Bs. Crossovers are designed only to separate out the tweeter and midrange/midbass signals. You should never pass subwoofer signals to your main speakers and you should not pass frequencies above that range to your subwoofer. Doing so causes distortion and a general lack of fidelity.Your speakers need crossovers. It's not the job if the head unit to route the appropriate audio signals to each speaker. The OEM amp had built in crossovers.
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