I don't want to be too harsh, but you might want to factor that error into any confidence you have in anything this professional did or concluded. First day on the job?

I saw many many issues with his what he was doing and did not call him back to "finish the job". He wanted me to get a new LCM etc...

Alright so I got a second set of rca amazon basics cables. I was like, ok, I'm gonna connect these cables and the whine is gonna be there, so then I'll connect my old cables on one end, connect Jensen transformers in between, and connect amazon on the other end.

UNBELIEVABLY, the whine disappeared with only amazon cables!

I just disconnected old rca cables and connected Amazon cables running over the carpet of the vehicle.

Amazon Basics 2-Male to 2-Male RCA Audio Stereo Subwoofer Cable - 8 Feet https://a.co/d/glWWCzi

BOOM!

Whine is gone. Plugged back old cables, whine came back. Plugged amazon cables, no whine. Turned gains on the amp to MAX, no whine.

Holy moly, so much frustration, money and time and I'm 100% certain the issue is rca cables.

Now, I don't know if the issue is bad cables or interference. Now lots of people will rightfully think that I have mentioned that I tried another set of rca cables. And that's correct. The only problem, one set of rca cables I tried was twisted pair. I didn't fully know or understand this term, nor could I tell the difference by looking at them.

So that's why the previous test of substituting rca cables was invalid. I was using the wrong type of rca! I used rcas from this amp set

KnuKonceptz Bassik 0 Gauge Complete Amplifier Installation Amp Wiring Kit with RCA https://a.co/d/4Pd4Fnu

And they're twisted pair, no good!

The cables running under the carpet are Fospower

FosPower (7.6m / 25ft) 2 RCA M/M Stereo Audio Cable [24K Gold Plated | Copper Core] 2RCA Male to 2RCA Male [Left/Right] Premium Sound Quality Plug https://a.co/d/iGHF7Oh



Based on Amazon reviews, these cables seem fine, but who knows...



Just to avoid any further problems, I want to run new rca cables through the headliner!

I ordered longer cables, MonoPrice. Seems to be decent quality.

Monoprice 105348 15-Feet 22AWG Premium 2 RCA Plug to 2 RCA Plug Audio Cable, Black https://a.co/d/aRa3Fsl



15 feet should work for my idea

I drew a red line with how I plan to run them.

I haven't heard anyone running rca cables under the headliner, but why not??


https://i.ibb.co/4FNZPd1/20220707-143102.jpg