No audio and loud buzzing coming from driver's side speakers after amp and dsp install

[MTHoe]

Hey Guys,
I just swapped in a amp and dsp into my 2019, and now i have this weird issue of getting buzzing/alternator noise from my driver side tweeter, and no sound. The door woofer has sound, but still has louder buzzing than the other speakers. I've checked the connections at both the factory radio, and the dsp and nothing was resolved. I used an LLJ customs harness and loopback harness to hook up both the dsp and the amp. The factory speakers have been upgraded

Pictured below is my grounding point. I sanded behind that plastic bracket, and then there is a washer on top of the ground wire so it's metal on metal for the ground.

Should I try a different ground point? This ground point is right next to the rear passenger seat near the door sills. Do yall think it could be the power wire coming through right next to the ground? i'd assume the plastic would insulate it ok but I could be wrong.

Could it be a bad connection where I spliced in the new dash speakers? I assume the noise is before since the input meter on my dsp shows little to no input from channel 1, but full healthy input from channel 2-4. Thanks in advance for the input yall!

 

[Joseph Garcia]

Swap the wires from the head unit output to the DSP's input, and see if the dead channel moves to the other side of the truck. If it does not, try swapping the wires from the DSP's output to the amp's input, and see if the dead channel moves to the other side of the truck. Once you isolate that, you may also find the source of your buzzing sound.

Also, in general, your high power 12V wire should be as far away from your low level input wires as possible. Installers often run the high power 12V power wire down one side of the truck and the low level input wires down the other side of the truck.

 

[MTHoe]

Just swapped channels 1 and 2, the buzzing switched to the other side.

I went into the radio and ungplugged the t-harness from the hmi, put the factory plug back in and there was zero buzzing. So i assume now my issue is the harness itself? Which seems weird considering it’s just a couple of pieces of wire?

I have the loopback harness ran down the right passenger side of the vehicle, and my power ran down the left side of the vehicle. Is it possible whatever factory harness is in the passenger side could be causing that kind of interference? Seems like it shouldn’t be. Anyways, I’m gonna try switching my ground point next to see if they helps.

 

[Tylerstc]

I would test your constant at the aftermarket harness and the ground coming out and if it’s low then maybe run a dedicated ground behind the head unit on that metal rail and see if that fixes it it’s probably grounding through your rca’s down to your amps ground because it’s a better path

 

[Fless]

I would test your constant at the aftermarket harness and the ground coming out and if it’s low then maybe run a dedicated ground behind the head unit on that metal rail and see if that fixes it it’s probably grounding through your rca’s down to your amps ground because it’s a better path

The OP hasn't been on here in 3 months, unfortunately.

 

[homesick]

The OP hasn't been on here in 3 months, unfortunately.

I guess I'll just hang on to my little slice of genius, then.

joe

 

[Fless]

I guess I'll just hang on to my little slice of genius, then.

joe

One never knows, your slice may help someone out.

 

[homesick]

One never knows, your slice may help someone out.

You're on the edge of your seat now, ain'tcha?

joe