Base Stereo Upgrade. (I've searched)

[OrangeFuryS550]

Hey everyone!

I'm in the middle of upgrading my stereo, and it's been a pain in the A$$. The previous owner for my vehicle just threw stuff together and then removed the aftermarket stereo and cut wires and it's a damn mess. Here is what I've done so far:
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- Head Unit - Linkswell Gen4 "T Style" Screen.
Tesla Screen
- Front door speakers and tweeters - DS18 EXL-SQL6.5CX
6.5 Speakers
- Subwoofer - DS18 ZR12.4D
12" Subwoofer
- Amplifier - DS18 EXL-P1200x4 4-Channel Amp
4-Channel Amp
- Amp Kit - DS18 4 gauge Amp Kit
4 gauge Amp Kit
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I would rather not run a DSP as the headunit has a processor built it.

I have questions about the crossovers for the tweeter and front door speakers. When I removed the old kicker components I noticed the crossovers were wired to 2 wires going up the A Piller and along the roof. Does anyone know where these go to? The rear? I plugged the tweeters into the crossover, but I noticed on the old crossovers there were 2 wires that were bundled up and plugged into the "woofer" port on the crossover, but they weren't hooked up to anything else. The part that is confusing me is 1. Where are the "input" wires coming from? 2. If the door speakers are plugged in from the harness where are they going to? I have signal.

When purchasing the equipment - the 5 channel amp I wanted is out of stock, so they told me I can use a 4 channel amp. I can run Channels 1 and 2 for the front LR components and with the sub being a dual voice coil I can run each coil to channel 3 and 4.

I need help with what wires to use. Can someone please help me out here? I've had my car torn apart for 3 days trying to figure this out and not getting anywhere. Everything I've read on here has a ton of information - but it's not pin pointed to what I need - and I'm running out of patience.

I understand the remote/ground/power wire. I'm having trouble figuring out the speaker wires in the harness. Which ones do I tap into and do I run that tap to the +/- terminals on the amp channels?

When I was installing the head unit - I noticed the person has soldered RCA cables to some wires on the harnes. The head unit has RCA outputs. Can't I just run the LR RCA to the AMP?

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[Inthehighdesert]

What you need to do first is start from scratch. Take it back to the factory wiring and work your way out from there. Don’t take this wrong but it seems like your lacking some basic low voltage knowledge. There’s some very basic technics for toning out speakers that will help you figure out what goes where and if the polarity is correct, this is referring to your speaker wiring. I get the frustration, but some times you have to slow down, step back, take a breath, then move forward.