Density of rockwall (not fibreglass) for 6" basstrap panel suggestions

[thowell]

Hi,

i have searched both here and other forums for a answer on the suggested density for 6" rockwool (not fibreglass, it's hard to get in Aus) basstrap panels (not triangle chunks) for placing against the corners. But haven't got a clear picture as there are a few conflicting suggestions (probably due to the difference in materials used) I have the mid-high sorted with other panels on the sides/top etc.

So... for 6" panels what would you suggest? 60 kg/m3 rockwall or closer to 30 kg/m3

thanks in advance and i'm sorry if all ready answered by you, just need some clarification.

[Glenn Kuras]

I myself like 8 pound but you can go as low as 4. Which ever you can find will work well for you.

Glenn

[avare]

For 6" thick use ~42 kg/m3 or lighter. It is not critical. Even 48 or 64 kg/m3 will work well.

Andre

[Glenn Kuras]

Originally Posted by avare

For 6" thick use ~42 kg/m3 or lighter. It is not critical. Even 48 or 64 kg/m3 will work well.

Andre

Andre!!!!!!!!!!!!!!!!!!!!! Your back!!!!!!!!!!!! People have been wondering about you.

Glenn

[avare]

Originally Posted by Glenn Kuras

Andre!!!!!!!!!!!!!!!!!!!!! Your back!!!!!!!!!!!! People have been wondering about you.

Glenn

Thanks. It is good to be back. People have wondering about me for years.

Andre

[RonT]

WTF Man!!!! Where the hell u been?!?!?!?!!?!??!?! Glad to c u back bro!

[makasi]

One simple answer if possible, could be extremmely useful (if its that simple to answer lol).

In terms of how lowest the frequencies i want to absorb are. Should I choose a different density for 6" panels?

Lets say I want to kill < 120 hz . What would be the ideal kg/m2 density for the lowest freqs? Using the straddling corner panels? My room is not that big (average bedroom 3.5 x 3 meters) and I do heavy bass dance music with my adam a7x. Lots of info on the low end especially around 50 60 70.

Even if not 6" panels are advised, for sofit style or corner traps, what density would be recomendable for these frequencies?

many thanks

[kasmira]

Hey Makasi,

Less dense material is usually better at absorbing low frequencies. If its possible, soffits or superchunks in the corners would be ideal for your situation - and if you want to do other bass trapping, make the panels as thick as you can. I am in your same situation, small bedroom, dance music, etc and luckily for you I've done a lot of research into what would be best in that environment.

The best suggested material to use for low end absorption is actually uncompressed R30 insulation. This is your typical pink/yellow fluffy insulation used in attics, houses, etc. You can get it in packages of 2x4' ~(60cm x 120cm) sheets, 9.5" (what is that like 22cm or so?) thick. They usually come with 10 sheets per package. If you can build superchunks in the corners first, that'd be great. If not, you could build soffit traps and those would work for the corners as well. If you didn't want to build either, you could settle with making normal bass traps and just mounting them to the corner.

You can also use mineral wool instead of pink fluffy R30. It will still work great, but might cost a bit more. The benefit to mineral wool is its usually regarded as a bit healthier of material than fiberglass, plus, pink fluffy insulation has very loose fibers. Mineral wool is much sturdier. Usually you can find mineral wool in all sorts of thicknesses, from 1" to 4". Again, the thicker the panel, the better. If you can make 6" thick or even 8" thick panels, I would go for it. Try and find it at 2.5lbs/f3 (not sure what this translates to, about 30kg/m3?) - 48kg/m3 or even 60kg/m3 will work if you can't find it lower.

I'm still in the (slow) process of building up my panels for my room. So far, I've got two 6" deep bass traps that are filled with 2.5lbs/f3 mineral wool. I just built four 4" deep frames and will be getting more 2.5lb/f3 mineral wool this week to finish them. I plan on also making superchunks or soffits in the next few weeks using uncompressed R30 pink fluffy insulation.

I think I'm going to lay it out to have the 2 soffits or superchunks in the front corners, my two 6" deep bass traps in front of me, and two 4" panels on both sides of me on the wall. Can't wait till they're finished! I won't have any wall-to-ceiling corners soffits, so I know my room still will have modal issues, but hopefully what I build will help quite a bit. Can't put any holes in the ceiling just yet..

Good luck on your panels!

Sent from my Nexus S 4G using Gearslutz.com
(Wow I'm never typing a post this long from my phone ever again)

[avare]

Great post Alexander!

One correction though.

You can also use mineral wool instead of R30.

Mineral wool can and is used to make R30. It is not an either/or situation.

Andre

[kasmira]

Originally Posted by avare

Great post Alexander!

One correction though.



Mineral wool can and is used to make R30. It is not an either/or situation.

Andre

Thanks for the correction, I sometimes forget that R-values are not only subject to fiberglass, but to any insulation

[makasi]

Thank you thank you thank u!

Very helpful stuff I've been diggin and carving a lot and a lot of info... And you were really helpfull. I might go with 8" panel in the door wall corner, and 6" for the rest of the room.

Im just wondering what would be the ideal mass for the kg/m2 in europe.

You say 30 would be fine? Some people recomend the heavier stuff.. But im almost surelly going for 6" 8" traps and try to cover most of the corners and the rear wall.

Do you think it would be an advantage to cover the panels with Piramidal foam of 1" 40kg/m3 ? As for highs absorption too?

cheers

So basically I just need to convert what you recommend which is around 2.5 pounds it gives me 40kg.

Is this the right conversion formula? Kilograms/Cubic Meter to Pounds/Cubic Foot Conversion Calculator

thanks again

[DanDan]

Roughly speaking 703 is 3pcf =48KG/M^3
705 is double that. It can be hard to find exactly the fibre you want, nearby and affordable.
Isover High Performance Duct Cladding can be found at HVAC/Industrial places.
Knauf Ecose Universal slab can be found at builders providers.
If you go as thick as 6-8 inches why not consider SuperChunks?
The bigger ones are superb performers and can be done very cheaply using the light fluffy attic insulation.
Foam will work fine as a front but would be quite expensive and will deteriorate.

DD

[Glenn Kuras]

Originally Posted by kasmira

Hey Makasi,

Less dense material is usually better at absorbing low frequencies. If its possible, soffits or superchunks in the corners would be ideal for your situation - and if you want to do other bass trapping, make the panels as thick as you can. I am in your same situation, small bedroom, dance music, etc and luckily for you I've done a lot of research into what would be best in that environment.

The best suggested material to use for low end absorption is actually uncompressed R30 insulation. This is your typical pink/yellow fluffy insulation used in attics, houses, etc. You can get it in packages of 2x4' ~(60cm x 120cm) sheets, 9.5" (what is that like 22cm or so?) thick. They usually come with 10 sheets per package. If you can build superchunks in the corners first, that'd be great. If not, you could build soffit traps and those would work for the corners as well. If you didn't want to build either, you could settle with making normal bass traps and just mounting them to the corner.

You can also use mineral wool instead of pink fluffy R30. It will still work great, but might cost a bit more. The benefit to mineral wool is its usually regarded as a bit healthier of material than fiberglass, plus, pink fluffy insulation has very loose fibers. Mineral wool is much sturdier. Usually you can find mineral wool in all sorts of thicknesses, from 1" to 4". Again, the thicker the panel, the better. If you can make 6" thick or even 8" thick panels, I would go for it. Try and find it at 2.5lbs/f3 (not sure what this translates to, about 30kg/m3?) - 48kg/m3 or even 60kg/m3 will work if you can't find it lower.

I'm still in the (slow) process of building up my panels for my room. So far, I've got two 6" deep bass traps that are filled with 2.5lbs/f3 mineral wool. I just built four 4" deep frames and will be getting more 2.5lb/f3 mineral wool this week to finish them. I plan on also making superchunks or soffits in the next few weeks using uncompressed R30 pink fluffy insulation.

I think I'm going to lay it out to have the 2 soffits or superchunks in the front corners, my two 6" deep bass traps in front of me, and two 4" panels on both sides of me on the wall. Can't wait till they're finished! I won't have any wall-to-ceiling corners soffits, so I know my room still will have modal issues, but hopefully what I build will help quite a bit. Can't put any holes in the ceiling just yet..

Good luck on your panels!

Sent from my Nexus S 4G using Gearslutz.com
(Wow I'm never typing a post this long from my phone ever again)

I agree with all of that but for panels 6" or less I would use a higher density if budget is there for it. Once you get above that (soffit design, filling the corner) then start to decrease. If you're looking to deal with VERY LOW frequencies (below 60 hz or so and or keep the life above 300 hz or so) then look at something tuned. I just got back some very interesting lab data on that.

[kasmira]

Originally Posted by Glenn Kuras

I just got back some very interesting lab data on that.

Awesome!

A: You just got very interesting data on what - the type of insulation that works best for a 6" panel, or on tuned resonators?

B: Any chance you will be posting these test results or will they be proprietary GIK test results? We like to hear very interesting things too! :D

[makasi]

Originally Posted by Glenn Kuras

If you're looking to deal with VERY LOW frequencies (below 60 hz or so and or keep the life above 300 hz or so) then look at something tuned. I just got back some very interesting lab data on that.

What do you mean something tuned? :p

(newby) lol