Acoustic phase measurement - IR vs CSD

[domtw]

I am working on a new set of 2 ways speakers.
The tweeter is inside an independant box.
I made some measurements with the tweeter at different posistions, back from the medium-woofer.

I have an idea about the best position but I would like to know what you could say.

The measurements were done in my living room, so they are not ideal.
The microphone was about 1m away from the speaker, pointing between the 2 drivers.
The crossover is temporary and 6db/octave for both driver.

There are 2 types of measurement for each position:
- Cumulative Spectral Decay with Arta
- Impulse Response with DSSF3, RTA

I am waiting for your remarks on them.

You can download the images here.
http://www.filzup.com/download.php?id=053EF4691
Wait 50s before the "Télécharger" button shows up. Then click on it to download.

[doug20]

Thanks! Im learning as much as I can do you have the time to explain what Im looking at?

Also I have arta and I been running FRs using pink noise but nothing else. Is there any "How To" links for doing a Cumulative Spectral Decay exactly like you did?

[domtw]

From the main window, Record an Impulse Response Measurement.
Place the yellow cursor (left click) between the very beginning and the start of the IR signal.
Click the CSD Icon.
Choose
FFT=128
Window rise time=0.5
Max number of time slices=100
Slice shift=2
I am not exactly sure what everything means, I got this advise from someone else...

About the Sonogram reading, you can see the energy (color), according to the time (vertical axis from top to bottom) and the frequencies (horizontal axis)
You can see if the drivers are correctly aligned if all frequencies start rising together.
And also, the resonances, when some frequencies last for too long.
This is what I think I can read from that.
I would be very happy if some of you could help analyzing those CSD graphs.
:-)

[domtw]

No one ?
Can you access the files?

[David_Web]

Page won't load for me. Tested both IE and FF.

[doug20]

Originally posted by domtw
From the main window, Record an Impulse Response Measurement.
Place the yellow cursor (left click) between the very beginning and the start of the IR signal.
Click the CSD Icon.
Choose
FFT=128
Window rise time=0.5
Max number of time slices=100
Slice shift=2
I am not exactly sure what everything means, I got this advise from someone else...

About the Sonogram reading, you can see the energy (color), according to the time (vertical axis from top to bottom) and the frequencies (horizontal axis)
You can see if the drivers are correctly aligned if all frequencies start rising together.
And also, the resonances, when some frequencies last for too long.
This is what I think I can read from that.
I would be very happy if some of you could help analyzing those CSD graphs.
:-)

Thank you, I will try this when I get a chance this week.