dove
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Posts: 11
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Post by dove on Sept 29, 2019 16:03:36 GMT
Hi, I was hoping someone could help analyse my Mdats from REW eq wizard. Having carried out extensive treatment to my control room I have lost my acoustician unexpectedly. The room is not totally finished but we got to the point of adding a sub and a specified parametric eq (Behringer FBQ), both a surprise to me! The Mdats I have show the original Baseline measurements pre treatment. Then measurements with the specified treatment complete,then with a sub added and then finally with the first set of data input into the FBQ. It would be most helpful to get some analysis of the data I have by someone who knows how to read it properly. I have also included the sketchup files showing the treatment that has been installed pretty much to the letter,and a 360 image of the room we.tl/t-D3EYXUdk9G please note that the link can be downloaded for 7 days but I can always put it up again Many thanks in advance. |
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Post by Michael Lawrence on Sept 29, 2019 17:02:09 GMT
Hi dove-
I'm getting an error opening the file. Says it's "not in .mdat format."
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Post by rock on Sept 29, 2019 21:35:55 GMT
Please try to attach your images directly in your post. Attachments:
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dove
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Posts: 11
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Post by dove on Sept 29, 2019 21:41:50 GMT
Hi dove- I'm getting an error opening the file. Says it's "not in .mdat format." That's odd they open fine for me. I'm on a mac using REW vs 5.20 ?? |
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dove
New Member
Posts: 11
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Post by dove on Sept 29, 2019 21:43:39 GMT
Hi dove- I'm getting an error opening the file. Says it's "not in .mdat format." That's odd they open fine for me. I'm on a mac using REW vs 5.20 ?? I think they need to be opened with the REW software to view all the different images and analyse. There are so many different ways to view the readings.? |
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Post by Hexspa on Sept 30, 2019 5:34:18 GMT
See this thread for how to display the graphs. No offense but nobody wants to download random files from random hosts from new users. |
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dove
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Post by dove on Oct 1, 2019 8:00:26 GMT
_Apologies ,the unsolicited thing didn't occur to me. So here are the graphs as best as I understand the thread. Bear with me if I haven't done them correctly I'm not that confident with REW which is why I'm here I guess. Many thanks Treated room L+R speaker Treated room Bass L+R speaker Treated room decay 140ms L+R speaker  _  _  |
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dove
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Posts: 11
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Post by dove on Oct 1, 2019 8:01:41 GMT
 Treated room 1/3 smoothing Treated room waterfall  |
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dove
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Posts: 11
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Post by dove on Oct 1, 2019 8:07:23 GMT
untreated room  treated room  |
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Post by Michael Lawrence on Oct 2, 2019 3:45:16 GMT
The treatment has done its job tightening up the response. The final work to be done is with EQ. The "presence peak" rise between 2k and 6k is going to make existing material sound harsh, and if you mix material on a system with that curve, it will be lacking clarity and intelligibility on other systems. You will want to consider a wide parametric filter about 2 octaves wide centered around 4 kHz to tamp that back down. If you're mixing speech I'd leave the overall tonal response just about where it is. For music spectrum you will want a bit more of a tilt in order for your mixes to translate well on other systems.  Here are two different recording studio systems (note the different amounts of LF extension) in small control rooms with a pretty representative spectral tilt for how these rooms tend to end up. With a similar tilt, playback should sound natural and your mixes should translate well. |
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dove
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Post by dove on Oct 3, 2019 12:22:45 GMT
The treatment has done its job tightening up the response. The final work to be done is with EQ. The "presence peak" rise between 2k and 6k is going to make existing material sound harsh, and if you mix material on a system with that curve, it will be lacking clarity and intelligibility on other systems. You will want to consider a wide parametric filter about 2 octaves wide centered around 4 kHz to tamp that back down. If you're mixing speech I'd leave the overall tonal response just about where it is. For music spectrum you will want a bit more of a tilt in order for your mixes to translate well on other systems. Here are two different recording studio systems (note the different amounts of LF extension) in small control rooms with a pretty representative spectral tilt for how these rooms tend to end up. With a similar tilt, playback should sound natural and your mixes should translate well. Many Thanks Michael, that is spot on as regards to my actual experience with the room as is,mixes are a little harsh. Are you familiar with the Behringer FBQ2496. That is what is on the main outputs at the moment and I have 4 of the 20 bands left to play with.I believe I can adjust the Q value but not sure if it will go to 2 octaves. Here is the relevant section of the manual perhaps you could help me decipher what 2 octaves would be ,is it as simple as 2 ? 5. Turning the wheel changes the filter’s bandwidth. The 1/60 LED lights up if a value lower than 0.1 is set (1 x 1/60, 2 x 1/60 ... 5 x 1/60). In case of larger bandwidths, the value is shown directly in the display (0.1, 0.2 ... 1.0, 1.1...10.0). Also just to be clear are you saying the wide para eq would have a negative value to tamp down the peak? The other thing that hasn't been addessed is the side wall treatment.At the moment they are bare plaster,Here is an image to give you an idea.  I also have this 360 degree viewer of the actual room as is but apprectiate it is a link that you may not wish to open! kuula.co/share/7qMhW? fs=1&vr=0&autorotate=0.55&thumbs=1&chromeless=0&logo=0 many thanks again |
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Post by Michael Lawrence on Oct 3, 2019 13:30:38 GMT
That unit is a feedback destroyer, but the filters can be set fully parametric. There's absolutely no reason to be using 16 bands of EQ on a system. That is generally an indicator that you have a very serious problem somewhere else. I tune large-scale sound systems for a living, and if I use more than three filters on a system, I usually go looking for a problem. If you bypass the EQ completely and record the raw (unequalized) system response from your listening position I will attempt to help you place the filters appropriately. Make sure to measure L and R separately.
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dove
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Post by dove on Oct 3, 2019 15:44:09 GMT
  L+R speaker L Speaker R Speaker Here are the plots with the FBQ bypassed I was always uncomfortable with the FBQ but the explaination given was that it could operate a very tight Q's over multiple frequencies making it transparent? I have also included a screenshot of the current FBQ settings thank you Attachments:
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dove
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Posts: 11
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Post by dove on Oct 3, 2019 15:44:49 GMT
fbq settings  |
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dove
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Posts: 11
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Post by dove on Oct 3, 2019 17:47:09 GMT
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