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Multi-Way Conventional loudspeakers with crossovers

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Old 20th August 2008, 06:08 PM   #4401
mige0 is offline mige0  Austria
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Quote:
Originally posted by SunRa

Regarding the plasma tweeter, I was actualy thinking at this one here: Acapella Violon

What I've read about ion tweeters indicates that they cant have much headroom by priciple.

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Havent heard any Acapellas or other plasma speakers on horns, but would doubt if they can keep up - SPL wise - with the conventional mid horns as claimed

When I auditioned the omnidirectional Magnat plasma speaker it was at rather modest levels.




Greetings
Michael
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Old 20th August 2008, 07:05 PM   #4402
SunRa is offline SunRa  Romania
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Yup, plasma tweeters are having some really big problems in terms of SPL and ozone emission. I corresponded some time ago with an Italian inventor claiming he resolved the second problem by changing the frequency the oscillator circuit was working. He also used mosfets not tubes.

I dunno how the first problem can be resolved. How do you make the system more efficient? Increasing the temperature of the "flame"? And to what extent? I guess that when heating air some non-linearities will finally start to show-up.
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Old 25th August 2008, 04:10 PM   #4403
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Lynn.. or John A if you are there ...
Have you got any tips & tricks for reaching John Atwood ?
I fear his 'guilty until proved innocent' spam filter may be stopping me reaching him on the one-electron email .
I would very much like to contact on how his own evaluations of the GPA 288-H are going , and other general speaker observations .
I'm on the usual Qioptiq email as on your mailing list .
Cheers,
Mark
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Old 26th August 2008, 06:06 AM   #4404
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Done. Contact message sent to both parties.
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Old 26th August 2008, 08:51 PM   #4405
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Thanks Lynn , sent a rambling message off to John .
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Old 27th August 2008, 12:37 AM   #4406
sba is offline sba
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Default Altec Duplex

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Quote:
As far as I know, the Hiraga 604 is the series II from GPA (ferrite) with a multicellular horn that he adds himself.

Years ago, when I was just a kid, I had an Altec duplex in my hifi system. It was a 604b, a late 1940's model--with alnico and multicellular horn. Back then I knew nothing about alnico, or about compression drivers; I only knew that my Altec looked cooler and sounded better than anything else I had come across.

So it's interesting to see Hiraga's beautiful system using a horn that looks identical to the Altec 604b horn, which had six cells. Mmmm....I wonder if a 604 with multicellular horn (and alnico!) can be ordered from GPA! And I wonder why Altec dropped the multicellular horn...to cut costs?

Here's a photo of a mint 604b that sold last year.
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Old 27th August 2008, 12:40 AM   #4407
sba is offline sba
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Old 27th August 2008, 02:15 AM   #4408
sba is offline sba
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Old 27th August 2008, 02:46 AM   #4409
sba is offline sba
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Old 27th August 2008, 03:23 AM   #4410
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They would do better off using the Urei horn. It measures and sounds better.

Rob
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