when you set both to flat you are not using the crossovers. It doesn't matter where you set the frequencies as it will all sound the same. your speakers are playing full range of frequencies.
try these combinations
front/rear 60/60
front/rear 60/80
or even front/rear 60/50
you will have less bass but the speakers will sound cleaner as they have less to deal with.
btw, what splits are they? 6in should easily handle being hp'd at 80 hz. I hp mine at 60hz, even at 50hz sometimes, but only when i'm listening at lower volumes. it lags a bit at higher volumes.



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