I recommend powering and/or grounding your LOC using the same power and ground for the amplifier. While you can tap off these pins at the amplifier, make sure you have good noise isolation with the equipment you're using otherwise it's very likely you'll introduce some unwanted alternator noise coming from the tweeters. Now the audiophile facepalm here is the tweeters are also driven from these channels, which means there's a crossover network somewhere in the doors most likely. I can confirm these do contain the low frequencies. If you plan on adding a sub after the amplifier, you'll need to tap into the front door speakers as shown at the top of the diagram (pins 3C, 3D & 3E, 3F from connector.Also, I've verified a lot of the outputs myself so I know this diagram is accurate. If anyone wants the non-marked up images feel free to let me know. He was sending me pictures from his phone so some were a bit cutoff and therefor I compiled the data below which is a little easier to read. The original documents were graciously provided to me by a very helpful person on reddit. There is a connector behind the Tablet/HU, (works for 2012 M3 non Bose and 2014 M6 GT with Bose for sure because I've done it) The PAC ADD-MAZ2 harness/OEM-1/LOC (hence forth will be referred to as "MAZ2" that we have used in the past year models will not work on this car. I've emailed PAC but have not received a return email and it's been 5 days. The goal for me is to add a sensible sub to the car without cutting or splicing into the factory wiring but with the MAZ2 not fitting this car I'm thinking that I'll have to splice into it. This is related to the 2018 6 GT and above with the Bose system but is not limited to only the Bose. Hopefully we can learn from each other and also save some folks from wasted time and effort. This thread starter is more of a discovery post. You can always stop and ask for help or take it to a car audio professional but you can't un-break things as easily. I have experience with car audio so please do not do anything that your'e not comfortable with. Please feel free to add anything that will help contribute to the effort. This thread is dedicated to adding a subwoofer to your 2018 Mazda 6.
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