How can I eliminate the buzzing/hissing noise with an aftermarket radio in my XG350? - Hyundai Forums : Hyundai Forum
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post #1 of 46 (permalink) Old 08-01-2016, 10:05 PM Thread Starter
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How can I eliminate the buzzing/hissing noise with an aftermarket radio in my XG350?

I have a 2005 XG350 that has the infinity audio system, so there is a factory amp in the car. I installed an aftermarket radio using the Metra 70-7301 Wire Harness. It functions fine but there is a lot buzzing/hissing noise in the system. How can I get rid of it?

From searching Google, it seems that the noise is caused by the factory amp and aftermarket radio combination. The noise doesn't increase when revving the engine. When I was getting the parts for the aftermarket radio, Crutchfield had recommended getting a Scosche SLC4 so I bought one but that only add more noise to the system.
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post #2 of 46 (permalink) Old 08-01-2016, 11:03 PM
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I have a 2005 XG350 that has the infinity audio system, so there is a factory amp in the car. I installed an aftermarket radio using the Metra 70-7301 Wire Harness. It functions fine but there is a lot buzzing/hissing noise in the system. How can I get rid of it?

From searching Google, it seems that the noise is caused by the factory amp and aftermarket radio combination. The noise doesn't increase when revving the engine. When I was getting the parts for the aftermarket radio, Crutchfield had recommended getting a Scosche SLC4 so I bought one but that only add more noise to the system.

Get some heavy wire, 12ga or better, tie a length to each component, find a TRUE ground or run a length of wire direct to the battery, and tie all components to the same ground.

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post #3 of 46 (permalink) Old 08-01-2016, 11:43 PM
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Is it a floating ground?
Or is it tied to battery ground?
As Old's Cool said, it is probably a ground problem.

If it is caused by component mis-match there is much can be done besides get a new radio or amp.
If the radio has a noisy output and the factory amp is just making the noise louder
Some filtering helps but never quite seems to get rid of the noise.

Good luck
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post #4 of 46 (permalink) Old 08-02-2016, 03:27 AM Thread Starter
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Get some heavy wire, 12ga or better, tie a length to each component, find a TRUE ground or run a length of wire direct to the battery, and tie all components to the same ground.
Okay so you're saying to connect all the ground wires on the harness/radio (right/left front/rear speaker grounds and head unit ground) to some 12 awg wire and connect that wire to a true ground? What is/can be used a true ground besides the car's battery?

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Is it a floating ground?
Or is it tied to battery ground?
As Old's Cool said, it is probably a ground problem.

If it is caused by component mis-match there is much can be done besides get a new radio or amp.
If the radio has a noisy output and the factory amp is just making the noise louder
Some filtering helps but never quite seems to get rid of the noise.

Good luck
I've only connected the wire harness adapter to the aftermarket's ISO connector. I have no idea what the wire harness' ground is connected to. I would rather avoid having to run a cable from the car battery the head unit. Would some metal inside the head unit's dash work as well?

Last edited by Spartoi; 08-02-2016 at 03:29 AM.
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post #5 of 46 (permalink) Old 08-02-2016, 08:10 AM
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Okay so you're saying to connect all the ground wires on the harness/radio (right/left front/rear speaker grounds and head unit ground) to some 12 awg wire and connect that wire to a true ground? What is/can be used a true ground besides the car's battery?



I've only connected the wire harness adapter to the aftermarket's ISO connector. I have no idea what the wire harness' ground is connected to. I would rather avoid having to run a cable from the car battery the head unit. Would some metal inside the head unit's dash work as well?
Don't ground the speakers. They need to be tied to the amp's ground.

If there are ground wires on the power connectors, tie those all together and then tie them to a GOOD ground. You can try grounding everything together, and then tying those to a good ground. Problem is, grounds on Hyundais are bad. The main cable ground is tied to a painted surface; that's why I suggested tying it to the battery.

If tying all the grounds together doesn't work, then tie the chassis of all the components together to the same ground as the (-) wires as well. It also won't hurt to remove the battery, chase the main ground cable down, remove the paint, reattach the cable and coat it with grease or dielectric grease.

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post #6 of 46 (permalink) Old 08-02-2016, 08:33 AM
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2002-2005 Hyundai XG350 Wiring Information

Not sure of the exact vehicle configuration - but it might be easier to just add some good aftermarket component door speakers and coax rear speakers and bypass the factory amps.


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post #7 of 46 (permalink) Old 08-02-2016, 02:15 PM Thread Starter
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Don't ground the speakers. They need to be tied to the amp's ground.

If there are ground wires on the power connectors, tie those all together and then tie them to a GOOD ground. You can try grounding everything together, and then tying those to a good ground. Problem is, grounds on Hyundais are bad. The main cable ground is tied to a painted surface; that's why I suggested tying it to the battery.

If tying all the grounds together doesn't work, then tie the chassis of all the components together to the same ground as the (-) wires as well. It also won't hurt to remove the battery, chase the main ground cable down, remove the paint, reattach the cable and coat it with grease or dielectric grease.
The speaker's ground wires need to be tied to the factory amp's ground? From what I've read online, the XG350 has 4 individual amps for each speaker, so would I have to match each speaker ground wire to their respective amp ground? I'd rather avoid doing this if possible. Could I just connect all of the speaker's ground wires to one of the amp's ground rather than each respective (4) amp's ground?

There is only one black ground cable for power on the harness/ISO connector. You're saying to tie that a good ground/the car battery?

Could you tell me why I have to do so much to get the aftermarket radio working when the OEM head unit is just plug-and-play with no buzzing sound?

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2002-2005 Hyundai XG350 Wiring Information

Not sure of the exact vehicle configuration - but it might be easier to just add some good aftermarket component door speakers and coax rear speakers and bypass the factory amps.
Trying to avoid this. I don't want to buy new speakers.

Last edited by Spartoi; 08-02-2016 at 02:27 PM.
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post #8 of 46 (permalink) Old 08-02-2016, 02:28 PM
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I didn't say they had to be great speakers - looks like the fronts are 6.5/6.75 components and the rears are 6x9's - you could replace all 4 for under $100 - maybe well under that ...

You mis-understood Old's cool's post - the speakers have to be grounded to the amp internally to the amp - you don't want to touch the negative speaker leads (they aren't speaker grounds).

Essentially, the OEM amp(s) are matched to the output and grounding points of the OEM radio and the aftermarket radio doesn't match these.


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post #9 of 46 (permalink) Old 08-02-2016, 02:45 PM
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Ideas -
Autotek ATS65C 300W 6-1/2" 2-Way ATS Series Component Car Speaker
Autotek ATS693 300W 6 x 9" 3-Way ATS Series Coaxial Car Speakers

$55

These aren't great, but they're a lot better than what you have now:





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post #10 of 46 (permalink) Old 08-02-2016, 03:12 PM Thread Starter
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I didn't say they had to be great speakers - looks like the fronts are 6.5/6.75 components and the rears are 6x9's - you could replace all 4 for under $100 - maybe well under that ...

You mis-understood Old's cool's post - the speakers have to be grounded to the amp internally to the amp - you don't want to touch the negative speaker leads (they aren't speaker grounds).

Essentially, the OEM amp(s) are matched to the output and grounding points of the OEM radio and the aftermarket radio doesn't match these.
Are you saying that the factory amp has to be opened up to find a ground connection?

If I were to replace the speakers, I'd buy through Amazon (cheaper and faster shipping). Could you link me to some speakers that are better than what I have now but sold on Amazon (the first speaker you linked is out of stock).
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