What is wrong with my subwoofer setup?!?

Alright. This has been bugging me for a long time. Please help me. Please

I Will be very specific on everything I have done to try to fix this. As of now, the amp is turned on, but no sound is coming from subwoofer.

I moved my amp from a spot behind the seat to the trunk. In doing this, I needed to extend some cables. The remote wire and rca cable. I bought female to male rca cables and more remote wire.

I got everything mounted, turned it on, and it didn t work. No sound from subs. The power light was on and the amp was not in protective mode.

So, I bought a new amp, to diagnose a broken amp.

I bought a new head unit that is the same model as mine, to diagnose a blow rca jack in the back.

I bought a new remote wire, wired it in and no dice.

I bought a new rca wire, wired it in no dice.

My ground is stable.

My power is flowing.

My fuses are not blown.

I tried perfectly working speakers and new speaker wire, no dice.

I don t know if I forgot anything. But the jist of it is, I ve replaced just about everything in my system, and it hasn t worked. The only thing I haven t done is mess with the wiring in the back of the head unit aside from the rcas. But that is because the wiring isn t the issue as it was working perfectly before when untouched.

Right now, I have a new amp fuse shipping to me for my power wire, so I m gonna replace that.

Does anyone have any suggestions?

-kenwood kac-5001sp

-alpine cde-w235bt

-4 gauge wiring

-18 gauge remote wiring