Tuning splits

[XB-16-AX]

I think I know what you guys mean by my head unit having a 5 band equalizer. Just did some research and my headunit comes with the following bands. Which ones do I adjust?

100Hz - 315Hz - 1.25kHz - 3.15kHz - 8kHz

100hz would be towards your Low freq

315-1.25hz are your Mid range

3.15-8hz are your High.

So put less of the Mid & High Freq ranges to eliminate those high pitches on your OP.