Hardboard Diffusion Material

[tjcinnamon]

I've got a bunch of absorbers that I'd like to make more diffuse. I was thinking about copying the GIK Alpha panels and adding hardboard in front of some insulation behind some fabric. Does the thickness of the hardboard matter? I could double up on the hardboard if it would let less through.

https://www.gikacoustics.com/wp-content/uploads/2015/10/Alpha-Panels-Family-all-colors-no-bg-800x800-510x510_audited-2.png

 

[NBPK402]

I cannot answer your question as to how thick the diffuser part should be, but I made mine out of 1/4" MDF and then painted them with automotive paint. I then spaced them out 1" with mirror spacers from my 5 1/2" thick absorber panels (which have 4" of Roxul r60 inside) my panels are also free standing and stand anywhere fom a few inches to 2' away from the walls...due to speaker placements.

 

[ddude003]

1/8 to 1/4 inch plywood or pegboard... You might look for a copy of the Master Handbook of Acoustics by F. Alton Everest and Ken C. Pohlmann they have an entire chapter on making various absorbers and details of various designs...

 

[tjcinnamon]

I cannot answer your question as to how thick the diffuser part should be, but I made mine out of 1/4" MDF and then painted them with automotive paint. I then spaced them out 1" with mirror spacers from my 5 1/2" thick absorber panels (which have 4" of Roxul r60 inside) my panels are also free standing and stand anywhere fom a few inches to 2' away from the walls...due to speaker placements.

I respect your dedication to the sound. Some wouldn’t be willing to stand things up mid room.

I created a false wall to add some horizontal symmetry.

 

[VinceHoffman]

If you reach out to Lukasz at Seven Audio in Poland, he can make you properly calculated BAD (Binary Amplitude Diffuser) "scatter plates" from 1/8" birch or maple plywood to mount over the absorbent faces of any broadband absorber panel. Lukasz will custom cut the exterior dimensions of your scatter plates to perfectly fit whichever broadband panels you have and even with the overseas shipping the cost is surprisingly reasonable. My landed cost for eight 49" x 25" unfinished maple ply plates worked out to about $50 Canadian per plate.

I finish sanded the scatter plates, stained them grey to match my existing room decor and treatments, and applied a spray-on satin sealer before nailing them to the router-beveled 3/4" plywood frames of my DIY broadband panels.

And the completed panels in use. Lukasz also made the 1D Fractal QRD diffusers seen in a 5 panel array on my rear wall along with the three 2D QRD diffusers seen on my ceiling.

 

[tjcinnamon]

If you reach out to Lukasz at Seven Audio in Poland, he can make you properly calculated BAD (Binary Amplitude Diffuser) "scatter plates" from 1/8" birch or maple plywood to mount over the absorbent faces of any broadband absorber panel. Lukasz will custom cut the exterior dimensions of your scatter plates to perfectly fit whichever broadband panels you have and even with the overseas shipping the cost is surprisingly reasonable. My landed cost for eight 49" x 25" unfinished maple ply plates worked out to about $50 Canadian per plate.
View attachment 63110


I finish sanded the scatter plates, stained them grey to match my existing room decor and treatments, and applied a spray-on satin sealer before nailing them to the router-beveled 3/4" plywood frames of my DIY broadband panels.
View attachment 63111


And the completed panels in use. Lukasz also made the 1D Fractal QRD diffusers seen in a 5 panel array on my rear wall along with the three 2D QRD diffusers seen on my ceiling.
View attachment 63112

Wow! Those are amazing. I just got some plates on Etsy to try out. It was about $30 (USD) per plate with tax and shipping .

If these work out, I’ll get something nicer from this guy.

 

[NBPK402]

This is a pair of mine...

 

[NBPK402]

I respect your dedication to the sound. Some wouldn’t be willing to stand things up mid room.

I created a false wall to add some horizontal symmetry.

I had read that by having the panels away from the wall is like having thicker panels. Now my room is a open Floorplan that is 40' long x 19' and includes the kitchen, dining room, and living room. We about 15' of the room for the living room. Our cei.ing over the living room is around 30'...so I do not have anywhere enough room treatment, but I am not going to spend the money or the work to get treatments up that high. My last room we converted a large 2 car garage into a HT room, by building a room within a room. All the walls and ceiling were fabric covered and at the first reflection points on the walls and ceilings had acoustic panels the same color as the fake panels covering the rest of the walls and ceiling.

 

[tjcinnamon]

I had read that by having the panels away from the wall is like having thicker panels. Now my room is an open Floorplan that is 40' long x 19' and includes the kitchen, dining room, and living room. We about 15' of the room for the living room. Our cei.ing over the living room is around 30'...so I do not have anywhere enough room treatment, but I am not going to spend the money or the work to get treatments up that high. My last room we converted a large 2 car garage intona HT room, by building a room within a room. All the walls and ceiling were fabric covered and at the first reflection points on the walls and ceilings had acoustic panels the same color as the fake panels covering the rest of the walls and ceiling.

How did you support the ceiling in the room within a room?

 

[NBPK402]

How did you support the ceiling in the room within a room?

It has been a while... I believe the ceiling was supported with metal rails and clips. On the side walls we stripped all the drywall and built an additional wall, used metal rails and clips which then held on layer of OSB and thea layer of green glue and then a layer of staggered drywall. I contacted a place that sold all the supplies and would make the plans and give instruction on how to do it.

 

[tjcinnamon]

If you reach out to Lukasz at Seven Audio in Poland, he can make you properly calculated BAD (Binary Amplitude Diffuser) "scatter plates" from 1/8" birch or maple plywood to mount over the absorbent faces of any broadband absorber panel. Lukasz will custom cut the exterior dimensions of your scatter plates to perfectly fit whichever broadband panels you have and even with the overseas shipping the cost is surprisingly reasonable. My landed cost for eight 49" x 25" unfinished maple ply plates worked out to about $50 Canadian per plate.
View attachment 63110


I finish sanded the scatter plates, stained them grey to match my existing room decor and treatments, and applied a spray-on satin sealer before nailing them to the router-beveled 3/4" plywood frames of my DIY broadband panels.
View attachment 63111


And the completed panels in use. Lukasz also made the 1D Fractal QRD diffusers seen in a 5 panel array on my rear wall along with the three 2D QRD diffusers seen on my ceiling.
View attachment 63112

For the ones on the ceiling, how deep are those?

 

[VinceHoffman]

For the ones on the ceiling, how deep are those?

The trio of Seven Audio black stained custom 2D QRDs in my rear ceiling treatment array have about a 5" maximum well depth and are 30" square.