help building frames for panels

[pjoseph]

I plan on ordering some Roxul RHT Industrial 60 Panels and was planning on stopping by home depot to look at my options as far as wood to build the frames.
So yes I know they come in 2”D X 2’W X 4’L sheets I plan on stacking two high to get a total of 4” thick
I remember reading on the ATS acoustics site that the inside of the frame was about 3.5” deep and they mention that you compress the panels down to fit properly.
So should I shoot for 3.5”D X 2’W X 4’L ? I plan on building them open back.
Any tips or suggestions from anyone who has built these would be great thanks.

 

[robc1976]

I plan on ordering some Roxul RHT Industrial 60 Panels and was planning on stopping by home depot to look at my options as far as wood to build the frames.
So yes I know they come in 2”D X 2’W X 4’L sheets I plan on stacking two high to get a total of 4” thick
I remember reading on the ATS acoustics site that the inside of the frame was about 3.5” deep and they mention that you compress the panels down to fit properly.
So should I shoot for 3.5”D X 2’W X 4’L ? I plan on building them open back.
Any tips or suggestions from anyone who has built these would be great thanks.

I hve not buit any but be site you have at least a 2" gap on the back of the panel...VERY important.

Here is a pic of what I am talking about:

 

[lsiberian]

2x4 is very cheap and with a miter saw this should be very easy IMO.

I hve not buit any but be site you have at least a 2" gap on the back of the panel...VERY important.

4" of mineral wool or high density fiber will kill nearly all reflections. Roxul is mineral wool so a gap isn't really necessary. It might make mounting easier though. Wrap with burlap and you should be good. You could also put a poster on the front if you want to do a movie theater like presentation.

Treat behind your head first, then behind the speakers, then corners then side walls(skipping first order reflections)

 

[robc1976]

2x4 is very cheap and with a miter saw this should be very easy IMO.



4" of mineral wool or high density fiber will kill nearly all reflections.

If you want to increase LF absorption, starting with a 2" - 4" air gap behind the panel Everybody has different opinions...but most to manufactures do put a air gap...I had panels with out a gap and noticed a difference with the gap....just my 2 cents. Also depends on what your after to...he may just want HF.

 

[lsiberian]

If you want to increase LF absorption, starting with a 2" - 4" air gap behind the panel Everybody has different opinions...but most to manufactures do put a air gap...I had panels with out a gap and noticed a difference with the gap....just my 2 cents. Also depends on what your after to...he may just want HF.

4" of Roxul 60 on-wall is demonstrated to have nearly 100 percent absorption through through the entire range.

 

[robc1976]

4" of Roxul 60 on-wall is demonstrated to have nearly 100 percent absorption through through the entire range.

OOPS LOL!! I did not see the "Roxul 60"...my fault....I thought he was using 703.....my reading skills have been bad lately LOL!!

 

[Jeff R.]

I am looking at building a similar setup for my room.....Is there any restrictions on the fabric I can use to cover the wool and Frame with? My wife want to go and pick out some agreable colors and or designs, just wondering if I need to exclude specific materials of fabric.

Thanks

 

[pjoseph]

From what I have read the fabric must be breathable, basically means it will allow air to pass through.

there are some companies that can print an image of your choice on the fabric, if you go with the image route the ink must not be one that binds the fabric.

Gikacoustics is the one company that I read about on here that can print the images.

 

[Jeff R.]

OK good to know....Thanks for the input.

 

[lsiberian]

Correction as you can see the frequencies below 125 benefit from an air gap. I retract my previous statement on the matter.

First you should realize that NRC ratings are merely an averaged performance rating based on rates of absorption at specific frequencies. Whilst this number is usually applicable to frequencies higher than the tested mid band frequencies, the same cannot be said for low end frequencies. However, since you are a merely concerned with mid-band and high frequencies absorption the NRC rating is a good metric for you to use in your endeavors.


The difference between a 2” panel and a 4” panel of OC 703 is going to be increased absorption at lower frequencies.


Looking at the blue traces only, which represent flush mounting, you will see the difference between a 2” panel and a 4” panel of 703.

2" OC 703



4" OC703



100% absorption is 100% absorption…you can’t’ absorb more sound than exist, though it is possible to have an NRC greater than 1 (full absorption) due to their methodology…

 

[Jeff R.]

So I am going to build my panels....I will be making 8 panels each... will be 4" thick roxul and 2'x 4'. Should the finished panel be rigidly attached to the walls, or loosely hung like a picture is hung. Thx
any other helpful tips.