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Old 21st January 2010, 12:34 PM   #21
Colin is offline Colin  United Kingdom
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I don't know if they're still around (or how good they are) but the old Motorola piezo tweeters could be added without additional components.
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Old 22nd January 2010, 05:43 PM   #23
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Quote:
Originally Posted by Colin View Post
I don't know if they're still around (or how good they are) but the old Motorola piezo tweeters could be added without additional components.
They don't work all that well unless they do have some additional XO componenets... running them down to where they XO naturally is what gave them their bad rep.

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Old 22nd January 2010, 08:43 PM   #24
mjf is offline mjf  Austria
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hello.
i make some experiments with a fullrange (fr10) and a tiny dome tweeter (sc5).
but this tweeter is built into the backside of the box (aside the midline,not symmetric).this does not enhance the sound volume (on front axis) but gives a better polar diagram and fine details solution ........and the "room" is anyhow different...............
tweeter xover : 1uf mkt - 1ohm res - tweeter 8ohm.
no xover at the fr (blue line in the sim).
greetings
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Old 23rd January 2010, 06:06 PM   #25
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Hello mjf,

i used that trick too in my fullrange dipole line arrays.

A (super) tweeter filling the polar dispersion in those
angles wich are neglected by the fullranger solves
the problem at its root.

I would bet, that also your "sweet spot" is wider now and
the speaker does not sound "dull" anymore when you listen
at greater distance ?

Kind regards
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Old 23rd January 2010, 07:44 PM   #26
mjf is offline mjf  Austria
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it is an experiment............the visaton fr10 sounds a little bit dull above 12khz........and that tweeter makes the high tones sound more transparent but not "louder on front axis or shrill".............i think i like this.
greets
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Old 23rd January 2010, 08:04 PM   #27
tinitus is offline tinitus  Europe
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omni tweeter may work in a similar way
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Old 24th January 2010, 03:49 AM   #28
dcathro is offline dcathro  Australia
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Quote:
Originally Posted by LineArray View Post
Hello mjf,

i used that trick too in my fullrange dipole line arrays.

A (super) tweeter filling the polar dispersion in those
angles wich are neglected by the fullranger solves
the problem at its root.

I would bet, that also your "sweet spot" is wider now and
the speaker does not sound "dull" anymore when you listen
at greater distance ?

Kind regards
So is it better to have the helper tweeter firing backwards rather than forwards?
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Old 24th January 2010, 04:50 AM   #29
tinitus is offline tinitus  Europe
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Yes, I think you will have more freedom to cross the backfire tweeter without xo on front FR
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Old 24th January 2010, 09:41 AM   #30
dcathro is offline dcathro  Australia
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Quote:
Originally Posted by tinitus View Post
Yes, I think you will have more freedom to cross the backfire tweeter without xo on front FR
Interesting!

I am going to be running my FR OB. I was thinking of supplimenting the energy above 6K with a forward firing Seas 1.5" dome, but I have also bought a pair of Saba 4" Greencones on ebay that could be run OB - will need to see how these sound compared with the Seas.

I I run the Seas firing backwards, I would connect it with inverse polarity so that it summed in phase with the rear wave?
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