New Audio System, Quality Issue

[dcmdon]

Thats my understanding. Don't quote me, I could be wrong - but that's the whole reason that the amppro is needed. Canbus/uconnect doesn't provide a flat usable signal.

Interesting. And I guess this is preferable from a sound quality perspective than taking high gain analog output from the factory amp and running that into high gain inputs on the new amp. (if it has them)

So the factory amp must have a canbus connection.

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[DatacomGuy]

Reinstalled the ground to a factory ground. Problem still exists. Grr

 

[DatacomGuy]

Its not the speakers.

They wouldn't all fail at once. So if the noise is coming from more than one, then its something besides the speakers.

How is your amp grounded? Have you tried driving your amp with something like a phone with headphone to RCA cable?

This could be a good troubleshooting step since it removes the entire factory head unit from the picture. If the noise is still there, its the amp. If its gone, then its something upstream from the amp.

https://smile.amazon.com/UGREEN-Auxiliary-Splitter-Compatible-Smartphone/dp/B088GR2Z2G

so this is interesting. I did the headphone to RCA input in to channels 1 and 2 and got no output from the speakers. I tried in the sub input and got sound. Any thoughts why I wouldn't hear a single thing out of the other two channels?

 

[dcmdon]

so this is interesting. I did the headphone to RCA input in to channels 1 and 2 and got no output from the speakers. I tried in the sub input and got sound. Any thoughts why I wouldn't hear a single thing out of the other two channels?

Hmm. Maybe the gain on the headphone jack isn't enough?

Do you have a home stereo component with RCA-out jacks? Maybe try running that into the amp?

Do you have another amp to try in the same place. Its about using logic and swapping stuff out if you don't have the right test equipment.

 

[DatacomGuy]

Hmm. Maybe the gain on the headphone jack isn't enough?

Do you have a home stereo component with RCA-out jacks? Maybe try running that into the amp?

Do you have another amp to try in the same place. Its about using logic and swapping stuff out if you don't have the right test equipment.

I'll search around to see what I can find around here.

I spoke to PAC and they think it might be a bad unit. I've ordered another to test with but won't be here for a week or so.

Unfortunately I don't have another amp. I'll see if I can find something local to test with.

 

[DatacomGuy]

Quick update. PAC recommended that i replace the amppro and that it might be defective. Did that today and same result. so its either source or the amp.

 

[sass JT]

Sounds like a possible source issue. Here’s something to try. Do you know anyone that can run an rca output source unit to your amp that is known to be clean? If you do, run that rca over and check. If you have issues then it’s the amp, if not then there’s something going on with the pac unit.
There is the possibility that you need to take it to a car audio shop to have it checked out?

 

[DatacomGuy]

another interesting observation. When I fade to the front through the head unit, no sound comes out. If I fade/balance to the rear, rear works fine. If I keep fade and balance center, audio in the front (and rear) is fine.

 

[Beemer533]

Reinstalled the ground to a factory ground. Problem still exists. Grr

It may or may not make a difference in your case, but the best way to solve a ground loop is to have all the components connected to the same ground point. Even if they are all using factory ground points, there could still be a difference in potential which is what causes the ground loop noise you hear.

All that being said, based on your last couple of posts it does not sounds like that is your issue.

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