Hi all. Need some advice. I've spent numerous hours looking into changing speakers, fitting Focals with crossovers, Pioneer 4 ch amp, Rockford Fosgate behind seat sub and now I've discovered I'm wasting my time due to the head units internal equaliser settings. I have the professional hu and basic speaker set up. Is there any way around this or do I need to buy something like JL audio cleansweep to cure it?