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Which to choose Pyramid Foam, Flat Foam or Build RockWool Panels??
Old 4th January 2013
Gear Head

Thread Starter
Unhappy Which to choose Pyramid Foam, Flat Foam or Build RockWool Panels??


I just mooved to a new place and i changed my old room with a pretty big room (4x4.06m height 2.93). I applied my old acoustic treatment but due to the room being bigger it doesn't eliminates all the echo from it.

Next week I want to buy some acoustic treatments and I need some help guys choosing the right one. I live in Italy, here there are some resellers and some small factory where they make acoustic stuff.

I found these Absortion Panels Flat 100x50x5cm 30kg density 9 euros
Then there is this one Pyramid Absortion Panel 120x60x5cm 30kg density 10 euros
eBay Italia - Aste online e shopping a prezzo fisso

And Panel in rock wool 50 mm, density 60 kg / m² 8.64 Mc 60x120 cm EUR 49,50 + other material to build the panels

Pannello in lana di roccia 50 mm,densità 60 kg/Mc mq 8,64 | eBay

Which one is better? I want to reduce the echo in the room so I can be able to hear and mix better and generally improve the sound so I can hear what I'm actually doing during my music. I already have 2 bass traps, 2 50x50 panels one on my right wall the other one left and two same panels behind each monitor speaker. I was thinking to put some 3 panels on the left, 3 on the right 2 in front of me and one big panel on the ceiling. Need some help guys, i don't have that much experience in this kinda of stuff and I don't want to buy some crappy stuff . Thank you
Old 5th January 2013
Gear Guru
DanDan's Avatar
Best Traps

RockWool or FibreGlass or Poly insulation no doubt. In Europe Caruso Isobond seems very nice. Most of us here recommend 100mm with a 100mm airgap behind of possible. You can stick two 50mm together. Here's a great Trap design.

Old 5th January 2013

The foam doesn't work well on lower frequencies. If any of your trouble is below about 1kHz, I'd go with the Rockwool..


Old 5th January 2013
Gear Head

Thread Starter
So by applying in the right way the panels (let's say I build 6-7 Rockwool Panels, I would make them free-standing for better use) 100mm and with the air gap of 100mm, I should be able to eliminate the annoying echo that I hear in the room?

The acoustic foam I found and indicated in the post won't get me these results?

I'm not looking for perfection with acoustics since the room it's not even build for acoustics but I want to stop having frequencies bouncing around the room and the echo. Do I need more treatment for these result than the one written upper?
Old 5th January 2013
Gear Head

Thread Starter
PS- I wanted to mention that the low freq echo (kicks and some bass) it's not letting me hear my mixes well
Old 5th January 2013
Old 5th January 2013
Gear Head

Thread Starter
Thank you all for the replies. Gearslutz and it's members are always there with the right answer )

Just went today at the local store where I found pretty much all the stuff for
building some rockwool panels. Let's say that I will build them as DanDan said,
it's ok to use 40 kg, density ones or should I order from Internet the 60 kg density ones?

At the store the only have 100kg and 40 kg density, wich one is the optimal for absortion and bass trapping?

And since I read pretty much everywhere that rockwool is far better than fiberglass foam why companies still sell foam, does rockwool tend to have problems like moisture and deformation? Anyone heard differences between these two?
Old 5th January 2013
Gear Guru
DanDan's Avatar

Choosing between 40 and 100 in Rockwool, I would go definitely go for 100 for traps up to say 150mm thick. 40 tends to sag and droop. Straddling corners, including ceiling corners, the 100Kg would have a bit more of what Glenn and I call the 'drum head effect'. For thicker traps or filling corners I would go 40 and below, in frames.

Old 5th January 2013
Gear Head

Thread Starter
So by using the 100 KG/mc It still reflects highs doesn't, it's not reflecting stuff? I'm just getting a little confused with all these kg/mc.
I've read a some threads on this site and saw that some guys go for lower density other for higher like 100. It's true that 60-70 kg it's optimal?
I may put two 100kg in the corners and lower density (60-40) on the early reflection and behind me, maybe some on the ceiling. It's easier for me to just buy all 100kg ones like u all guys said, Thank you
Old 5th January 2013
Gear Guru
DanDan's Avatar

Everests book shows little or no difference in performance of fibre absorption over a 4 to 1 range. Don't worry. 100KG will be absolutely fine. If you are going over six inches or so I would go for something lighter and cheaper. -And better when very thick. has tables of measured absorption coefficients.
Here's an example.

703, plain 4" (102mm) on wall 3.0 pcf (48 kg/m3)
0.84 1.24 1.24 1.08 1.00 0.97 1.15
705, plain 4" (102mm) on wall 6.0 pcf (96 kg/m3)
0.75 1.19 1.17 1.05 0.97 0.98 1.10

As you can see there is little between them as Lab measured.
Rockwool is a lot saggier than fibreglass.

Old 5th January 2013
Gear Head

Thread Starter
Thanks to all for the advices. Dandan, going to get the 100kg ones. Thank you very much
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