Low fluctuating hum?

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Mar 25, 2021 | 02:30 PM

#21

wilburbill

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Joined: Sep 2012

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From: Mo

I had a hum issue after installing my new head unit and amps. Turned out to be a ground issue. I tied all grounds from head unit, amps, and DSP all together and that fixed it.

Mar 25, 2021 | 03:01 PM

#22

hamah

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Joined: Feb 2016

Posts: 1,354

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From: Vancouver, BC

Quote:

Originally Posted by wilburbill

I had a hum issue after installing my new head unit and amps. Turned out to be a ground issue. I tied all grounds from head unit, amps, and DSP all together and that fixed it.

That makes sense. The #1 cause of noise in grounds is probably due to voltage differentials between the various components. Tying the grounds together (ensuring you're using the same ground) eliminates that. This is also why a crappy RCA interconnect often proves to be the issue. It also ties the chassis grounds together. To eliminate engine noise the manufacturer of the amp the OP on this thread uses recommends common grounding on pg 3 of this manual (in this case the noise is present with the motor off though).

Last edited by hamah; Mar 25, 2021 at 03:36 PM.

Mar 25, 2021 | 03:23 PM

#23

SBates08

Seasoned HDF Member

Joined: Jan 2013

Posts: 10,637

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From: Lake, Ms

Quote:

Originally Posted by wilburbill

I had a hum issue after installing my new head unit and amps. Turned out to be a ground issue. I tied all grounds from head unit, amps, and DSP all together and that fixed it.

Just for shitz n giggles, where was the common ground that you used for all of those components?

Mar 25, 2021 | 03:37 PM

#24

travelingypsye

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Joined: Dec 2017

Posts: 3,368

Likes: 689

From: indiana

Quote:

Originally Posted by SBates08

Just for shitz n giggles, where was the common ground that you used for all of those components?

Mar 25, 2021 | 03:39 PM

#25

cshocker

Stellar HDF Member

Joined: Jul 2016

Posts: 2,210

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From: Andover, MN

You boys go ahead and discuss all this technical humming. I'm going to figure out what all that humming noise is coming from my gf's bedroom.......

Mar 25, 2021 | 03:49 PM

#26

teedoff65

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Joined: Jul 2017

Posts: 5,749

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From: High Point, NC.

Quote:

Originally Posted by cshocker

You boys go ahead and discuss all this technical humming. I'm going to figure out what all that humming noise is coming from my gf's bedroom.......

well obviously you're not in there so it must be a hum of boredom. Lol

Maybe she needs to be ground properly.

Mar 25, 2021 | 03:54 PM

#27

mrmagloo

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Joined: Aug 2005

Posts: 510

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I had a ground issue on that new fangled toilet sprayer thingie my wife wanted. I heard screaming one morning and came running in. The thing went into hyperdrive or something and she had bidet water squirting out her ears.

Still searching for that ground strap.

Mar 26, 2021 | 07:33 AM

#28

wilburbill

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Joined: Sep 2012

Posts: 625

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From: Mo

Quote:

Originally Posted by SBates08

Just for shitz n giggles, where was the common ground that you used for all of those components?

I kept the ground from the amp at the battery but ran an extra ground wire from the radio and DSP to the ground connection at the back of the amp thus tying all grounds together.