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2017 212 ls speaker wire

Yes, you are doing fine. All of what @JDRacing said is exactly right, including the not being finished part...

I have a JL. I think I used a Y splitter like that until I found out the switch they have that lets you do that. It was covered very cryptically in my manual, so I will not be surprised if you pass over it and don't get it. The Y splitter won't hurt, but ultimately will not be needed. But since you have it, do it the easy way and use them. That will let you just do a simple 6 channel in (3 L/R pairs) and 6 channel out.
 
any tricks to running the wire I need to know about? I plan on getting one of those tools to fish the wire through
Yes, you are doing fine. All of what @JDRacing said is exactly right, including the not being finished part...

I have a JL. I think I used a Y splitter like that until I found out the switch they have that lets you do that. It was covered very cryptically in my manual, so I will not be surprised if you pass over it and don't get it. The Y splitter won't hurt, but ultimately will not be needed. But since you have it, do it the easy way and use them. That will let you just do a simple 6 channel in (3 L/R pairs) and 6 channel out.
I called JL, they have been great with customer service. Without me mentioning a Y splitter that’s what the employee told me to do. Here’s a picture of my manual.
 

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Just verified this today. Can’t believe I didn’t catch it before and I switched them to parallel now and wow what a difference. I didn’t choose to run entirely new wires since I have the stock Polk’s and just have an amp driving them. I only had to add addition ground runs from the in cabin rears back to the helm. I took the existing green(port) and purple(starboard) wires labeled “Series positive” and “Rear starboard positive” and spliced them together and connected them to the positive terminal on the rear cabins. The swim platforms you don’t need to touch since it has series positive on the positive and it’s own series negative running back. Then just attached the new ground runs to the neg of the rear cabins, run back to the amp and boom converted from series to parallel.
 
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