Adding sub/amp to 2015 tundra (non JBL)

So I'm planning to leave the factory head unit and the small factory "amp" that drives the door speakers all in place.

I plan to add 2 10" subs and an amp. To do so won't I need a line out converter like this

$17 Scosche LOC2SL Line Output Converter with Remote Control Knob - 2CH High/Low RCA Converter Car Audio - Ideal for Subwoofer Amp - Line Level Converter for Car Stereo - Easy Installation - Quality Sound

https://www.amazon.com/SCOSCHE-LOC2...5&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY

then tap into the factory speaker wire with the line out converter, then take that to the amp, and then sub?

I realize I'll have to run power/ground to the amp. Also how do you wire up the remote wire for the amp? Do you use an add a circuit fuse line?

 

Yes, essentially you have it all correct. A L.O.C. is the easiest and cheapest way to get signal to your sub amp. Be sure to make sure whatever speakers you tap in to (it isn't absolutely necessary, but always recommended to use L&R speaker input even though it will be going to a mono amplifier) are full range and aren't crossed over above the bass and sub-bass frequencies you want to hear with your subs.

As for the remote wire, many L.O.C.'s today have the ability to generate an amp turn-on signal when they sense audio signal on their input circuit. You will need to wire it to power and ground as well, but it will give you a reliable turn on signal without needing to find Ignition or Accessory power circuits.

I am personally unfamiliar with your truck, but you will also want to research if there is any Active Noise Cancellation in your particular trim and where the microphone for it is (or how to bypass it other ways via Carista or other apps). ANC can cause very strange feedback problems and also phasing problems as your audio system will try and compensate for the added bass that it would see as road noise.