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Multi-Way Conventional loudspeakers with crossovers

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Old 16th December 2010, 11:18 PM   #41
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Hi, i looked up his site too several times and find it usefull as well. Where i have problems with is the ratings he gives. That can give an otherwise good product a bad reputation that uses a driver that was rated poorly.
The driver alone does not tell the whole story.
Of cause you can not make a purse from a pigs ear.
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Old 17th December 2010, 12:00 AM   #42
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Joachim Gerhard View Post
Hi, i looked up his site too several times and find it usefull as well.
Where i have problems with is the ratings he gives. That can give
an otherwise good product a bad reputation that uses a driver
that was rated poorly.
The driver alone does not tell the whole story.
Of cause you can not make a purse from a pigs ear.
Hi,

You may be right about a small DIY company and that has happened,
not that he gave it a poor rating, he didn't say it was utterly brilliant.

But its part of the terms and conditions of submitting drivers for testing.

Most drivers live or die on being fitted to commercial speakers and I
don't think Z has that much real influence, except for DIY diehards.

e.g. : Parts Express DIY Project
There are so many things about this I don't like Z's tweeter rating
is just another piece of the puzzle, not the be all and end all.
Will Z's rating stop people buying all the bits ? Not at all IMO.

rgds, sreten.
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Old 17th December 2010, 12:41 AM   #43
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Yes, i agree. I over reacted.
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Old 17th December 2010, 02:27 AM   #44
soongsc is offline soongsc  Taiwan
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Quote:
Originally Posted by Joachim Gerhard View Post
...The driver alone does not tell the whole story.
Of cause you can not make a purse from a pigs ear.
A good dish can be made from pigs ear.

In any case, it's best to use the best driver one can afford because that is the final limit on how good the design can get.
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Old 17th December 2010, 03:23 AM   #45
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Hello,
Is that tear drop shaped tweeter for an organic visual appearance or to reduce diffraction. The sphere has a similar visual appearance and no sharp edges to cause diffraction?
It seems that as frequencies go higher the tweeter will have a narrowing lobe and the edges if any become less important or at least having a lesser impact to the lobeing of the acoustic image.
Or to put the question a different way; if the tweeter is mounted in an infinitely large flat panel there are no edges to cause diffraction, how will the performance be different from a tweeter mounted in a small sphere or teardrop?
DT
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Old 17th December 2010, 06:24 PM   #46
sreten is offline sreten  United Kingdom
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Originally Posted by DualTriode View Post
Hello,
Is that tear drop shaped tweeter for an organic visual appearance or to reduce diffraction. The sphere has a similar visual appearance and no sharp edges to cause diffraction?
It seems that as frequencies go higher the tweeter will have a narrowing lobe and the edges if any become less important or at least having a lesser impact to the lobeing of the acoustic image.
Or to put the question a different way; if the tweeter is mounted in an infinitely large flat panel there are no edges to cause diffraction, how will the performance be different from a tweeter mounted in a small sphere or teardrop?
DT
All just for fun!
Hi,

Zaph|Audio

FWIW the tweeter measures laudably flat when used as intended
and one could expect more distortion as it will be working harder
with its wider dispersion at the bottom end of its range, but the
performance as you go lower than 4kHz does take a progressive
nosedive, which does make it difficult to use for some 2-ways.

Compare the lower range distortion to the Vifa next to it.

rgds, sreten.
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Old 17th December 2010, 06:37 PM   #47
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Soon, I am a bit limitted in the choices i have. The VIVA OX tweeter meets my requirements well. I wanted to use a 19mm dome in a tiny cabinet. When this thread proceeds you will see that i will use a quite high crossover frequency if posible. The Scan wideband is very extended and has good dispersion up to a point. The VIVA OX has some "nosedive" ( i have heard that phrase for loudspeakers here the first time, i though it was a word from aviation ) around 2kHz and recovers somewhere deeper. If i can avoid that region with a 5kHz xover i will be fine i hope.
A tweeter put on a wide baffle compared to a tweeter in "open air" will have a very different off axis response. The total energy will be the same though under the conditions that the baffle is very wide in one case and the cabinet very small in the other case.
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Old 17th December 2010, 07:12 PM   #48
sreten is offline sreten  United Kingdom
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Hi,

To get back to the topic of low diffraction and / or wide dispersion speakers
I guess SL's Pluto should be mentioned. It doesn't do it to the highest treble,
but its certainly a "low diffraction" "wide dispersion" design, is it not ?

PLUTO-2.1 omni-directional loudspeaker

Click the image to open in full size.

Don't discuss it here, that not the point, but for those interested
the "Concepts" section might be interesting background reading.

rgds, sreten.
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Old 17th December 2010, 07:21 PM   #49
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Just one anekdote Sreten. When i asked Siegfried why he has not put the tweeter exactly over the midle of the midrange he told me that he got a very ragged response that way, due to reflexions. He has then put the tweeter more forward and uses a allpass instead for alignement.
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Old 17th December 2010, 07:32 PM   #50
sreten is offline sreten  United Kingdom
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Originally Posted by Joachim Gerhard View Post
Just one anekdote Sreten. When i asked Siegfried why he has not put the tweeter exactly over the midle of the midrange he told me that he got a very raged response that way, due to reflexions. He has then put the tweeter more forward and uses a allpass instead for alignement.
Hi.

Yes. given the c/o point they don't have to be that close (with inevitable
mid/treble reflections) do they ? There are always different approaches.
You could offset the mid/tweeter to one side and increase spacing.

rgds, sreten.
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Last edited by sreten; 17th December 2010 at 07:34 PM.
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