Home Project Studio - Treatment Series: E3 Measuring RT60 and placing absorption 

best series for the home studioist doing room treatment. This was so helpful. Thank you

Thank you! Saved my life, keep going! COngratz from Brazil!

You sir are doing the Lord's work!! Great content!

Great video!! Please continue, you are very clear with these explanations.

Your explanations and videos are far and away the best I've encountered here on RU-vid. 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!

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.

Another great one!!

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 :))))

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.

Hello, Thanks that's clear and precise. However, not sure what you used for front corners ? Greg

How does REW create the graphic at 4:09 and or how do you get it to portray data based your octave bands? Thx.

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

What panels and traps did you use? DIY?