The KSN 1038 tweeter acts like a 0.1uF capacitance in series with a 10 ohm resistance, and production runs do not vary from these figures by any significant amount. I try to emphasize this fact, because I find many who do not accurately describe the device. The tweeter will be attenuated 3dB by use of a 0.33uF capacitor in series.

There is quite a bit of information on the 1038/1041/1056 family of components available on this forum. You will find Motorola's original specification sheet and all the formula and methodology required to successfully implement these drivers in a suitable loudspeaker system.

There is no "guesswork," because we're working directly from the specification sheets. So I felt it might be helpful to redirect some of the readers of our recent piezo threads, to those earlier and perhaps overlooked. And thanks to Paul C for sharing experience with the larger piezo devices.