Hey guys. I've installed many subs, amps, speakers and head units but never a 4 channel Amp and to speakers at that. I plan to tune with my oscilloscope, but at what frequency? Also, do I set HPF, LPF, SUBSONIC, crossover in head units or on Amp, and to what setting? My front coaxial have a passive crossover. I'm going to be running my fronts coaxial unless there's a better way to do this on a 4 channel Amp with 4 speakers and two tweeters? Here's my speakers
https://powerbassusa.com/products/mobile-audio/2xl-63c-65-system/
https://powerbassusa.com/products/mobile-audio/2xl-693-6x9-full-range/