Walterjn Yeah I hear you. This will be my first attempt with separates. My new Kia has a tweeter in the pillar, so I thought about just replacing the tweeter & woofer without crossover. But based on other new Kia installs I have read about, the tweeter has a 8k high pass capacitor attached. Not sure that it would be wise to attach a new tweeter to a full range signal, so I am going to try the crossover.
Not sure why the HK/Infinity site has such low stock. Crutchfield has some
https://www.crutchfield.com/p_108K53XF/Infinity-Kappa-53XF.html?tp=97