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Help interpreting room acoustics measurements
Help interpreting room acoustics measurements
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Old 18th August 2017, 01:50 PM   #11
Pano is offline Pano  United States
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Help interpreting room acoustics measurements
Ha ha, yes possibly your ears. To be honest, I don't see the 1K echo in your graphs. But I know the sound well, it's typical of bare rooms with gypsum board walls.
Do try REW, it will run on the Mac and is a common platform here. Plus you can upload your REW files for others to look at and analyze.
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Old 18th August 2017, 03:41 PM   #12
eriksquires is offline eriksquires  United States
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I don't see very convincing evidence for a slap echo except as I mentioned, just below 100 Hz is a little odd. It may also be noise we're looking at.
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Old 20th August 2017, 09:44 AM   #13
fluid is offline fluid  Australia
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Quote:
Originally Posted by kaputt View Post
@fluid I'll try a longer sweep, maybe 10 seconds? Might doing sweeps with a limited frequency range be helpful? Like sweep 20Hz to 200 Hz in 5 seconds?

Another thing: when I wrote that I can hear the ringing of the room for two seconds after the sweep is done I only assumed that there is an issue with my measurements. Is it possible that my ears are ringing and not the room?
The graphs look pretty normal. Using longer sweeps is unlikely to change the graphs, it was more to demonstrate that the sound you hear is very different due to the time the energy is released over. I don't recommend listening to the sweeps unless you have to, particularly if they are loud. I set REW to start after a few seconds delay and walk out of the room. Limiting the frequency range is fine if you are only interested in that range but it won't change the result.

What is it that you are trying to achieve with measurements?
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Old 20th August 2017, 10:20 AM   #14
wesayso is offline wesayso  Netherlands
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Quote:
Originally Posted by Pano View Post
Ha ha, yes possibly your ears. To be honest, I don't see the 1K echo in your graphs. But I know the sound well, it's typical of bare rooms with gypsum board walls.
Do try REW, it will run on the Mac and is a common platform here. Plus you can upload your REW files for others to look at and analyze.
Pano brings up a valid point, lets focus on that room for a bit, what is it like?

Let me describe two scenario's: I'm living in an old house, dating back to 1927. It has some curtains and a wooden floor. A couch made of fabric, a carpet in the center. If I clap my hands walking trough the room I don't perceive a clear echo. It became even better after hanging 3 large damping panels in it.
When filled with more people talking I have no problem separating the conversations.

My sister lives in a more modern house. No curtains, leather couches, hard materials everywhere, concrete floors... just having a conversation at a birthday party while more people are speaking makes it obvious it's acoustics are largely different. I didn't clap my hands, walking around in that room, but to get good audio there I know it would need more work than my room.

Aside from the room, there's still a possibility the echo comes from within the measurement chain. But lets talk about the room first. Do you recognize something of the two scenario's I gave here?
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