piezo passive crossover

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13 years 1 week ago #14276 by bitzo
piezo passive crossover was created by bitzo
Hi all,
I wonder how can be a passive crossover for a piezo cluster. Cut off will be around 3500hz

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13 years 1 week ago #14277 by bee
Replied by bee on topic piezo passive crossover
In general a Piezo tweeter needs NO crossover. It is self-crossovered by the nature of its design, and it does not alter the impedence of the overall speaker system. All you need is a network to limit high frequencies to the woofer. The Piezo tweeter is connected directly to the source, no crossover.

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13 years 1 week ago #14278 by bitzo
Replied by bitzo on topic piezo passive crossover
I tryed but it sound awful. Instead if I cross them on 3500hz sound better.

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13 years 1 week ago #14279 by bee
Replied by bee on topic piezo passive crossover
have you tried to put a resistor in line before it, so it wasn't so harsh......

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13 years 1 week ago #14280 by bee

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13 years 1 week ago #14294 by Xoc1
Replied by Xoc1 on topic piezo passive crossover

bee wrote: found some info hear that may be of help.....

www.planet10-hifi.com/piezo-XO.html

smiley20
Adding a proper crossover will increase the power handling as well.
To calculate the component values you need you could use a first order crossover calculator like the one supplied with WinISDpro. Instead of entering the driver impedance you just enter the resistor value instead.
So for 3.5kHz you need a 2uF cap with a 22R resistor.

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13 years 6 days ago #14298 by bitzo
Replied by bitzo on topic piezo passive crossover
so interesting but this calc is just for one unit...
If wire all the piezos in parallel I have to add just one 22 ohm resistance? and if so how many watt should take this resistance?

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13 years 6 days ago #14325 by Xoc1
Replied by Xoc1 on topic piezo passive crossover

bitzo wrote: so interesting but this calc is just for one unit...
If wire all the piezos in parallel I have to add just one 22 ohm resistance? and if so how many watt should take this resistance?

There is some more information on Piezo drivers here

www.pulsardevelopments.com/produ ... #crossover

In particular there is a graph showing the Impedance of a Piezo Driver at different frequencies, and also another showing the loss in efficiency if you use a 6 ohm or 10 ohm resistor.
I guess that your Piezo Drivers would be at least 125 ohms each at 3.5Khz so it depends what drivers you have and how many :?:
Only one resistor needed in parallel - The power rating depends on how much power you are going to use.
If you had a dymamic 50w 8R HF driver equivalent, the 22 ohm load would be 18w.

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