erion
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Post by erion on Feb 28, 2020 22:09:46 GMT
 I build the frames for turning this existing diffuser into a bass trap! Now my questions are: 1) should i fill the wells and add another layer on the frames of 5cm, and cover with fabric? If yes what density? 2) leave the wells empty and add a very dense (very rigid) insulation of 5cm around the frame and 16mm perforated board on top! Thnx in advance |
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Post by rock on Feb 28, 2020 22:32:38 GMT
Can you just remove the diffusers? If you do you'll probably have more depth. Then fill the space. What is the depth? In general, under 6 to 8 inches use rigid above 8 use fluffy.
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erion
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Post by erion on Feb 28, 2020 23:17:01 GMT
Can you just remove the diffusers? If you do you'll probably have more depth. Then fill the space. What is the depth? In general, under 6 to 8 inches use rigid above 8 use fluffy. no i cant remove the diffuser! The wells are 10cm wide with depth spanning from 19cm / 11cm /9cm /3cm, and i added another 5cm frame! |
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Post by rock on Feb 29, 2020 21:47:52 GMT
I'm pretty sure when you cover your diffuser, it won't work as a diffuser any longer. This seems obvious but I just want to be sure you realize that.
So in my opinion, leaving the wells unfilled will achieve nothing except saving the small expense of filling them with material. I use mineral wool because it's readily available and not very expensive. Rigid fiberglass is very good too and it's what RealTraps use.
So since you want to cover over the diffusers with 5cm (2"), if you get enough mineral wool to also fill the wells 10cm wide (4"), you can cut 2 strips per well of various widths. If they won't stay in and slip out, maybe you can stretch a wire and fasten it across the diffusors to keep them in place. Just sharpen your pencil and add up how much you need.
Cheers!
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erion
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Post by erion on Feb 29, 2020 22:33:51 GMT
I'm pretty sure when you cover your diffuser, it won't work as a diffuser any longer. This seems obvious but I just want to be sure you realize that. So in my opinion, leaving the wells unfilled will achieve nothing except saving the small expense of filling them with material. I use mineral wool because it's readily available and not very expensive. Rigid fiberglass is very good too and it's what RealTraps use. So since you want to cover over the diffusers with 5cm (2"), if you get enough mineral wool to also fill the wells 10cm wide (4"), you can cut 2 strips per well of various widths. If they won't stay in and slip out, maybe you can stretch a wire and fasten it across the diffusors to keep them in place. Just sharpen your pencil and add up how much you need. Cheers! thank you! I have available tons of rockwool of 30kg m3 and 75kg m3 ! I was thinking filling the wells with the less dense material and filing the frame with the more dense and cover with a perforated board to bring back some highs! The reason im turning this diffuser into a bass trap is that behind the diffuser is nothing but the existing brickwall wall! So no treatment around that space! And when i stand in the middle of the BW and LP the lows decrease too much ! |
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Post by rock on Feb 29, 2020 23:59:40 GMT
Acoustic treatment like rockwool BEHIND a solid, rigid wall does nothing for an acoustic space so if your diffusers are built solidly, it won't matter if there's insulation behind them. It may however influence sound transmission to the next room but I don't think that's what you're after.
The back wall is not a bad place for a bass trap but it should be much deeper than a couple inches. The corners (wall to wall, wall to ceiling and floor to wall) are the places bass traps tend to work the best.
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erion
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Post by erion on Mar 1, 2020 1:57:33 GMT
Acoustic treatment like rockwool BEHIND a solid, rigid wall does nothing for an acoustic space so if your diffusers are built solidly, it won't matter if there's insulation behind them. It may however influence sound transmission to the next room but I don't think that's what you're after. The back wall is not a bad place for a bass trap but it should be much deeper than a couple inches. The corners (wall to wall, wall to ceiling and floor to wall) are the places bass traps tend to work the best. yes the diffuser seems to be very solid! Build with 10mm mdf ! The corners are already superchunk ! Above and below the diffuser are 3layers of 5cm rockwool low density! So I thought i need more bass traping as my lows were ringing in the waterfall graph ! Is perforated board ok or fabric is better? |
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Post by rock on Mar 1, 2020 3:06:33 GMT
How many corners are super chunk? A rectangular room has 12 corners not 4.
So you have 15cm total of rockwool above and below the diffuser? You might benefit from either more thickness and/or spacing it away from the wall. But more importantly, you need to step back and assess your entire room.
You do probably need more bass traps but we need to know everything you've done already. You have graphs, can you post them and pictures or drawings of the rest of the room?
Right now you're focused on the diffuser but I have a feeling your efforts may be better spent elsewhere.
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erion
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Post by erion on Mar 1, 2020 11:12:46 GMT
How many corners are super chunk? A rectangular room has 12 corners not 4. So you have 15cm total of rockwool above and below the diffuser? You might benefit from either more thickness and/or spacing it away from the wall. But more importantly, you need to step back and assess your entire room. You do probably need more bass traps but we need to know everything you've done already. You have graphs, can you post them and pictures or drawings of the rest of the room? Right now you're focused on the diffuser but I have a feeling your efforts may be better spent elsewhere. the studio is pre build by a gone musician! Im not allowed to move anything or replace! I just have to work around them! The front wall is ok with flush mounted speakers and find the back of the room to be the weak point! I have a null at 136hz and a too much energy at 39hz at my listening position! I can add qrd diffusers later on top side of this! |
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Post by rock on Mar 1, 2020 14:40:04 GMT
OK, so if you refuse to share dimension, pictures, and/or acoustic measurements, there is nothing more I can do for you. Maybe someone else here can.
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erion
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Post by erion on Mar 1, 2020 17:23:44 GMT
OK, so if you refuse to share dimension, pictures, and/or acoustic measurements, there is nothing more I can do for you. Maybe someone else here can. This is me taking the picture from the diffuser Attachments:
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Post by Hexspa on Mar 1, 2020 18:25:43 GMT
A null in the mid-100Hz range is probably the desk or other close surface. Don't worry about 39Hz.
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mej
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Post by mej on Mar 16, 2020 17:14:26 GMT
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