Graduated densities are effective because of their impedance changes. I would go more extreme in material variations. Even having one “layer” of air works well.
Bass traps and diffusers
- Thread starter Spencerleehorton
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Help Support GroupDIY Audio Forum:
Yes- you are taking advantage of space loading and raising the Sbir freq high enough to be mitigated by the wall treatment.
In mix rooms, diffusion can creat problems if it’s too close to the mix position. 10’ is a safe distance for rear or side walls. Space couplers overhead work well with absorbers behind them.
Be sure to check the “random incidence” box. That is more realistic. Also there is a huge margin of error in these numbers, so I treat anything lower than 0.5 as minimally effective.
That is true in practice. Use the ETC and decay time measurements to verify your results
I’ll dig up some photos
In a mix room First reflections and symmetry will guide you. In a recording space you are free to do anything that gives you good sounding options. Corner traps should at least cover one tri-corner and floor-to-ceiling is even better. Don’t forget corner traps can also go across wall-ceiling corner and you won’t lose floor space.
Spencerleehorton
Well-known member
Something I’m thinking about is to put the monitors as far back as possible and have the panels in line with them so to have them flush, what’s your thoughts about this?
This would involve having the panels away from the front wall more.
This would involve having the panels away from the front wall more.
Brian Roth
Well-known member
It's been several years....but I recall trying to find OC 70x sheets in stock anywhere was like finding hen's teeth, unlike it used to be in earlier years (pre-Covid? Supply chain BS?). I need to look again!
Bri
Spencerleehorton
Well-known member
I will need a fair bit of guidance I think here as there is so much information to look at and need to put together a solid plan of attack
Spencerleehorton
Well-known member
Just thought it might be useful to describe how the studio was built.
It has one layer of brick then a 2” air gap then another layer of brick, then a 4” stud wall filled with rockwool then 3 layers of plasterboard.
The ceiling has 3 layers of plasterboard and sand within the gaps.
The main room is divided two thirds down and The divider in the room is a 4” stud wall with 2 layers of plasterboard and some plywood over it, filled with rockwool.
Unfortunately I don’t know what density the rockwool is within the stud walls.
It has one layer of brick then a 2” air gap then another layer of brick, then a 4” stud wall filled with rockwool then 3 layers of plasterboard.
The ceiling has 3 layers of plasterboard and sand within the gaps.
The main room is divided two thirds down and The divider in the room is a 4” stud wall with 2 layers of plasterboard and some plywood over it, filled with rockwool.
Unfortunately I don’t know what density the rockwool is within the stud walls.
It’s easier to find now. As Oz said the acoustical supply houses are overpriced (as is Amazon) but you can special order through Home Depot or Lowe’s. I get that from a commercial HVAC supplier near Los Angeles. Roxul Safe N Sound is avail everywhere, but usually in 16” widths, rather than 24”. Other Roxul (the stiffer/denser ones that Oz mentioned) can be ordered and work well. BTW, the porous absorber calculator website (linked earlier) defaults to 10,000 rays, which is the approx density of Safe n Sound. OC 703 is more like 25,000 rays.
Spencerleehorton
Well-known member
here are a couple of ideas for the mixing room panel arrangement
which do we think would work better?
or is there a suggestion which could be better?
A few inches of airspace behind the panels is a good thing and the speakers can fit in a "hole" in the panels if you like. If the panels start to get close to or flush with the front baffle of the speakers, you may notice a change in the "personality" of the speakers. This is not a good or bad thing, but you may prefer it one way or another. This is not equivalent to soffit mounting the speakers but will change the edge diffraction of the monitors.
There is a good thread about space couplers (belive it or not!) on Gearspace https://gearspace.com/board/bass-tr...ness-traps-4.html?highlight=pvc+space+coupler
Here is a photo of space couplers (not my image, but from the thread mentioned above) made from square pvc drainpipe. Again, the dimensions don't matter too much and placing a coupler in front of an absorber increases the efficiency of the absorber by quite a bit in real measurements.
This confuses me so much. It reminds me of the time I asked an ex to measure something.
She confidently told me "it is exactly 4ft 39cm long"
Are you asking about acoustic treatment or soundproofing? The rock wool in the walls is of no consequence as to how your room sounds.
Spencerleehorton
Well-known member
Yes I know that I just wanted to give the full picture, the studio is fairly soundproof and we have good neighbours
scott2000
Well-known member
Came across this while looking...
Getting a big sound from a small room
You can get a big sound from a small room by employing SpaceCoupler panels to achieve loosely coupled spaces, according to Auralex
Acoustics chief acoustical engineer JEFF D SZYMANSKI. He takes us through the principles and applications of this interesting new product.
https://web.archive.org/web/2012042...onmag.com/pdfs/SWEETS~1/bigsoundsmallroom.pdf
Spencerleehorton
Well-known member
Hopefully we could get back to the original part of this thread please, we seem to be going off pist!!
Need to come up with the best arrangement for my panels
Need to come up with the best arrangement for my panels
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