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Old 19th February 2010, 08:42 AM   #3921
Jmmlc is offline Jmmlc  France
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Hello Michael,

IMHO the GD due to the crossover itself has not to be considered in that discussion because we yet see that we have solutions for the results of the summation of a low-pass and a high-pass crossover to have a (quasi) constant delay.

Then you try to compare GD in horns and in conventional loudspeakers. For conventional loudspeakers the load itself is at the origin of the GD non linearity. The closed enclosure operates as having a second order transfer function and a bass-reflex operates as having a 4th order tranfer function, with the corresponding phase non linearity). So there is theorically no main difference between horns and other loads. But in practice a high order load (as a BR) is rarely used to load a loudspeaker in the medium.


Best regards from Paris, France

Jean-Michel Le Cléac'h

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Originally Posted by mige0 View Post
What I want to clarify is something different - *if* on the example given you put a XO on top where the GD still looks good for now, *then* GD is back again at XO point - for any solution that can be realized passively at least...

Hence I said, I do not see how you ever will be able to "lower" GD (or increase useful BW) and also its no explanation that direct radiators seem to have quite different sonics in this department under comparable conditions regarding FR phase GD CSD etc....



Michael
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Old 19th February 2010, 02:41 PM   #3922
mige0 is offline mige0  Austria
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Did you guys ever look at the topic of this thread? Could you take all this rambling somewhere else?
A remarkable statement, Earl !

Are you in fear of just another "Waterloo" or are you t(s)elling us that horn honk - per se - does not apply to oblade spheroide horn contour ?
In the end - you know - there will be comparison of contours again – but I don't think we *have to* discuss the matter exactly here – so I start another thread:

Horn Honk $$ WANTED $$


Either way – regarding the formal frame of the issue under discussion, I'd like it to be it rather called a *thesis* about horn honk....

You are welcome to contribute at any time !



Michael

Last edited by mige0; 19th February 2010 at 02:47 PM.
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Old 19th February 2010, 04:48 PM   #3923
gedlee is offline gedlee  United States
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Originally Posted by ScottG View Post
As far as your contribution.. well that's up to you.
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You are welcome to contribute at any time !

Michael
I am careful about the posts that I respond to - there are a lot of jerks out there.
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Old 19th February 2010, 07:27 PM   #3924
ScottG is offline ScottG  United States
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Originally Posted by gedlee View Post
I am careful about the posts that I respond to - there are a lot of jerks out there.

It's never been about the poster, it's about the post.

If the post (or posts) have a fundamental problem (abusive or repeatedly off-topic) - then sure, take care in responding (or simply stop responding) to that particular grouping of posts.

As far as Michael, Jean-Michel, Dennis, songsc, or jzagaja - none of their recent posts appear to either be abusive OR off-topic. Michael's latest post? ..yeah, but it was a response to your post that was also abusive (..i.e. "rambling"). (..in that you can't expect to "give" and not "get back" in return.)

Again, what's the problem with discussing the effects/solutions of phase rotation at the waveguide's exit? -Frankly I would think that this particular topic would "play in" well with your preferred design.
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Old 19th February 2010, 10:01 PM   #3925
jzagaja is offline jzagaja  Poland
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JMLC-400 horn (red is EQ with minidsp kit) does not have any midband problem as in OSWG on the same driver. What's going on? Why BEM is not showing it?
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Old 19th February 2010, 10:31 PM   #3926
mige0 is offline mige0  Austria
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What's going on? Why BEM is not showing it?
What exactly BEM did not show you?

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Old 20th February 2010, 01:24 AM   #3927
soongsc is offline soongsc  Taiwan
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In the OSWG, the high end of spectrum is probably narrowing in directivity, and the low end increasing in loading. Using sims, it take a bit time to adjust them.
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Last edited by soongsc; 20th February 2010 at 01:26 AM.
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Old 20th February 2010, 03:14 AM   #3928
gedlee is offline gedlee  United States
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If the post (or posts) have a fundamental problem (abusive) - then sure, take care in responding
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Old 20th February 2010, 05:40 AM   #3929
mige0 is offline mige0  Austria
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Did you guys ever look at the topic of this thread?
Geddes on Waveguides ? !!
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Old 20th February 2010, 07:08 AM   #3930
soongsc is offline soongsc  Taiwan
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Does this mean nobody else can answer questions? If this is so, why not just write up what one person wants to say and put it in a different section for reference? There were so many questions left unanswered that we would have to either let the thread die or continue discussion regardless.
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