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Multi-Way Conventional loudspeakers with crossovers

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Old 3rd August 2010, 06:21 AM   #6971
g3dahl is offline g3dahl  United States
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So, I'm not crazy after all? Yay!

Gary Dahl
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Old 3rd August 2010, 07:20 AM   #6972
soongsc is offline soongsc  Taiwan
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Quote:
Originally Posted by dantheman View Post
Soongsc, you've quoted my spectrograms before. This is not new information. Then I followed it with similar examples just to give a different look. I must be missing something because it sure seems like we new what the problem was 3 pages ago. It was obvious. Can we move on. The wild theories didn't pan out and the simplest one did. I swear I almost can't figure out why I posted this stuff. I thought it was going to be helpful. Silly me. Perhaps someone with more "experience" should restate it. Then we can thank them and move on.

Dan
I believe I was asking some questions in the "measurements" thread. But I don't know why this kind of response in this thread. Did you design the software and feel annoyed when I use it as reference for discussion?
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Old 3rd August 2010, 07:51 AM   #6973
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Perhaps a silly thought - any possibility that it could be reflections from the inside of the basket legs?
Or have these been treated with felt or similar?

Cheers,

Alex
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Old 3rd August 2010, 09:29 AM   #6974
Elias is offline Elias  Finland
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Hi,

I suggest using wavelets with reassignment to see reflections and diffractions in both frequency and time domain.

The "Horn Honk" thread has many examples.

Click the image to open in full size.


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Old 3rd August 2010, 10:15 AM   #6975
mige0 is offline mige0  Austria
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Hi Elias

glad to see you join the discussion.

Could you perform your wavelet analysis on the IR files at hand.
I already did, but my plots are not as revealing as yours (always several steps behind - you know..)

The strange thing with this driver seems to be that there is a clear built up in resonance - not exactly what we usually see with looped reflections in horns.
An other explanation possibly would be, that we have a beat of two effects that cause a "come and go" of that resonances (interacting of different modes of cone flexing for example).

Anyway a really strange speaker behaviour worth to look at in detail.


Michael

Last edited by mige0; 3rd August 2010 at 10:19 AM.
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Old 3rd August 2010, 10:17 AM   #6976
mige0 is offline mige0  Austria
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After all the work I've done during the past several days, maybe I should get paid!

Gary Dahl

For that - and - for bringing this thread alive !

Michael
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Old 3rd August 2010, 01:42 PM   #6977
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Quote:
Originally Posted by soongsc View Post
I believe I was asking some questions in the "measurements" thread. But I don't know why this kind of response in this thread. Did you design the software and feel annoyed when I use it as reference for discussion?
Soongsc, it's in reference to your suspicion of a cone resonance around 2k that you posted 2 posts before my last. We already know it does, you've already seen it in the polar plot and the spectrogram and the impulse. It's just that simple, no reason to re-rediscover it again.

Please can we now end this discussion? Unless we are going to try to fix it, but it seems Gary is content with crossing it over low.

Sorry for getting annoyed, but I hate rehashing the same thing over and over. Yea I know, then why post in this thread?...... Life is too short.

Oye,

Dan
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Old 3rd August 2010, 01:46 PM   #6978
Pano is offline Pano  United States
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Originally Posted by g3dahl View Post
So, I'm not crazy after all?
Well, let's not go that far, shall we? We need to wait for more evidence.
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Old 3rd August 2010, 02:27 PM   #6979
soongsc is offline soongsc  Taiwan
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Quote:
Originally Posted by dantheman View Post
Soongsc, it's in reference to your suspicion of a cone resonance around 2k that you posted 2 posts before my last. We already know it does, you've already seen it in the polar plot and the spectrogram and the impulse. It's just that simple, no reason to re-rediscover it again.

Please can we now end this discussion? Unless we are going to try to fix it, but it seems Gary is content with crossing it over low.

Sorry for getting annoyed, but I hate rehashing the same thing over and over. Yea I know, then why post in this thread?...... Life is too short.

Oye,

Dan
Well, I don't recall anyone pointing out the possibility of interaction between the cone and surround. I don't think anyone pointed out the shape of the wriggles discussed. Seems Gary is also interested in this. So why get annoyed? I would not have even posted the 2Khz issue if the discussion was not on-going. To be honest, I thought it was just some reflection untill I looked at the shape of the wriggle.
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Old 3rd August 2010, 03:09 PM   #6980
soongsc is offline soongsc  Taiwan
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Inspired by Lynn's mic setup and Gary's mic installation mod; I finally found a way to put together a mod that will integrate existing mic and preamp with the mic stand. A brass tube relaces the original mic holding tube, on one end is the mic preamp, on the other end is the mic.
The next time I get to do some measurements, I'll post any differences I see.
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