Looking for a little help in reducing peaks and nulls

[Nick Morris]

How far zoomed in should one be to reading into the ETC? In my case, what is the first reflection that it shows? Should I be as concerned about the later arriving spikes that appear? What is the cutoff point since most seem pretty low in magnitude.

[Ethan Winer]

Originally Posted by Nick Morris

How far zoomed in should one be to reading into the ETC?

This is the key, you need to zoom in more to see the "early" reflections. Reflections to be concerned about are those that arrive within 20 milliseconds of the original, and are louder than 15 dB down.

--Ethan

The Acoustic Treatment Experts

[Nick Morris]

Originally Posted by Ethan Winer

This is the key, you need to zoom in more to see the "early" reflections. Reflections to be concerned about are those that arrive within 20 milliseconds of the original, and are louder than 15 dB down.

--Ethan

The Acoustic Treatment Experts

Thanks for the tip. I have zoomed around trying to inspect within the simple guidelines you just gave. I guess I don't know exactly what a reflection actually looks like in the ETC graph. I mean, zoomed out I can clearly see spikes here and there, but zoomed in, it all looks the same to me.

I have attached a zoomed in ETC. Any pointers on maybe a rough estimate on the timeline as to what is exactly looking like a peak from a reflection? Thanks a ton for the help by the way

[Jens Eklund]

In the ETC; you want to see a time period of at least 0 (direct sound) milliseconds to about 50-100 ms (depending on the given situation) and between 30-40 dB range (where the direct sound is at 0 dB, also depending on the situation and design concept chosen). The best option if you want help in forums is to simply post the actual IR file (exported as wav/aiff so that it can be opened in any software by anyone). This way anyone can look at the data anyway they want to.

More here:
Before posting your measurement results

[Nick Morris]

IR file uploaded. Thanks Jens!

[Nick Morris]

Anyone want to take a second to open up the IR and take a peek? Thanks!

[jim1961]

Originally Posted by Nick Morris

IR file uploaded. Thanks Jens!

If you do a screen shot, then all of us can see it.

[Nick Morris]

I think that was the problem before that we are trying to avoid by uploading the IR. I don't know what to make the screenshot of. Where do I zoom in to? I thought my other screenshots were relatively close to what was asked for.

I feel like I'm digging for gold in a gold mine with no idea what gold looks like

[AwwDeOhh]

Read this:
Before posting your measurement results