I have a basic system in my 2019 Corolla and I am keeping the factory head unit. I replaced the front speakers with a component set (transplanted from my previous car) that sounds very good to me. I am going to replace the rear factory speakers with a pair of 6x9 's (that happen to be 3-way) so that I can get a little more/better bass. I mostly listen with the fader favoring the front speakers. My questions are if I don't want to hear mids and highs from the rear, can I simply disconnect the exposed 2 conductor wire that goes to the coaxial mounted mid-and tweeter? If I do this would it change the overall impedance of the speaker to the point where it could damage the head unit?
Or, is there a better way to do this such as by putting a coil in line with the 6x9 speaker to act as a low pass filter. If so, what value coil should I use (mH) and where might I be able to get one. Thanks in advance for any help.