Whistling after installing new stereo (1 Viewer)

[wisemonkey]

I'm trying to figure out why does this occur and what can I do to avoid it.

Whistling after new stereo

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Do I simply install isolation on RCA cables? (like: https://www.amazon.com/Filter-Eliminator-Isolator-Quality-Theater/dp/B0C8158CGC)
Thanks

 

[sodafeld1]

Often a little condensor is attached to the alternator to minimise interference to the radio. I use a bluetooth speaker and my phone for tunes, so not an issue.

 

[sodafeld1]

does the whistle pitch coincide with revs?

 

[voodu3]

I think you need to ground the body of the head unit to the truck. I chased a similar issue when I installed an aftermarket radio in my daughter’s car. I ran a ground wire from the metal on the side of the head unit to the body and it went away.

 

[COS80]

Yep, bad ground.

 

[wisemonkey]

I think you need to ground the body of the head unit to the truck. I chased a similar issue when I installed an aftermarket radio in my daughter’s car. I ran a ground wire from the metal on the side of the head unit to the body and it went away.

I've done this though, basically I used the bracket which needs to be screwed in to head unit and added ground wire on that screw. Let me try grounding it at one more screw.

 

[wisemonkey]

Often a little condensor is attached to the alternator to minimise interference to the radio. I use a bluetooth speaker and my phone for tunes, so not an issue.

lol this is one way I guess.
Is there multi speaker system (I would like rear passengers to enjoy music as well)

 

[wisemonkey]

does the whistle pitch coincide with revs?

kind of, also when I turn on turn signal that kinda amplifies.

 

[sodafeld1]

well with the jbl xtreme it is pretty loud, but after maybe 10 yrs it has developed a buzz in the bass, even with a new battery. I take bass quite seriously for listening pleasure, music in general actually. I charge it from my inboard inverter 12v/240v/18v step down, which runs from the aux battery.

What I do like about it, I can remove my speaker from quick release velcro straps and take it to the party, camping, fire side, my workshop or other people's workshop/studio. Subject them to my music. I have researched it more since and would go for the jbl party box, too much volume but don't need to run at full volume so bass and watts are not maxed out, so no buzz. In the troopy I have lots of room for something larger. At present the xtreme is near my head overhead consul.

 

[wisemonkey]

Ok I grounded the stereo at 4 locations now, so unless I picked wrong ground location in car itself. Ground shouldn't be issue.

 

[wisemonkey]

does the whistle pitch coincide with revs?

What's needed for this? I confirmed it does.

 

[jbz]

Ground loop isolators sometimes fixes it. I assume you installed a 4 channel amp. Don't run your RCA signal cables along the same side as your power cable. Installing a subwoofer amp wont pick up interference since its lower frequency, but it definitely impacts an amp for your highs.

Bad pre-outs on your head unit could also cause that. You can take a hi low converter and hook it up to your head unit speaker outputs to test that. You lose some control over your system though.

 

[sodafeld1]

Oh gosh, years since I had to put one back on but if you google radio noise condenser you can get them pretty cheap on ebay. They use to be standard oem things attached to alternator. They are a capacitor.

 

[sodafeld1]

Ground loop isolators sometimes fixes it. I assume you installed a 4 channel amp. Don't run your RCA signal cables along the same side as your power cable. Installing a subwoofer amp wont pick up interference since its lower frequency, but it definitely impacts an amp for your highs.

Bad pre-outs on your head unit could also cause that. You can take a hi low converter and hook it up to your head unit speaker outputs to test that. You lose some control over your system though.

better voodoo explanation!

 

[Mjones]

Ok I grounded the stereo at 4 locations now, so unless I picked wrong ground location in car itself. Ground shouldn't be issue.

You really only need one ground. I'd start systematically removing a ground and seeing if there's one that's contributing more than another. And it can be a combination so try different combos.

Wire gauge can also play into it if it's too thin for length.

And like jbz mentioned - RCA cables running parallel with power can be a problem. Anything with power cable can translate into rev whine. If you do have a power cable make sure it's a homerun form battery to amp.

I haven't listened to this one but he has good tips abd builds.

 

[wisemonkey]

Ground loop isolators sometimes fixes it. I assume you installed a 4 channel amp. Don't run your RCA signal cables along the same side as your power cable. Installing a subwoofer amp wont pick up interference since its lower frequency, but it definitely impacts an amp for your highs.

Bad pre-outs on your head unit could also cause that. You can take a hi low converter and hook it up to your head unit speaker outputs to test that. You lose some control over your system though.

I'm using default amp, didn't change amp yet. Should I look at this? Or sub?

 

[wisemonkey]

You really only need one ground. I'd start systematically removing a ground and seeing if there's one that's contributing more than another. And it can be a combination so try different combos.

Wire gauge can also play into it if it's too thin for length.

And like jbz mentioned - RCA cables running parallel with power can be a problem. Anything with power cable can translate into rev whine. If you do have a power cable make sure it's a homerun form battery to amp.

I haven't listened to this one but he has good tips abd builds.

Going to try moving around RCA cables since they are accessible

 

[COS80]

Could be a pinched wire, too - an unintentional ground. More typical on signal wires. If it only makes noise at one speaker, it's probably that speaker's wires; if all over, then check the RCAs (or whatever feeds the amp).

 

[tmxmotorsports]

What kind of stereo equipment are you using.

 

[jbz]

I'm using default amp, didn't change amp yet. Should I look at this? Or sub?

Ah that changes everything. You might want to bypass it. So you’re running an aftermarket head unit with factory amp and speakers?