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Old 7th October 2012, 09:44 PM   #101
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Here is an example of an economical monitor i designed for Sonics :Sonics Argenta Test Lautsprecher
I solved the diffraction problem with offsetting the tweeter. Pro Ac has pioneered that i think. It works very well.
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Old 7th October 2012, 09:56 PM   #102
gornir is offline gornir  Sweden
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Quote:
Originally Posted by Joachim Gerhard View Post
I did a lot of speakers with a flat baffle that sounded nice and by playing around with non textbook crossovers i got a rather flat response with good radiation pattern. If that is the wish, i can do that fast and easy. Then we have an entry level design that can be build by virtually everyone that doe snot have two left thumbs.
Yes, please go beyond that! To turn a good loudspeaker to an exceptional one requires to think outside the box and do design choices that isn't commercial justified as e.g. a more complex enclosure design.

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/Göran
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Old 7th October 2012, 10:16 PM   #103
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This guy makes a case that a phase linear and slim speaker images better. He can not answer the whys and hows convincingly i think :Loudspeaker Imaging Theorem
He also thinks that series crossover image better.
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Old 7th October 2012, 10:18 PM   #104
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Here is the famous LC Audio circuit :L C Audio Technology / Series Filter
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Old 7th October 2012, 10:20 PM   #105
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I did some research on series filters too but could not find a simple one that met my lobing criteria. Usually the tweeter ends up with a shelf in the lower reaches that makes phase matching to the woofer difficult. The series filters that behaved well in this regard ended up with even more components then a comparable parallel filter. I have not totally given up though.
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Old 7th October 2012, 10:30 PM   #106
gornir is offline gornir  Sweden
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Quote:
Originally Posted by Joachim Gerhard View Post
This guy makes a case that a phase linear and slim speaker images better. He can not answer the whys and hows convincingly i think :Loudspeaker Imaging Theorem
He also thinks that series crossover image better.
I wish it was simple as that, but in my experience there is so many factors to consider when creating a loudspeaker, so to say that that a slim speaker alone image better is to me nonsense. With a too narrow baffle you could as an example have internal side-wall reflection issues and the diffraction issues can be horrible, if not designed properly.

I've used off-set tweeters allot before, but found out that placing them correct on the center line with adequate baffle width and optimizing them from the 15deg off-axis measurements generally simplifies the design and make them sound better.

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/Göran
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Last edited by gornir; 7th October 2012 at 10:44 PM.
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Old 7th October 2012, 10:39 PM   #107
gornir is offline gornir  Sweden
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Quote:
Originally Posted by Joachim Gerhard View Post
Here is the famous LC Audio circuit :L C Audio Technology / Series Filter
They simply don't work!


I think Troel has written something about them.

crossovers

Series cross-over can be good in certain designs, but usually I think they doesn't cut it and I gave them up years ago.

Ooops now I might have offended someone religious!

Regards

/Göran
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Old 7th October 2012, 11:08 PM   #108
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I have more or less the same experience, universally they can not be used at all and i feel more comfortable with parallel networks. OK, lets do the speaker symmetrical.
Here is another idea for a cabinet.
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Old 7th October 2012, 11:11 PM   #109
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I have en even simpler and effective design i will start with. i am eager to listen to the drivers. Sorry that i did not publish the measurements on the woofer so far.
House cleaning on sunday prevented that. i will do that tomorrow.
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Old 7th October 2012, 11:35 PM   #110
gornir is offline gornir  Sweden
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Quote:
Originally Posted by Joachim Gerhard View Post
I have more or less the same experience, universally they can not be used at all and i feel more comfortable with parallel networks. OK, lets do the speaker symmetrical.
Here is another idea for a cabinet.
Yes, this one looks feasible, but I don't think you need the bevel on the tweeter baffle. Do the same round-over as on the mid-woofer.

This is an example of an off-set that really works without major issues:

The QM60 | Guru Loudspeakers

They guy (Ingvar Öhman) who made this loudspeaker is one of the worlds best designers and I challenge anyone to discuss loudspeaker designs with him. He's simply a natural born genius!

Regards

/Göran
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