Does anyone have experience with the Murata hemispherical piezoelectric ceramic super tweeters? I think they were unveiled at the 2001 CES.
http://www.murata.com/catalog/p57e.pdf
-Casey Walsh
http://www.murata.com/catalog/p57e.pdf
-Casey Walsh
SmarmyDog said:
With a frequency operating band starting at 15 kHz and extending to 100 kHz this isn't your typical super tweeter. I'll bet these would be great for chasing away field mice. I didn't hear reports of any mice being spotted at the 2001 CES did you?
My own hearing that once extended to 21 kHz when I was in my early 20's is now dead at just over 15 kHz. I wouldn't even hear these.
Doesn't mean I wouldn't buy them though. My home is on country farmland and I have lazy, well fed cats. 
Piezo tweeters
Years ago (so many I can´t remember) I used a pair of those
exactly same tweeters. The funny thing about the crossover
is we must have taken the schematic from the same spot
because it was very similar.
I tryied different values, but to my ears the sound was really
bad, so bad that I gave up on them.
Another funny thing is, I STILL HAVE THEM, I hate to throw
things away and keep stuff laying around (well, not exactly, but
statched away) for years and years...
But I´m not going to do anything with them, I was able to
get good speakers in the last few years so....
May be I can get rid of them in a flea market this year!
Years ago (so many I can´t remember) I used a pair of those
exactly same tweeters. The funny thing about the crossover
is we must have taken the schematic from the same spot
because it was very similar.
I tryied different values, but to my ears the sound was really
bad, so bad that I gave up on them.
Another funny thing is, I STILL HAVE THEM, I hate to throw
things away and keep stuff laying around (well, not exactly, but
statched away) for years and years...
But I´m not going to do anything with them, I was able to
get good speakers in the last few years so....
May be I can get rid of them in a flea market this year!
Re: Piezo tweeters
What driver?
That Motorola?
Have you tried a very low value cap, like 470~560nf?
1uf already sounds bad. They are very sensitive in the midband.
Also, the value of the resistors (mainly the parallel one) is critical, to attenuate the tweeter to the level of your mid/woofer.
You spend some time to tune it by ear, but it pays.
jmateus said:
What driver?
That Motorola?
Have you tried a very low value cap, like 470~560nf?
1uf already sounds bad. They are very sensitive in the midband.
Also, the value of the resistors (mainly the parallel one) is critical, to attenuate the tweeter to the level of your mid/woofer.
You spend some time to tune it by ear, but it pays.
Don't forget that Anthony Gallo's speaker is based on a treble unit that he made that is a piezo.
also these are piezo's:
http://www.warrengregoire.com/hifi-stereo-ikonoklast-tweeters.htm
speaker review here:
http://www.tnt-audio.com/casse/ikonoklast3_e.html
also these are piezo's:
http://www.warrengregoire.com/hifi-stereo-ikonoklast-tweeters.htm
speaker review here:
http://www.tnt-audio.com/casse/ikonoklast3_e.html
Piezos
Hi Carlos
Yes, that Mottorola, yes if I remember correctly it was a similar value
of capacitor, but again this has happened so long ago that it almost
vanished from my mind. Coisas da idade, you know!
To me the existency of such drivers (piezos, I believe:..) called
Ikonoklast was absolutely unknown, but the price range of such
devices made me turn myself off...But again there is a market for
everything (?) specially if they are ecommended by "The Stereophile"
(probably it wasn´t) that likes the axiom "the more expensive, the better"...
For this kind of money it better not have flaws, but it does, so what´s
the scoop?
Hi Carlos
Yes, that Mottorola, yes if I remember correctly it was a similar value
of capacitor, but again this has happened so long ago that it almost
vanished from my mind. Coisas da idade, you know!
To me the existency of such drivers (piezos, I believe:..) called
Ikonoklast was absolutely unknown, but the price range of such
devices made me turn myself off...But again there is a market for
everything (?) specially if they are ecommended by "The Stereophile"
(probably it wasn´t) that likes the axiom "the more expensive, the better"...
For this kind of money it better not have flaws, but it does, so what´s
the scoop?
Re: Piezos
Well, the initial schematic that I saw somewhere on the net had a higher value cap, don't remember what exactly...
These values I posted are exactly what I have, after listening tests and tuning.
Hell, I also don't remember how many years it was... 6...7?
Anyway, those Motorola drivers cost me at the time 25 Euros each. That I remember.
For this kind of money and the end result, there's anything that beats this.
Of course there is.
Exactly.
jmateus said:
Well, the initial schematic that I saw somewhere on the net had a higher value cap, don't remember what exactly...
These values I posted are exactly what I have, after listening tests and tuning.
Hell, I also don't remember how many years it was... 6...7?
Anyway, those Motorola drivers cost me at the time 25 Euros each. That I remember.
For this kind of money and the end result, there's anything that beats this.
jmateus said:
Of course there is.
jmateus said:
Exactly.
Piezos
That´s expensive man, but I understand, in Europe everything is expensive, and it was.... That I remember, I paid $4.95 for each
(when it comes to money, I remember,Ah,ah,ah), in this continent
these pieces go on being sold by "tuta e meia"... This might be the
reason why nobody touches them, apart from the sound of course...
Here and there cheap things are no good (?) only very expensive
stuff deserve the honors of being goooooood!
Ask Mr. "Stereophile"....
That´s expensive man, but I understand, in Europe everything is expensive, and it was.... That I remember, I paid $4.95 for each
(when it comes to money, I remember,Ah,ah,ah), in this continent
these pieces go on being sold by "tuta e meia"... This might be the
reason why nobody touches them, apart from the sound of course...
Here and there cheap things are no good (?) only very expensive
stuff deserve the honors of being goooooood!
Ask Mr. "Stereophile"....
piezo vs electromechanical tweeters
Hi all . I too use the Motorola horns for years and i like them . They are suitable for rock music for their power handling even if i am using an TT22 SE valve amp with no more than , say 15w .
An example of good performance provided is Tom Verlaine´s " Warm and Cool " album , high frequencies lightning alike .
Cheap devices that remind us that beauty exists beyond supermodel patterns .
Regards
TugaTw
Hi all . I too use the Motorola horns for years and i like them . They are suitable for rock music for their power handling even if i am using an TT22 SE valve amp with no more than , say 15w .
An example of good performance provided is Tom Verlaine´s " Warm and Cool " album , high frequencies lightning alike .
Cheap devices that remind us that beauty exists beyond supermodel patterns .
Regards
TugaTw
I match them with a pair of cheap fullranges.
And the amp is a cheap Harman-Kardon HK-620.
This is my forth system, it's on the basement. Not used very often.
Btw my tweeters are on independent rectangular little wood boxes.
With any speaker I have tried (including those cheap FRs) it transfigurates them completely to another level.
It's just a question of matching the crossover.
I've even tested them with my Epos speakers (instead of the Epos tweeters) and the results are very very good.
And the amp is a cheap Harman-Kardon HK-620.
This is my forth system, it's on the basement. Not used very often.
Btw my tweeters are on independent rectangular little wood boxes.
With any speaker I have tried (including those cheap FRs) it transfigurates them completely to another level.
It's just a question of matching the crossover.
I've even tested them with my Epos speakers (instead of the Epos tweeters) and the results are very very good.
Hey,
I,d join the club - if there was one, I,m currently using Monacor
4" wide dispersion horns in " my little speakers " see thread if interested. I recently read a posting from a Canadian guy who swears by using up to 5mh inductors with piezo,s to make them unrecognisable as piezos (smoother ?) I havn't got round to testing this method of xing them yet but I mean to ! I find these simple
extremely cheap devices fascinating.
I,d join the club - if there was one, I,m currently using Monacor
4" wide dispersion horns in " my little speakers " see thread if interested. I recently read a posting from a Canadian guy who swears by using up to 5mh inductors with piezo,s to make them unrecognisable as piezos (smoother ?) I havn't got round to testing this method of xing them yet but I mean to ! I find these simple
extremely cheap devices fascinating.
baggins said:
Hey, some Canadian guy here.
Yes, if you connect 2mH not 5mH as I earlier thought it has a most unusual affect. By the time you get to 5, it's cut off the high end too much but using a 2 has a pleasing effect to my ears. Unfortunately they still sound like piezo's but IMHO, better.
I still won't join the piezo club and haven't used one in a long time. They hurt my ears.
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