Then use the factory wiring to connect new speakers in the factory locations, and run a new wire to the aftermarket subwoofer installed in the trunk. You can also use the 18-pin connector at the factory amplifier to feed those wires to the aftermarket amplifier speaker outputs. This is the harness you can use to splice the speaker and subwoofer wires to RCA plugs to feed directly into an aftermarket amp, including the remote turn-on lead.
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This type of stereo upgrade is even easier by utilizing the 24-pin connector at the factory amplifier because it has the pre-amp level speaker outputs, subwoofer pre-amp level output, and amplifier remote turn-on lead from the Premium Audio head unit all in one harness. JL Audio and Infinity make amps that accept differential balanced inputs.
You do need an amplifier that is compatible with differential balanced outputs. You can do this for the front, rear, and subwoofer outputs from the Premium Audio System head unit (Navigation and Non-Navigation). All you need to do is splice the factory speaker output wiring and convert them to RCA plugs to feed directly into an aftermarket amplifier. Since the head unit is unpowered, you do not need a line out converter. Most posts I read about stereo upgrades recommended a line out converter, even on the premium audio system, but an LOC is not necessary with the premium audio system. The best part of the premium system is the head unit, because it is unpowered with pre-amp level outputs for the front, rear, and subwoofer. The solution is to remove the factory amplifier, speakers, and the subwoofer.
If you replace the speakers and keep the factory amplifier, you still get poor sound because of the internal crossovers in the amplifier. The amplifier is flawed because it has the frequency crossovers built-in for the front tweeters, rear speakers, and subwoofer. The premium audio system is pretty awful. The "Premium Audio System" featured the external 360-watt amplifier with 7 speaker system, including a subwoofer.
Here is information to help anyone who is thinking about upgrading the "Premium Audio System" Navigation (and Non-Navigation) stereo in their Civic EX & EX-L Coupe and Si Sedan/Coupe.
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