piezo/soft dome tweeter combination

e-side · 1st September 2005, 07:02 PM

Hello,

I am wondering if a piezo tweeter together with a soft dome tweeter will sound well. Does anybody know how it will sound? It's for home use.

regards

Salas · 2nd September 2005, 11:35 AM

You mean using the piezo as a super tweeter?

e-side · 2nd September 2005, 01:10 PM

yes, for about 8 khz and higher. Will it improve the sound quality of the system when a piezo is used this way? If so, how can i design a crossover for it?

regards

Salas · 2nd September 2005, 01:51 PM

They used to do it 20 years ago when the tweeters which had some power handling to speak of hardly had good dispersion.

If you think your system lacks HF, yes you can try out a piezo, its so cheap anyway.

Piezos have impedances in the hundreds of Ohm. You should run a resistor across it in the order of decades of Ohm. Then feed it with a .1 to .22 cap on the plus terminal.

3 things are your playground so to achive good integration.

a. The lesser the resistor the less the dB.

b. The smaller the cap, both less dB and higher cutoff.

c. Positive and negative polarity test to hear for best addition with your tweeter.

I would start with a 33 Ohm across, .22uf, and negative polarity on the piezo.

Good lack.

tade · 2nd September 2005, 02:09 PM

I completely agree with salas. Go for it. I stripped the piezo/cone element out of a horn piezo tweeter, and hung it via wire in front of my fullrange driver. Added a nice touch of air, though it was crossed over very high.

Cal Weldon · 2nd September 2005, 04:23 PM

The only reason I can condone this method is because it is cheap, like me. It would never cross my mind to use a piezo again. They are inexpensive for a reason. To me they are nothing more than a poor mans PA tweeter. If your other drivers are of quality then you might be wasting your time with a piezo. Perhaps consider another type of tweeter.

Cal

Salas · 2nd September 2005, 04:33 PM

Audax TW010F1 is up for grabs from Madisound. Good for a super tweet.

Cal Weldon · 2nd September 2005, 04:42 PM

That's a cute little weeter. A little low on the dB though. Is 90 enough?

e-side · 3rd September 2005, 05:54 PM

thanks for the replies!

Quote:

Originally posted by salas

If you think your system lacks HF, yes you can try out a piezo, its so cheap anyway.

The system has enough HF, but it's just an experiment. Maybe it 'adds' something to the sound, or makes the system sound nicer.

BTW, do piezos produce detailed sound?

regards

Cal Weldon · 3rd September 2005, 06:08 PM

To me, piezos give you an extremely detailed but unnatural sound.

Cal

1st September 2005, 07:02 PM	#1
e-side diyAudio Member Join Date: Jun 2005 Location: The Netherlands	piezo/soft dome tweeter combination Hello, I am wondering if a piezo tweeter together with a soft dome tweeter will sound well. Does anybody know how it will sound? It's for home use. regards

2nd September 2005, 04:23 PM	#6
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	The only reason I can condone this method is because it is cheap, like me. It would never cross my mind to use a piezo again. They are inexpensive for a reason. To me they are nothing more than a poor mans PA tweeter. If your other drivers are of quality then you might be wasting your time with a piezo. Perhaps consider another type of tweeter. Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

2nd September 2005, 04:42 PM	#8
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	That's a cute little weeter. A little low on the dB though. Is 90 enough? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

3rd September 2005, 06:08 PM	#10
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	To me, piezos give you an extremely detailed but unnatural sound. Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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2nd September 2005, 11:35 AM	#2
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	You mean using the piezo as a super tweeter?

2nd September 2005, 01:10 PM	#3
e-side diyAudio Member Join Date: Jun 2005 Location: The Netherlands	yes, for about 8 khz and higher. Will it improve the sound quality of the system when a piezo is used this way? If so, how can i design a crossover for it? regards

2nd September 2005, 01:51 PM	#4
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	They used to do it 20 years ago when the tweeters which had some power handling to speak of hardly had good dispersion. If you think your system lacks HF, yes you can try out a piezo, its so cheap anyway. Piezos have impedances in the hundreds of Ohm. You should run a resistor across it in the order of decades of Ohm. Then feed it with a .1 to .22 cap on the plus terminal. 3 things are your playground so to achive good integration. a. The lesser the resistor the less the dB. b. The smaller the cap, both less dB and higher cutoff. c. Positive and negative polarity test to hear for best addition with your tweeter. I would start with a 33 Ohm across, .22uf, and negative polarity on the piezo. Good lack.

2nd September 2005, 02:09 PM	#5
tade diyAudio Member Join Date: Feb 2005 Location: Ralieigh nc	I completely agree with salas. Go for it. I stripped the piezo/cone element out of a horn piezo tweeter, and hung it via wire in front of my fullrange driver. Added a nice touch of air, though it was crossed over very high.

2nd September 2005, 04:33 PM	#7
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Audax TW010F1 is up for grabs from Madisound. Good for a super tweet.

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