Alternator/Speaker Whine

[Fabian12]

I apologize if there is already an open thread on this topic, but I am having no luck.

System: Js 330a alternator, taramps 8000.1 (being ran at 2ohm so roughly 5k rms), Rockford Fosgate R2-500x4, PRVA 2.4x DSP, 3 Napa Legend AGM 100ah batteries, dual Sundown X12v3s, Kenwood Excelon Double Din, 4 DS18 6.5s.

Vehicle: 2008 Honda Civic 1.8L

Big 3 and all power and grounds are 2/0 welding cable with common ground to chassis

Issue: I recently developed a severe speaker whine when accelerating. The issue is also present at idle, and gets louder with the volume knob. Issue is not present when just ignition is on, only when the engine is running. Ive assumed its a ground loop related to the alternator, but dont have much experience troubleshooting this type of issue.

I've checked all my grounds, and all are tight, on bare metal, and bolted to vehicle chassis, 1 battery is under the hood (Grounded to chassis). and my other 2 are in the rear grounded to a very thick bolt separating my trunk and rear seats. Both of my amps and dsp are grounded to one of the batteries in the rear. I have also tried a new dsp and the issue persisted.

RCAs are ran separately from the main power wire, and I have tried multiple sets of high quality rcas. Does anyone have any testing/troubleshooting insight on how to figure out exactly where this issue lies and how to fix it?

Edit: and I have changed nothing on this build in the last 6 months, and the problem has just randomly started occurring, and has gotten slightly worse over the last week or 2

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[CarAudio.com - Hal AI Bots]

I apologize if there is already an open thread on this topic, but I am having no luck.

System: Js 330a alternator, taramps 8000.1 (being ran at 2ohm so roughly 5k rms), Rockford Fosgate R2-500x4, PRVA 2.4x DSP, 3 Napa Legend AGM 100ah batteries, dual Sundown X12v3s, Kenwood Excelon Double Din, 4 DS18 6.5s.

Vehicle: 2008 Honda Civic 1.8L

Big 3 and all power and grounds are 2/0 welding cable with common ground to chassis

Issue: I recently developed a severe speaker whine when accelerating. The issue is also present at idle, and gets louder with the volume knob. Issue is not present when just ignition is on, only when the engine is running. Ive assumed its a ground loop related to the alternator, but dont have much experience troubleshooting this type of issue.

I've checked all my grounds, and all are tight, on bare metal, and bolted to vehicle chassis, 1 battery is under the hood (Grounded to chassis). and my other 2 are in the rear grounded to a very thick bolt separating my trunk and rear seats. Both of my amps and dsp are grounded to one of the batteries in the rear. I have also tried a new dsp and the issue persisted.

RCAs are ran separately from the main power wire, and I have tried multiple sets of high quality rcas. Does anyone have any testing/troubleshooting insight on how to figure out exactly where this issue lies and how to fix it?

Edit: and I have changed nothing on this build in the last 6 months, and the problem has just randomly started occurring, and has gotten slightly worse over the last week or 2

It sounds like you're experiencing a common issue. Often, speaker whine can be caused by ground loop problems or alternator noise. I recommend checking your ground points for any corrosion, ensuring they have a solid connection. Also, consider using a ground loop isolator or checking the routing of your RCAs and power cables again. If the issue persists, you may want to try a different alternator or check your power management settings.

 

[mahc 10+ year member]

Are your amps all grounded at the same spot?

 

[Fabian12]

Are your amps all grounded at the same spot?

Yes, they're grounded to one of the rear battery negative posts going straight to a very solid ground. Which is a 12inch 2/0 run from battery ground to chassis

 

[Jimi77 Premium Member]

Try substituting an phone for the HU and see if the whine goes away. If that makes the whine go away, try grounding the HU to the same spot as the amps.

 

[SbassLaser]

I'd be looking at the grounding of the headunit if all your amps look good.

 

[mahc 10+ year member]

Doing this may help.

 

[RobGMN Premium Member]

If it just started suddenly and you can't locate any grounding issues, you may want to have that alternator checked out. You could have a failing diode or leaking diode.

 

[Fabian12]

Try substituting an phone for the HU and see if the whine goes away. If that makes the whine go away, try grounding the HU to the same spot as the amps.

Ive already grounded the HU with the amps in the rear with a temp wire. I spoke with the company I got my HO alt from and they believe its a rectifier issue in the alternator. So im likely going to ship that off tmr and see if thats the issue.

 

[Jimi77 Premium Member]

Ive already grounded the HU with the amps in the rear with a temp wire. I spoke with the company I got my HO alt from and they believe its a rectifier issue in the alternator. So im likely going to ship that off tmr and see if thats the issue.

Good luck.