Asathor - a JBL 4367 Clone

[Morten73]

Hello gents!
Im wondering if theres any thing wrong with sloping the horn section of the Asathor?
The front baffel would stay the same. But I would like to slope the top and sides.

 

[Rese66]

Can you maybe make a drawing of how you would like it to be done?

 

[Morten73]

 

[Morten73]

Something like that.
Damn its been a long time since i drew anything by hand 😂

 

[Rese66]

Don't worry, I also have very little talent in drawing.

You can build it like that, no problem.

 

[hell67]

Buongiorno a tutti. Novità sulla costruzione dell'ASATHOR? Sono curioso perché voglio costruirli anch'io. Mi piacciono👍

 

[hell67]

Good morning everyone. Any news on the construction of the ASATHOR? I'm curious because I want to build them too. I like them👍

 

[thimios]

Back to the project.
I have managed to take some close field measurements.
I did separate measurements for woofer and Horn.
All measurements are at a distance of 10cm from driver .Where CON L,R,B.T are different mic position like LEFT,RIGT,TOP,BOTTOM at the same driver.
1/24 smoothing.
Please εcomment

 

[hell67]

Interesting . have you listened to them yet?

 

[thimios]

Not yet,i want to complete measurements first but i would like some comments about REW measurements that i have posted🙏

 

[Tom Kamphuys]

I think 10cm is too far for nearfield and too close for farfield. Could you elaborate some more on the measurements you made and how?

With the (very) limited experience I have, I would say you have some reflections in your data causing frequency wiggles in your FR.

 

[thimios]

Ok,even closer then.
1cm

 

[Rese66]

Measurements at such a short distance only make sense if you want to find out the behavior in the bass. As you can see, the bass runs quite linear between 100 and 50Hz - that means everything is fine.

For the rest of the frequency range, the measurement has no validity because the influence of the cabinet and the horn are not properly captured. Therefore, the measurements have hardly any significance.

 

[thimios]

Thanks for the answer.
Good to know that at least everything is good in bass area.
Now i will try to do the quasi-anechoic speaker measurements.
I hope this will be useful 🤔

 

[thimios]

This one is in the center of a small room 3x6m.
Mic distance from speaker=1m, in the high of the horn .
1/24 smoothing
Does it say something?

 

[Rese66]

Did you set a measurement window?
Horn and mic should be at half room height.

The dip in the midrange seems strange to me, though. Maybe you also take a picture of the measurement setup.

Edit:
Ah, just saw the "gated 3ms" in the headline.
Please show the measurement setup.

 

[thimios]

Βoth the measurement in post #592 and the one in post#595 lead to the same result.
The dip in the mid frequencies is clearly visible.
this is strange.
Seeing this, I decided to submit the crossover to a separate test.
Let's see the results, maybe that's where the problem lies.
Τhe crossover of the second speaker was connected to the output of an amplifier.
A frequency generator drove the amplifier.
The output of the amplifier was connected to first channel of an oscilloscope while the output of the crossover(Woofer) was connected to the second channel.
Please look at the pictures.
Green trace is the amplifier output.
Yellow trace is the crossover Woofer output.

 

[thimios]

The rest of the test.
Now for crossover horn output.

 

[sheeple]

Can you confirm that you have applied a gate to your measurements? The proper far field measurement must be taken from about 1 m distance, applying a gate that excludes the room reflections. Low frequencies must be measured separately in near-field and then spliced to the quasi-anechoic measurement, but for your cause, this can be skipped for now. In many rooms, the gate will be in the ballpark of 4.x milliseconds.
https://www.audiosciencereview.com/...ents-spinoramas-with-rew-and-vituixcad.21860/

 

[thimios]

Yes i can confirm that but i measure indoor.