You need to find the actual impedance graph for your tweeter driver and then look at the impedance at the frequency you are planning on driving it at. In spite of what you have stated, you WILL have a large current flowing at those higher frequencies and AC current CAN and WILL melt the thing. Square waves have strong ODD harmonics and so a 5KHz square wave will have strong harmonics at 15KHz and 25KHz and you could easily destroy the tweeter with a 50V square wave. Buy Electronic Spices Car Tweeter Piezo Electric Super High Frequency Speaker Pair For Audio speaker DOME Car Tweete Set of 2 Tweeter Car Speaker for Rs.400. You'll note that the impedance get very low above 20KHz so you need to be careful that you don't burn it out with your square wave.
#Piezo tweeter drivers
2 Goldwood Sound GT-1188 Piezo Bullet Tweeter or Midrange Drivers 400W each Replacement for KSN1188A. Here is an example from a Motorola piezo-tweeter driver: 2 Goldwood Sound GT-1165 Piezo Horn Tweeters 150 Watts each Replacement for KSN1165A. Click here for Jeff Bagbys Loudspeaker Design Software. The tweeter already behaves like there is a capacitor in series with it. So, as expected, you will have much more current flowing at higher frequencies than at lower ones. So, placing it in parallel with the woofer makes it a simple first order parallel crossover. They’re not great in terms of sound quality but do have some advantages: High efficiency means a higher decibel (dB) output (high sensitivity). They’re a type of paper cone tweeter driven by a piezoelectric driver instead of a magnet and voice coil. You can only measure the IMPEDANCE as a function of frequency and you will find that it resembles a capacitor much more so than a resistor. Piezo tweeters are somewhat of a lower-end type of tweeter. Piezo-tweeter drivers are funny things and they do not have any resistance that you can measure with an ohmmeter.
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