I dont have any response curve of the tweeter, but I used a 900Hz filter I had around with a L-pad, just to test how it sounded and I think i will need top octave compensation. I think a crossover freq. of about 1.6-2kHz should be fine for this driver. I have never designed a crossover before and would be very grateful if you had som drawings of a crossover to use with this driver. The impedance of the driver is 8 ohm