012
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Quote:
Originally Posted by Tim Farrant View Post
...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)
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30th December 2012
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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
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30th December 2012
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Quote:
Originally Posted by Tim Farrant View Post
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?
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3rd January 2013
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Could it be build with Rockwool instead of dacron?
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5th February 2013
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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
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28th March 2013
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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
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9th April 2013
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Quote:
Originally Posted by Demsy View Post
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
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13th April 2013
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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?
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5th May 2013
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In your opinion, would these corner traps work better, worse, or as well as super-chunks?
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7th May 2013
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Quote:
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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 ?
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I think these were meant to replace super chunks. From my understanding hemholtz are suppose to be more effecient then insulation super chunks. Correct me If im wrong.

I was wondering if a slat and slot hemoltz would work in corners, Im happpy to see it exist.

Would it be ok to put the fabric in front of the slats instead of behind?
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Quote:
Originally Posted by SatelliteSP View Post
I think these were meant to replace super chunks. From my understanding hemholtz are suppose to be more effecient then insulation super chunks. Correct me If im wrong.

I was wondering if a slat and slot hemoltz would work in corners, Im happpy to see it exist.

Would it be ok to put the fabric in front of the slats instead of behind?

Classic HH are usually tuned to one frequency and do not cover whole range of "bass frequencies", while anything like super chunks do cover wide range of them.
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Quote:
Originally Posted by rwprom View Post
Classic HH are usually tuned to one frequency and do not cover whole range of "bass frequencies", while anything like super chunks do cover wide range of them.
Your right "Classic HH" dont cover a range, but this is not a classic HH. The space in the back is of varying depth so its covers a wider range. From 100hz and up according to TIM
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2 Weeks Ago
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Quote:
Originally Posted by SatelliteSP View Post
Your right "Classic HH" dont cover a range, but this is not a classic HH. The space in the back is of varying depth so its covers a wider range. From 100hz and up according to TIM
Exactly. The calculated frequency range would begin at around 100Hz. I did not suggest this as a replacement for super chunks which would absorb a greater range, it is merely a "nice" acoustic object that I have used in control rooms with good results.

Tim
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