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I have hooked this unit up to my 2015 Mazda 3. I am a little confused as to how this works.
I already modified they speakers in my car to fit my new speakers and they work just fine. I want to install the AMP in my car and I already ran the wiring in the car.
My question is since the speakers already work and I have the PAC AOEM-MAZ2 installed do I still need to run new wire from the speakers " TO " the AMP in the back of the car " OR " do I just use the RCA cable that are plugged into the PAC AOEM-MAZ2 unit?
 

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From what I've gathered around here you just run the RCA since it takes the High level signal and make sit so the amp can see it as far as subs are concerned. For the regular speakers I think you would have to run RCA to amp and wire from the amp to each speaker because that's where the amplified signal is coming from, if you use stock it's just coming from the head unit like normal so no gain.

I'm no audio install expert but this makes sense to me but someone with experience should chime in.

Pretty sure this is what you're looking for. Looks like depending on how much power you might be able to do stock wiring with a little more work. Could be worth it.

https://www.crutchfield.com/S-RkEexBAeQ59/learn/connect-your-speakers-to-an-amp.html
 

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Without disconnecting the speakers from the factory harness and connecting your speakers to your amp the amp and PAC harness and your new amp are doing are doing absolutely nothing for you.

All the PAC is doing is giving a plug and play multi-channel line out converter.
 
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