Are the high pass capacitors for the front kick panel speakers really necessary?
I highly recommend using the high pass capacitors (aka – “bass blockers”) on the factory front kick panel speakers. My front kick panel speakers were popping with distortion at higher volumes, even though the 6×9’s sounded great, because the kick panel speakers are trying to reproduce the same low frequencies that the 6×9’s are now providing, but are not as capable for this task as the larger 6×9’s. The high pass capacitors eliminated the popping from the fronts by blocking those lower frequencies from going to the kick panel speakers.