I would like to compare a pair of measurements made with and without room treatment in an RT60 graph. I can do it using the Overlay but it is picking T20 and I would like to view it as Topt. I can't find any way to change it or perhaps the Overlay isn't the proper solution for what I'm trying to do? I have both of Dr. Wong's E-Books as well as other guides but can't work out how to do it. I'd appreciate it if someone could point me in the right direction. GIK is working with me on additional room treatments to improve what I have and I'd like to be able to have some idea if improvements have been made
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RT60 Graph Multiple Measurements
- Thread starter Daverich4
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- Thread Starter
- #4
Thanks for your help, that’s exactly what I was looking for.
- Thread Starter
- #5
Once I get the room as best I can with treatment I’m going to add a pair of subwoofers. Hopefully I’m not too old to do the Sub Crawl.
Keith_W
Master Contributor
I wouldn't say it's helping very much. First let's make sure that the measurements are comparable, we'll look at the the overlay between "Right Bare" and "Right Treatment":
Yup, exactly the same pattern of reflections that sit on top of each other exactly. This means the microphone was not moved between "treatment" and "no treatment". We see the same with the left, so we'll move on.
And this is a comparison of right with/without treatment. We can see that it has improved things A LITTLE, by dropping the RT60 about 100ms between 300-600Hz. This is why it is important to check the ETC to make sure the mic was not moved - if his room is small, 300-600Hz is right smack in the middle of the transition zone where you EXPECT measurements to vary by A LOT depending on where the mic was positioned.
Depending on the size of the room and intended application, I would not be happy with this result. Especially with that huge forest of early reflections in the ETC. Some of those may be measurement artefacts (the most common is because someone is using that UMIK-1 mini tripod). Also, don't be too quick to deploy room treatment. Dr. Toole says that the target RT60 can usually be achieved with normal room furnishings. That's what I would go for first, it makes your house more liveable and improves the acoustics at the same time.
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The room is approximately 19'x23' with a small alcove and a set of stairs in the back left corner. The microphone was on a stand with a boom and stayed in the same position for all the measurements. My current room treatment is a pair of GIK Bass Traps in the front corners and a RealTraps panel on each side. Those panels were place with the help of a mirror. I currently working with a service that GIK provides to analyze my room. It is a dedicated room and I'm the only person that uses it so I'd prefer to use room treatment instead of adding furniture and other accessories that would never be utilized. In another post on this forum several people suggested that the solution to the problems I'm having with the bass in the room would be adding 2 or more subwoofers. I'm going to see where room treatment takes me and then will add the subwoofers to help out.
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