i dont know how to connect them to the speaker because since they are factory high performance speakers, they have 4 wires that connect to the speaker. it has 2 positive and 2 negative. can you connect the bass blockers to the head unit wiring harness?
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Yes, you can connect it behind the head unit, IF the head unit is connected directly to the speakers. However, it's possible that your vehicle is equipped with a factory amplifier. That's common with premium OEM sound systems. In that case, the speaker wires behind the head unit will run to the amplifier, not the speakers. That would make your bass blockers effectively useless, because of the higher input impedance of the factory amp.
