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Home Project Studio - Treatment Series: E3 Measuring RT60 and placing absorption
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- Опубликовано: 4 сен 2024
- This episode explores using absorbers, Live end/dead end design, measuring RT60, reading plots, and hearing the results of good absorber placement. I'll leverage powerful REW acoustical measurement tool wto collect data before and after treating the room. Lastly, I'll expose how REW is helping me to make the former bedroom into a great Home Project Studio!
REW - Room EQ Wizard
www.roomeqwiza...
best series for the home studioist doing room treatment. This was so helpful. Thank you
Thanks!
Thank you! Saved my life, keep going! COngratz from Brazil!
Glad it helped!
Great video!! Please continue, you are very clear with these explanations.
Thank you!
Your explanations and videos are far and away the best I've encountered here on RUclips. Many, many thanks. Armed with these videos, I believe I'll be better able to use REW and the newly discovered Amroc to treat my 13x17 listening room. Greta work!
Thamk you Tim! Greatly appreciate the feedback. Looking forward to hearing more about your room and your journey!
You sir are doing the Lord's work!! Great content!
Thank you! Do what you Love-Love what you Do.
This is such a great video :)
I have a question about the average of RT60, How can we find the average of the RT60?
Thank you :))))
Here's a link to some standard reverb time for specific use rooms. To average your room's RT60, Use a tool like REW to sweep your room, then use the RT60 values per 1/3 octave bands to average the time decay.
What I learned is it's best to go after the lowest Axial modes first. Sticking low frequency absorbers in the corners isn't going to treat Axial modes. I think that's where most people make a BIG mistake. Axial modes are the entire surface, that it's best to have at least 50% to 70% surface coverage of absorption that will go after those low frequencies. Most rooms have Axial modes starting in the 30hz to 50hz range, and then for ceiling heights of 7ft to 9ft usually have floor to ceiling problems in the 65hz to 75hz range. Again, about 50% to 70% surface coverage will yield a VERY noticeable improvement.
Also, for going after 30hz to 50hz range, diaphragmatic absorption is typically going to absorb the most vs other absorption devices. The problem is that these types of devices are 12in to 16inch deep and you'll lose a lot of usable floor space. The way around that is to build a room where this type of absorption is built into the wall. But the materials/labor is expensive. But it's possible to create a room using proper materials, design to get a flat response curve no matter where you are in the room. I found a company that does custom design work, but they also have what appears to be the most powerful absorption devices for going after those 30hz to 50hz range. The good thing is that you can add a high quality open cell foam on the front of these devices and have a full range absorption product in one unit. And even better, they offer build plans so you can build your own units. The only problem is they aren't easy to build and you need some experience and tools to make these devices, and also buy certain materials from the company that you can't purchase eslewhere.
The biggest mistakes are that I see a lot of people not really treating the Axial modes as they just stick low frequency absorption in the corners and only mid/high absorption around the room, and they don't have enough surface coverage.
Corners is only going to absorb about 5% of the total room's low frequency issues. Not good advice to only absorb 5% of the problem.
Hi, can I please find out what absorber material you used along with it's density ?
Great videos. I hope you continue with them. I would also love to learn more about how to setup and read the RT60 results. I have been using REW for subwoofer time alignment and subs to mains integration. But the decay, RT60, waterfall graphs confuse me. I do have years of experience reading vibration waveforms and spectral data, so this should not be this confusing to me, but it is.
Thanks Dustin! REW has some amazing online help for getting informed about the various plots and what you can learn from them. Others have asked about a slightly deeper dive into what these plots are saying so stay tuned!
Hello,
Thanks that's clear and precise. However, not sure what you used for front corners ?
Greg
I used a corner trap design from Sound on Sound article. Check it out here... www.soundonsound.com/techniques/studio-sos-making-small-room-sound-good
@@mediaunion thanks for reply,
One thing I don't understand is if there is a rigid panel in the middle or juste some black vynile sheet...
Best regards Greg
@@satriany31 Sorry for the confusion. I included a sheet of 1/8" Mass Loaded Vinyl in each corner trap. I sealed them in 4 mil plastic because I thought they smelled funny and it bugged my nose.
Thank you very much, it is agreat explaination, when i use rew for first masurement, it need calibration sound card and spl level, do this calibration important or can i skip it, becuase i havent spl meter yet
Do you have a smartphone? there are inexpensive apps available that are SPL meters...
A SPL meter is really important for other tasks including setting levels for each of your monitors.
Another great one!!
Thanks again!
How does REW create the graphic at 4:09 and or how do you get it to portray data based your octave bands? Thx.
Glad you're digging in. I'm in the REW overlay mode which displays all your active sweeps. To change to Octave or 1/3 octave bands, go to the "Gear" in the upper Right corner of the REW overlay window. Click on it and a menu will drop with different preferences for RT60. If you change the plot/graph type, the preference menu will have settings specific to the type of graph. If you leave the Overlay mode, the Gear for the individual sweep display functions the very same way. For RT60, I checked "Use bars on plot" box. Then chose 1/3rd Octave. Thanks!
What panels and traps did you use? DIY?
I have 2 GIK 2x4x4" Bass Traps, 4 DIY 2x4x2" Cloud Absorbers, 6 DIY 2x4x4" Bass Traps, 2 Hofa 44"x22" Tube Bass Traps. Upcoming video will show how I used these...
@@mediaunion Thanks. Looking forward to your DIY trap video... I know there's a lot of specs/plans online but I'd rather trust somebody who actually made one and tested it than waste my time on random designs. Keep up the excellent work!