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Old 10-31-2013, 07:49 AM   #1
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Need some audio help ... PLEASE!

Ok so I installed a new head unit speakers and a amp this weekend. Out if the speakers I'm getting this high pitched buzzing noise 😩.... When I hit the mute button on the head unit the noise stops.... I checked the ground on the head unit and it still does it. When I turn the music up you can hear the noise less I guess since obv there is now music playing out if it..... So this leads me to think its something with my amp.... So I tried to turn the gains down and the volume of the noise decreases..... So my question is HOW DO I GET RID OF THIS IRRITATING NOISE?!?!?!? PLEASE HELP ME!!!!


Let me add this I have read that this issue can be caused by grounding.. I grounded the amp to the rear seatbelt bolt in my jeep wrangler.... I cleaned of the paint in the body and on BOTTOM(didn't sand the top) of the seat belt bracket.

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Old 10-31-2013, 08:16 AM   #2
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Just a wild guess here as it's been a while.

Check where your RCA cable is running. I seem to recall that it can pick up sound if its close to your power cable or some other electronics.

I could be totally wrong but it's worth a shot.

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Old 10-31-2013, 08:45 AM   #3
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Yes check your RCA cables. They could be getting interference. Plug an MP3 player directly into the amps RCA jack via a headphone to RCA cable.
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Old 10-31-2013, 11:09 AM   #4
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So in theory to check if it's the rcas I can unplug them from the amp and the noise should stop?
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Old 10-31-2013, 11:54 AM   #5
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Yes. In theory..
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Old 10-31-2013, 01:05 PM   #6
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Ok so during my lunch break I went out to my jeep and unplugged the RCA cables from the amp and the sound stopped so I undid the wire from where I had them running originally and just as a quick test just ran them up the middle of the car by draping them over the seats and I plugged them into the amp and the sound is still happening...... Where do I go from here 😩.... Thank you for all the help so far everyone
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Old 10-31-2013, 01:19 PM   #7
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Quote:
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Ok so during my lunch break I went out to my jeep and unplugged the RCA cables from the amp and the sound stopped so I undid the wire from where I had them running originally and just as a quick test just ran them up the middle of the car by draping them over the seats and I plugged them into the amp and the sound is still happening...... Where do I go from here dde29.... Thank you for all the help so far everyone
Another shot in the dark....do you have another RCA cable you can try? If it's a cheap version or it could be damaged. Not likely but worth a try.
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Old 10-31-2013, 01:29 PM   #8
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RCA cables are fine indoors - when you use then outside they can pick up all kinds of dirt, and they aren't interference proof. I still don't know why these are used on amps. If you get them working, use some good electrical tape, or even rubber tape, and cover the connections as much as you can.

Also, quality of the RCA cables varies a lot. Look for shielded cables.
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Old 10-31-2013, 01:50 PM   #9
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Ok, try a new set of RCAs. If there is still noise then it's likely feeding through your head unit. May need to run new ground to a solid spot or try a ground loop isolator.
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Old 10-31-2013, 03:23 PM   #10
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Originally Posted by Ceagar View Post
Ok so I installed a new head unit speakers and a amp this weekend. Out if the speakers I'm getting this high pitched buzzing noise dde29.... When I hit the mute button on the head unit the noise stops.... I checked the ground on the head unit and it still does it. When I turn the music up you can hear the noise less I guess since obv there is now music playing out if it..... So this leads me to think its something with my amp.... So I tried to turn the gains down and the volume of the noise decreases..... So my question is HOW DO I GET RID OF THIS IRRITATING NOISE?!?!?!? PLEASE HELP ME!!!! Let me add this I have read that this issue can be caused by grounding.. I grounded the amp to the rear seatbelt bolt in my jeep wrangler.... I cleaned of the paint in the body and on BOTTOM(didn't sand the top) of the seat belt bracket.
.

First try some different cables that might be your problem - you will want to get some cables designed for in car use that have twisted wiring.

I would guess it is something else, specifically your gains being too high on your amp. Amp gains are NOT meant to make your stereo louder, they are meant to match the output of your head unit to your amp. When your head unit is maxed out, you amp should reach its highest volume with NO distortion. Over driving your amp is the #1 culprit of hiss.

If it is Hum, that could be a ground loop problem. If that is the case, you may need to put both the HU and the Amp on the same ground point.
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Old 10-31-2013, 04:30 PM   #11
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I would definitely turn down the gain. If you can turn the gain down, and the noise goes away, or is minimal, then, turn up your stereo to the maximum listening level, and check for good sound quality without distortion. One problem seems that maybe you have your gains set too high.

Then, check to see if you hear the buzz on the CD player, and other sources on your HU, such as AUX, Radio, internal SD card, etc. This way you can isolate what source might be causing the noise interference. I would definitely purchase high quality RCA cables.

Some of the cheaper stereo's have interference problems. The best thing to do is to make sure all your units are properly grounded. Check that your engine grounds are connected properly too. There is a flat ground cable behind the engine, connected to the top of the firewall, that splits into two cables. One side connects to the manifold. The other cable goes to your negative battery cable at the engine block. This makes sure that your tub and firewall are properly grounded. Then, inside the vehicle, behind the stereo, there is also another ground cable, that connects behind the instrument panel or sometimes it is on the firewall. You can move it around and maybe find a better ground point that may help to reduce or eliminate the noise. You might want to check if it is actually connected. Sometimes, this cable is removed, or not grounded to the chassis. This was the case for me after my stock radio was removed. My aftermarket radio was connected to the ground cable, but the other end wasn't even connected to the vehicle. You might want to ground your stereo chassis too, as well as making sure your ground cables on your radio are properly connected to a grounded source.

Next, you may need to get noise reduction units. I had no noise in my CD source, but I had awful noise in my AUX source. So, I ran a noise reducer through my AUX source plug, and that zapped it. You have to troubleshoot the system and determine what is causing the noise.

I actually purchased a noise reducer for my RCA cables, my power and my AUX. All three noise reducers cost me $25.00. I had this problem with stereo's in the past. In my Mustang, it was my power source that was causing the noise. In my Jeep, it was my AUX source. The problem is that when you amp the stereo, you also amp any noise interference.

Below the picture at the link to the power noise suppressor, there is a discount for all three noise supressors. There is a RCA noise suppressor, A line noise suppressor, and the power noise suppressor. I just brought all three for the discount, and I was able to troubleshoot exactly what source was causing my noise interference. It was the line noise suppressor that worked for me, which I connected to my AUX. I also threw in the power noise suppressor, into my system, just for good measure. The RCA noise suppressor did nothing for me, but I wasn't getting any noise from my CD source, so obviously it wasn't my amp or RCA's. Because, if it was, I would have been getting noise from all sources. I would also check to see if you get more noise from one source over another source.

Amazon.com: Pyramid NS12 12 Amp InLine Noise Suppressor: Count Bishops: Car Electronics
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Old 11-30-2013, 02:56 PM   #12
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It's possible that your head unit doesn't ground your RCA outs that well

I know some pioneer head units have this problem

Strip some copper wire and wrap it around the RCA outs on the head unit and ground it to some where on the head unit
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Old 11-30-2013, 07:54 PM   #13
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It's possible that your head unit doesn't ground your RCA outs that well

I know some pioneer head units have this problem

Strip some copper wire and wrap it around the RCA outs on the head unit and ground it to some where on the head unit
Don't do this... Without a capacitor you can get DC interference in your AC signal path...
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Old 11-30-2013, 08:15 PM   #14
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Don't do this... Without a capacitor you can get DC interference in your AC signal path...
Why wouldnt you do it?

Its not harmful in any way and takes 10 mins and virtually free....its a well known easy fix

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Old 11-30-2013, 08:41 PM   #15
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Because the RCA carries an AC signal. The stereo chassis is a DC ground point... Maybe if you're not using the RCAs for anything this would be ok but I can't see it being healthy for the signal trying to get to an amplifier
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Old 12-01-2013, 06:48 AM   #16
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Why wouldnt you do it?

Its not harmful in any way and takes 10 mins and virtually free....its a well known easy fix

If its a pioneer head unit this could very well be the problem. This started happening when pioneer switched from mosfet power suppples to jfet power supplies about 10 years ago and its very very common . and this is exactly how Pioneer will tell you to fix it if you don't want to send it back. this happens when the unit is on and the rcas are plugged or unplugged into the unit the ground side of the power supply burns itself out.
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Old 12-01-2013, 11:54 AM   #17
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After looking at some transistor amplifier schematics, you're correct.. One side of the audio signal is common with DC ground so theoretically this won't hurt anything and could possibly fix the problem.
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Old 12-12-2013, 11:54 PM   #18
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This sounds like a standard Ground Loop issue. This can be a nightmare to mess with and you can waste hours trying to figure out the issue. As someone else stated, just put a cheap Ground Loop Isolator in line. They can be found at Radio Shack for around 14.00.

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