I have the Polk Audio db5250 speakers installed in the front of my 2004 F150 supercrew and I'm running them off a JLB GTO755.6 II (60W rms X 4 + 107W rms X 2) Amp. I'm not currently using the amps crossover just my headunits. Which is a Pioneer DEH-P7800MP. I can't seem to find a good High Pass frequency for these speakers. For example I play country and it sounds fine set at 125hz I play techno and I have to adjust the cut off higher.
Anyways if I was pumping full power and full range audio to these speakers what would be the best high pass cut off frequency for these 5.25" components?