Dirac - Result Graphs, help tuning and REW

[geebo]

Jul 3, 2016 11:11:11 GMT -5 dkaudio said:

Thanks, I ran it all again with the Socketman cal file.

Dirac Fronts


Dirac Center


Dirac Surround


Dirac Sub 1


Dirac Sub 2


After running Dirac I ran REW again as well.

REW all 5 speakers
(red is left surround, green is left front, blue is center, magenta is right front and aqua is right surround)


REW both subs
(green is front sub, magenta is back sub)

The dropout around 7kHz is very curious. I wonder if it could be a defective mic. Something isn't right though and the mic is the first thing I'd suspect. How does it sound with Dirac right now. Is it on the bright side. I'm thinking Dirac might try to compensate in the 7k area with the result being a bright and maybe even shrill sound.

[geebo]

And the Dirac "before" traces show greater output at 500 than at 40 for those subs. Very odd.

[Deleted]

Hey Dan, do 3 rew sweeps with your subs.. One front one rear and one with both.. I got your email but couldn't get connected to internet..
The 7khz roll looks like either room interactions or faulty mic.. Do a sweep of a speaker.. Maybe center as it's all by itself anyway. And place the mic within an inch of the speaker. This will eliminate room interactions. Be sure to adjust the volume for this as well.

[dkaudio]

Here is the center channel REW with the mic right next to it...


Here is REW both subs alone then together...

[Deleted]

You are one of the lucky ones on your subs...

Which driver was the mic in front of on the center?
Looks like your mic isn't measuring right though. You would expect it to be a nice smooth response. Is that with or without dirac ?

[dkaudio]

That was with Dirac, USB steam, all stereo. My center has two woofers with a mid and tweeter in the center. I had the mic in the middle but still pointed towards the ceiling.

[Deleted]

Jul 4, 2016 16:54:02 GMT -5 dkaudio said:

That was with Dirac, USB steam, all stereo. My center has two woofers with a mid and tweeter in the center. I had the mic in the middle but still pointed towards the ceiling.

How does it look without dirac?
I know.. I know... Lol..

Doing it this way should theoretically give you as close to an anechoic or outdoor measurement you can get without hauling a bunch of gear put into the back yard. The speaker "should" have a fairly flat response.

[dkaudio]

Jul 4, 2016 17:53:30 GMT -5 fattykidd said:

Jul 4, 2016 16:54:02 GMT -5 dkaudio said:

That was with Dirac, USB steam, all stereo. My center has two woofers with a mid and tweeter in the center. I had the mic in the middle but still pointed towards the ceiling.

How does it look without dirac?
I know.. I know... Lol..

Doing it this way should theoretically give you as close to an anechoic or outdoor measurement you can get without hauling a bunch of gear put into the back yard. The speaker "should" have a fairly flat response.

USB stream, Preset 1, All Stereo, center channel only with the mic up close.

[Deleted]

Sweet Jebus man...
Either that mic is WAY out to lunch or your speakers are pooched..

Does it sound way off balance? Like someone has put 3 hoodies over your ears..

[dkaudio]

It doesn't sound extremely far off to me or anything. I watched a movie at -15 and I did get some listening fatigue pretty quickly.

Am I not setting something up right in REW?

[Deleted]

In the mic meter tab up top.. That's where you enter the calibration file

You've entered the mic cal file for the soundcard in your "pc". Definitely could present an issue.

[dkaudio]

Oh shoot, haha. I deleted the soundcard cal file and added it in the mic tab.

Here is the center channel close up. Red is Dirac and brown is Preset 1

[Deleted]

It's still super odd to have a close up measurement that looks like that.. It's a 20db drop at 3khz.

[geebo]

I'd get that mic checked. Call Emotiva.

[dkaudio]

Maybe it is the way the mic is positioned? It is above the midrange more in line with the tweeter pointed at the ceiling. Maybe it should be between the two drivers?

[Deleted]

It drops like a rock where the tweeter should be outputting it's frequency band.

I'm with geebo. Get the mic checked.

[KeithL]

Before doing anything I would try the mic further back.
It's not at all unusual to have a notch because of cancellation between two drivers at a certain frequency.
(Move the mic around... if the frequency of the notch moves, then it's probably some sort of cancellation.)

I would also consider trying it with a few different speakers.

(While it's possible that there's a problem with the microphone, an anomaly with the speaker, or some sort of reflection/cancellation from a nearby surface, is more likely.)

[Deleted]

Jul 5, 2016 9:52:11 GMT -5 KeithL said:

Before doing anything I would try the mic further back.
It's not at all unusual to have a notch because of cancellation between two drivers at a certain frequency.
(Move the mic around... if the frequency of the notch moves, then it's probably some sort of cancellation.)

I would also consider trying it with a few different speakers.

(While it's possible that there's a problem with the microphone, an anomaly with the speaker, or some sort of reflection/cancellation from a nearby surface, is more likely.)

He's experiencing the same drop in all 5 of his speakers.. From close range measurements to across the room..
A 20db drop for a span of 7khz is a little more than an anomaly.

[dkaudio]

They are going to send a replacement mic sometime this week, I'll update this thread once I get it. Thank you so much for all the help, although I've seen hundreds of frequency graphs before, this is the first time I've done the measuring and tried to interpret things.

[Deleted]

For me. The tuning is half the fun.
It's interesting to compare what you hear to what the data says.