Dirac with and without REW results

[Firewalk61]

Hi all. I’m totally new to the EQ/measurement game. I have just run REW showing with and without DIRAC results. Attached pics. Can anyone advise on the results. I’m new to this so I’m not entirely sure if the result without was good in the first place and or what I need to be concentrating on correcting and how to if I need to. Any advise would be much appreciated. Thanks in advance

 

[Keith_W]

Please read this. Make sure the measurement has been taken properly.

If you want to compare the two curves, do this:

- apply 1/6 smoothing to both. You are currently using 1/48.
- go to the "ALL SPL" tab and select the two graphs. Make sure they are overlaid over each other.

It looks as if you have too little bass and too much top end. It starts to drop off a cliff below 80Hz. That's not Dirac's fault, that's your speakers and no subwoofer. Dirac has tried to fix this by giving you more bass down to 60Hz, but that may have side effects, e.g. increasing distortion.

The best way is to upload your .MDAT to ASR so that we can look at it. You need to zip it first.

 

[Firewalk61]

Thanks for the response I’ll take a look now. What I can say which was really strange during measurements was that..when I did a test sweep with just L or R then I felt the sub and I could feel it kick in but when doing the sweep or measurement with L+R I could not feel it kick in

 

[Firewalk61]

here we go

 

[Keith_W]

Both your measurements are "with Dirac" and left and right measurements together. Your question was, "what has Dirac done" so I need the "before" measurement. Please upload the following:

- Left and right speakers + subs INDIVIDUALLY, BEFORE Dirac
- Left and right speakers + subs INDIVIDUALLY, AFTER Dirac

Don't measure left and right speakers together because it makes the measurement very difficult to interpret.

Also advise what speakers you are using and how many subs, and how you took the measurements. Please take time to read the thread I linked before posting again.

 

[Firewalk61]

hi apologies. I have re-measure both L+R with subs with dirac on and off as shown.
My speakers are Dali Rubikore 2 on stands with 1 x SVS SB3000 Sub

 

[Keith_W]

Thanks for posting the graphs. Let's go through some of them.

Left graph is the left speaker, right graph is the right speaker.
Red/Green: before Dirac
Blue/Yellow: after Dirac

You can see in both "before" graphs that the subwoofer is set way too high, it's about 12dB too loud. Dirac has cut down the subwoofer too much. You want the bass to look something like this:

This is your "after Dirac" measurements L/R with a target curve drawn in. You are missing about 7dB of bass. It's not as if your speakers/subs can't do it, we can see that your subs are able to produce more bass than you need. Also, the top end (above 2kHz) looked OK before Dirac. Dirac boosted it! The result would sound a little bright and thin.

Don't ask me why Dirac chose to cut so much bass. I don't use Dirac. Maybe someone on ASR who uses Dirac can chime in. Would you be able to show us what target curve you used with Dirac?

I had a look at the rest of your measurements and I can see a lot of very loud and very early reflections. Read the thread I linked and look for my comments on how to read the Energy-Time Curve, then go look at your own. Are you measuring with a mini tripod? If so, throw it in the trash can immediately and go buy yourself a proper mic tripod.

 

[Mort]

@Firewalk61 , maybe you can screenshot your DiracLive curve and target? How did you set the bass there?

 

[Firewalk61]

Thanks for posting the graphs. Let's go through some of them.

View attachment 439908View attachment 439909

Left graph is the left speaker, right graph is the right speaker.
Red/Green: before Dirac
Blue/Yellow: after Dirac

You can see in both "before" graphs that the subwoofer is set way too high, it's about 12dB too loud. Dirac has cut down the subwoofer too much. You want the bass to look something like this:

View attachment 439910

This is your "after Dirac" measurements L/R with a target curve drawn in. You are missing about 7dB of bass. It's not as if your speakers/subs can't do it, we can see that your subs are able to produce more bass than you need. Also, the top end (above 2kHz) looked OK before Dirac. Dirac boosted it! The result would sound a little bright and thin.

Don't ask me why Dirac chose to cut so much bass. I don't use Dirac. Maybe someone on ASR who uses Dirac can chime in. Would you be able to show us what target curve you used with Dirac?

I had a look at the rest of your measurements and I can see a lot of very loud and very early reflections. Read the thread I linked and look for my comments on how to read the Energy-Time Curve, then go look at your own. Are you measuring with a mini tripod? If so, throw it in the trash can immediately and go buy yourself a proper mic tripod.

Thanks for taking the time to look into this for me. I will look at the thread on energy-time curve. I am using a microphone tripod to measure with. I have also attached the Dirac response to the measurement

 

[Firewalk61]

@Firewalk61 , maybe you can screenshot your DiracLive curve and target? How did you set the bass there?

just posted

 

[kyuu]

just posted

What? You posted REW measurements. What Mort is asking for is screenshots from Dirac, showing the curve and target results.

 

[Firewalk61]

What? You posted REW measurements. What Mort is asking for is screenshots from Dirac, showing the curve and target results.

i just posted the Dirac results with the target curve above my response to him

 

[Keith_W]

That target curve looks OK to me. A bit strange that Dirac should cut the bass by so much. Maybe try redoing the Dirac DSP process.

 

[kyuu]

Ok either something screwy is going on because of the forum upgrade, I'm blind, or I don't understand what's going on. Not a big deal if it's just me, just was curious and wanted to help since I use Dirac.

I'm looking for something like this:

 

[Mort]

It's this from a few posts up. That looks ok, can we see the subwoofer group>

 

[Firewalk61]

how do you get the SPL reading on the left to read how you have changed it having it set 0 more or less at target then +10db and -10db etc on REW

 

[Firewalk61]

I have just re-measured and closed curtains on Dirac target from 2k onward. i have two sets of readings here. One without Dirac L/R and one with Dirac with a 10Db Harmon Curve and curtain shut after 2k

 

[Mort]

Those look a lot better than your first post.

 

[janbth]

I have just re-measured and closed curtains on Dirac target from 2k onward. i have two sets of readings here. One without Dirac L/R and one with Dirac with a 10Db Harmon Curve and curtain shut after 2k

In the screenshot from Dirac, it looks like you have selected the left speaker (on the right hand side). How does it look if you select the subwoofer?

 

[Firewalk61]

hey so i have been playing around..shoot me now and tell me WTH have you done..but ok so attached is my latest REW showing L/R before and after Dirac and also the L+R after dirac now. I have also attached the dirac sub curve SS and the Dirac live L speaker curve which i have manually moved the points around to achieve what is now showing in REW. This manual curve looks so wrong with the way i have moved the curved into a more zig zag postion but it seemed to smooth the response when i measured in REW afterwards. Please tell me if this is ludicrous and i should immediately put it back to a smooth curve in dirac Also, is there a way to manually move measurement points individully for both the left and right speakers? If i move the points in the L speaker then it replicates in the R