Analyzing different smoothing graphs - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 15 Old 01-11-14, 11:33 PM Thread Starter
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Analyzing different smoothing graphs

I have recently started with REW and before I make any changes to the room and speakers, I am still new to this and would like some interpretation from these graphs, mainly from the graph with no smoothing and how it compares to the other graphs.

The added detail at the higher frequencies with no smoothing, does this indicate cancellations from the first reflection? Just trying to understand these graphs more.

This was taken with the UMM-6 pointed up in the sweet spot of the speakers, about 8' back. The reason I'm asking is while the recordings sound good, I feel there is a slight lack in treble despite being a fairly neutral setup. Just a slight drop and it's not my aging ears..
Attached Thumbnails
Analyzing different smoothing graphs-1-3smoothing2.jpg  

Analyzing different smoothing graphs-1-6smoothing2.jpg  

Analyzing different smoothing graphs-1-24smoothing2.jpg  

Analyzing different smoothing graphs-no-smoothing2.jpg  

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post #2 of 15 Old 01-12-14, 02:02 AM
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Re: Analyzing different smoothing graphs

Hi initially the responses look very good, but look closer and the scaling is wrong please re-post with these settings reading this link http://www.hometheatershack.com/foru...ing-graph.html

Generally 1/6th smoothing (pretty much what the ear hears) or 12th smoothing is sufficient. For the bass region (0 - 300hz) it is good to look at No Smoothing but the above is fine as well.

Before you re-post please take a measurement of each speaker Left & Right individually, then combined and re-post with the correct scaling and smoothing.

You can also post the .mdat file.
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post #3 of 15 Old 01-12-14, 08:49 AM Thread Starter
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Re: Analyzing different smoothing graphs

Looks like I have a different version from the one in the link but I believe the graph is set correctly now. I used main speakers to check levels and record the measurement as I do not have a sub running at the moment.

Edited to add that this was the original measurements, I have not measured each speaker yet.
Attached Thumbnails
Analyzing different smoothing graphs-1-3-b.jpg  

Analyzing different smoothing graphs-1-6-b.jpg  

Analyzing different smoothing graphs-1-12-b.jpg  

Analyzing different smoothing graphs-no-s-b.jpg  


Last edited by adauphin; 01-12-14 at 08:52 AM. Reason: Content
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post #4 of 15 Old 01-12-14, 09:38 AM Thread Starter
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Re: Analyzing different smoothing graphs

Content removed, incorrect graph
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post #5 of 15 Old 01-12-14, 10:05 AM
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Re: Analyzing different smoothing graphs


Quote:
adauphin wrote: View Post
The added detail at the higher frequencies with no smoothing, does this indicate cancellations from the first reflection?
Not necessarily first reflections, just reflections in general. It’s scary I know, but fortunately things seldom sound as bad as an unsmoothed graph looks. As Phillips noted, 1/6- or 1/3-octave smoothing is a better visual representation of what things really sound like, at least in the upper frequencies. For subwoofer graphs, unsmoothed is preferable.


Quote:
This was taken with the UMM-6 pointed up in the sweet spot of the speakers, about 8' back. The reason I'm asking is while the recordings sound good, I feel there is a slight lack in treble despite being a fairly neutral setup.
Your graphs do show a 5-6 dB roll out above 3 kHz that might explain the lack of treble you’re hearing. However, it’s hard to tell definitively from the graph because it was generated with an upright mic. You can ignore all the recommendations you’ve no doubt seen recommending that method; they are wrong. You get the most reliable and accurate high-frequency measurements using a 0-degree calibration file and pointing the mic directly at the signal source.

Regards,
Wayne



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post #6 of 15 Old 01-12-14, 10:38 AM Thread Starter
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Re: Analyzing different smoothing graphs

This is in the listening position, mic pointed at the source.
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post #7 of 15 Old 01-12-14, 10:47 AM Thread Starter
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Re: Analyzing different smoothing graphs

I have tried to open the MDAT file to take screenshot and even attach it to no avail.
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post #8 of 15 Old 01-12-14, 10:48 AM
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Re: Analyzing different smoothing graphs


With 0-degree calibration file?

Regards,
Wayne



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post #9 of 15 Old 01-12-14, 10:59 AM Thread Starter
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Re: Analyzing different smoothing graphs

Quote:
Wayne A. Pflughaupt wrote: View Post

With 0-degree calibration file?

Regards,
Wayne
I have the calibration file from Dayton, not sure of their orientation. The file I tried to upload was from the measurement I just took, 0 deg, listening position. I have the MDAT file saved, but it won't upload.
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post #10 of 15 Old 01-12-14, 11:00 AM Thread Starter
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Re: Analyzing different smoothing graphs

Sorry if I have misunderstood...is the "0 deg" terminology pointing up or forward? My 0 deg graph is with the mic pointed at the speaker.
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