Help with reading my first REW graphs

[moves]

Unsmoothed is best for analyzing below 200 Hz. Above that, smoothing is recommended to prevent the graph from looking scary with the comb filtering.

Your bass has some serious nulls (the deep, sharp depressions). Can you give us a map of the room and your speaker locations, or some pictures?

Regards,
Wayne A. Pflughaupt

Yes of course... Here are some pictures of my room: The picture that seems furthest back is me standing with my back to the back wall. The room is 13 X 35ish feet... with that bar area about 10 X 10 feet. There is also a little 1.5 X 5 foot nook area to the right of the right speaker where there are some DVDs. I put a body pillow in the corner which seems to help a bit in the graph.

The last 3 pics with the panels on the walls is the set up that was used for the graph. I will be taking those dumb looking diamonds down and taking measurements to compare. I don't think they do anything but maybe...

https://www.flickr.com/photos/15461321@N04/albums/72157696965700761https://www.flickr.com/photos/15461321@N04/albums/72157696965700761

Thanks for looking and let me know what you think.

Thanks,

A

 

[moves]

Smoothing refers to one of the graph parameters you're posting. In preferences go to the analysis tab for choices. Might also like this article https://www.audioholics.com/loudspeaker-design/audio-measurements

Good article thanks for the ref.

 

[moves]

I took the diamonds off the wall and I was right that they didn't do anything. I mounted the bass trap and got a touch better but still need help locating the problems... any idea how to fix the spots around 40 60 and 100 Hz?

 

[everettT]

I took the diamonds off the wall and I was right that they didn't do anything. I mounted the bass trap and got a touch better but still need help locating the problems... any idea how to fix the spots around 40 60 and 100 Hz?

View attachment 25172

If your getting the minidsp, that can be EQed a little cut and a little boost between the 40 and 110hz regions. REW can apply what's needed to the minidsp.

 

[KEW]

I took the diamonds off the wall and I was right that they didn't do anything. I mounted the bass trap and got a touch better but still need help locating the problems... any idea how to fix the spots around 40 60 and 100 Hz?

View attachment 25172

If you have other placement options for your sub(s), try them out! Also just moving the sub 6" while keeping it roughly in the same place will give a different result.
Because these are below the Schrodinger frequency, they are more about the room than the sub (or amp or source). You are always best off getting it as good as you can before applying DSP!

 

[lovinthehd]

He said he isn't using a sub currently, but the same thing might go for trying different speaker placement....and still might play with the REW room simulator feature to see what it suggests with the room dims...

 

[moves]

Hey guys yea no sub. I guess I will try to move the speakers around. Can you EQ speakers with the minidsp? I think I want to build real thick panels and block the space to the right speaker under the shelf. There is currently carpet there but it acts like a box laying on its side. It might help.

 

[lovinthehd]

Hey guys yea no sub. I guess I will try to move the speakers around. Can you EQ speakers with the minidsp? I think I want to build real thick panels and block the space to the right speaker under the shelf. There is currently carpet there but it acts like a box laying on its side. It might help.

The minidsp could take two channels of info in, so maybe your L/R speakers if you can insert it into a loop in your avr (unusual in avrs) otherwise you could insert it between pre-outs and an external amp.

 

[yepimonfire]

I think it was just zoomed in because now I see 30.0 kHz.
I feel the blue line looks better than the green no? Next is how do I go about making it better? for example, how do I located the areas in the room that need fixing?
View attachment 25158

So I just put some panels on the walls and played around and I think this is the best result that I got.. Seems like there is an issue at 40 60 and 80 khz... how does this graph look? Is there anything I can do about all those squiggles in the higher frequencies?

View attachment 25161

I took the diamonds off the wall and I was right that they didn't do anything. I mounted the bass trap and got a touch better but still need help locating the problems... any idea how to fix the spots around 40 60 and 100 Hz?

View attachment 25172

Honestly that response is very good below 200hz. Unless the bass sounds bad I'd leave it alone. The HF squiggles are simply an artifact of room reflections, if you compare the graphs before and after you added the panels, you'll notice the variation is less extreme due to a reduction in the reflections. The in room response you have is nearly perfect.

Typically, you won't see a major benefit on a FR graph with mid and high frequency acoustic panel placement, but you will hear one. Depending on the room, speakers, and the placement, reflections can benefit or worsen the sound, particularly the imaging. You might just have to experiment and see whether or not it sounds better or worse to you with the treatments. For movies, I personally think reflections hamper the imaging and prefer a strong direct sound field. For stereo music, reflections help make up for the shortcomings of having only two speakers. Usually, it's a compromise. Too much treatment will make the room feel unnaturally dead, while a very reflective room may smear imaging, discrete impulse sounds, and worsen dialogue intelligibility.

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[William Lemmerhirt]

Honestly that response is very good below 200hz. Unless the bass sounds bad I'd leave it alone.
Unless I’m looking at a different graph, he’s got a 10-12db swing from 100hz to 300hz, and not to mention 48-100hz has a few that are 5- 10db. I feel that that would be noticeable and I think he’s thinking correctly about fixing that. As long as it doesn’t include a major renovation.
Just my opinion.



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[moves]

Well that's good to hear... Thanks for the last two inputs. I am a slight perfectionist so I will continue to try and solve the dips... at least between 40 - 110 Hz. I think I will put corner traps in the corners and maybe even cover the entire front wall with panels since it is concrete. We'll see....

Any more thoughts anyone?

 

[lsiberian]

That peak might be helped by adjusting your speaker to sub crossover. It's certainly a cheap trick to try.

 

[moves]

That peak might be helped by adjusting your speaker to sub crossover. It's certainly a cheap trick to try.

I don't have a sub

 

[lsiberian]

I don't have a sub

Sorry I know I read that and forgot. Old age is taking it's toll I suppose.

 

[yepimonfire]

I'm looking at it as an average response. For in room, it's still pretty good. EQ might be able to flatten it out a bit, but all I meant is that it might not sound that bad as is.

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[yepimonfire]

Dips usually come from either the proximity of the speaker to boundaries or proximity of the listener to boundaries. See if moving the mic forward or back solves it, if so, it's due to the listening position.

Well that's good to hear... Thanks for the last two inputs. I am a slight perfectionist so I will continue to try and solve the dips... at least between 40 - 110 Hz. I think I will put corner traps in the corners and maybe even cover the entire front wall with panels since it is concrete. We'll see....

Any more thoughts anyone?

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[moves]

Dips usually come from either the proximity of the speaker to boundaries or proximity of the listener to boundaries. See if moving the mic forward or back solves it, if so, it's due to the listening position.

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Great thank you I will try that!

 

[lovinthehd]

Are you just taking a single measurement at your seat?

 

[moves]

Are you just taking a single measurement at your seat?

Yes! Should I be doing more locations?

 

[yepimonfire]

Yes! Should I be doing more locations?

It helps to do 6-8 positions in a 2' area to see how the room is behaving.

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