What does this mean?

  • Thread starter Thread starter Fiddlermatt
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Fiddlermatt

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All my gear got in, and I ran a check on my room's frequency. The only problem is I have no real clue what it means. There is a peak in the 100-200hz range; I have bass traps almost finished so that should be taken care of. It's the high end that bothers me. It's all crazy looking past 3-4khz. What does that mean? I think I have some flutter echo/comb filtering issues, but the highs are also quite a bit low (if that makes sense.) It almost seems to me like I need both more and less reflections at the same time! I could sure use some help interpreting this!
 

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Have you played any reference tracks in the room, or are you just going by measurements?
 
Yes, they sound "okay", but I have no real basis to be objective about them. I also use this room for tracking, and instruments that require some room ambiance, such as violin or acoustic guitar, sound flat and lifeless.
 
Oh, that helped quite a bit! Here's an updated image with smoothing.
 

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Great. Now you have to distinguish between the speaker's response and what the room is doing and a simple frequency response isn't going to help. The waterfall display will tell you something about what frequencies are resonating. I assume you're using an actual reference mic.
 
Just bass trap the hell out of the place and forget about measurements. Without knowing anything about your oom, I'm guessing you'll need bass traps in all 4 corners, a cloud over your listening position, traps at your first reflection points. That should be a good start.
 
1/6 octave smoothing is helpful for overall trends but not really for analysis. You'll want to do 1/24th or 1/48th octave smoothing for full range measurements and you'll want to do no smoothing when looking at the bass ranges. By the way, there's no use with your view - restrict the frequency from like 30Hz to 10kHz for full range measurements and about 30Hz to 300Hz for looking at the bass ranges, and restrict the dB to about 40-90dB
Really though you'll want to look at the waterfall graphs for a much better idea of what's going on in the room. I wrote an article a few months ago about the waterfall graph on our site here: Understanding Decay Time and Waterfall Graphs - GIK Acoustics
 
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