Subs and amp, need a little help

[Jopipe17]

Hey guys, in need of a little help.

So I have a 2020 Ram Rebel with the base non-nav 6 speaker system.

I'm adding a mono amp (Sundown SFB-2000D) and two 10 inch subwoofers(Sundown SA Classic 10"). All of the factory speakers are going to remain stock for now.

I went with the LC6i as my line-out converter and to future proof for when I add another amp and swap the factory speakers.

Since all speakers are running to the ANC and I need to bypass the ANC system anyway, I bought the PAC ANC-CH01.

I tapped into the rear door speakers at the harness and ran those to the LC6i. I ran the remote wire directly to an empty post on the fuse block under the hood. Power and ground to the LC6i are also being tapped from the ANC-CH01 harness.

I ran the remote wire (output) from the LC6i to my mono amp. Hooked up the amp accordingly; ran 0 awg to the battery with a 350 amp fuse. 0 awg ground wire.

The 2 door speakers that I tapped at the CH01 harness (RL-, RL+, RR-, RR+) are going to the LC6i's input side.

The subs are DVC 4 ohm. I have them wired series-parallel to remain 4 ohm. I plan to rewire to 1 ohm once I upgrade my battery and throw in a capacitor.

RCA's going from LC6i's output to the monoblock (not sure what the correct option is when only running subs).

Everything powers on. The rear door speakers that I tapped into work. Nothing from the subs. LC6i powers on. Amp powers on.

Tried different input positions on the LC6i (main, ch 2, ch 3) as well as different combinations on the output side.

Not sure if I'm missing something or if I'm overlooking jumper settings inside the LC6i or something.

I apologize for the long read, but as you can see I could use a little help.

Hey man I was curious, I'm installing a system in my 2020 ram 1500. I will be putting my Anc bypass harness in along with my wavetechDQ line out converter next to the ANC module. How long of rca cables you think I will need going from under my driver seat to my mono amp behind my back passenger seat? Was thinking maybe 9ft rcas but maybe 12ft to be on safe side. Thanks alot