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Reload Thread: My subs got stolen and now i have a ground loop?

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    cobra133's Avatar
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    Icon32 My subs got stolen and now i have a ground loop?

    OK, I'm going to try and explain the situation at hand. It is a bit complex, so if I didn't do a good job explaining anything, please tell me and I will try and clarify things.

    System before having subwoofers stolen:

    Equipment

    4 channel clarion amp (powering 6 speakers) (4 at 2ohms) (2 others at 4 ohms) (it is rated/safe for this)

    2 channel alphasonik amp (powering 2 10" subs)

    1 Alpine CDA-9825 headunit.

    3 20' streewires rca cables

    1 20' 4 gauge power cable with a distro block

    How everything was put together:

    OK, I had the rca cables and the remote on cables, as well as the front speaker cables, running along the right side of my car. They were connected to my amps respectively. On the left side of my car I was running my 12V 4 gauge power cable. It was connected to a distro block and I was using 2 10 gauge power cables to connect both of the amps. The amps were then grounded to the chassis of my car with a bolt. The grounding cables for both amps were 10 gauge. They were both about 3.5 feet long. I know that this setup is not ideal, but everything sounded perfect. There was no engine noise, no headlight dimming, everything worked exactly as it should have.

    ================================================== ========

    OK, then came the break in. About a week ago some ****ups broke into my car and stole my subwoofers, and the amp that was powering them. Luckily I had the clarion 4 channel amp bolted to my back seat, and they couldn't get it off. They tried. I know that they tried because there is a big chunk of metal missing from it. About the size of a 1/4 of my pinky finger. IN the process of my subs/1amp getting stolen. The rca cables for my 4 channel amp got damaged. THe ground I was using also got damaged.

    ================================================== ========

    Ok, now what I did to fix the problem. First and foremost, filed a police report. I live in a ****** part of town and I want the finger prints to eventually get back to someone. Not because they will be convicted of a crime, so I can go back and beat the **** out of the ****er who stole my stuff.

    Anyways, I bought a new amp (logic sound labs 2 channel) to power my two new subs, mtx thunder 6000 brand new just lying around in the back of a car audio store. I also had to make a new ground, so I am using the seat belt buckle after scraping of the paint. Then, I hoooked everything up. I'm still using 10 gauge wires for both power and ground.

    ================================================== =======

    Now, I have a HUGE ground loop. I've done TONS of testing trying to isolate the problem, but its no use.

    When my car's engine is not turned on, I get a massive loud crack/boom/pop sound when I turn my car on accessory mode, from all of my speakers, including my subs. This did not happen before. Then, my speakers keep on crackling/popping whenever the music is playing. Also, when i turn either my car off or the head unit off, I get another loud crack/boom/pop sound from ALL of my speakers, including my subs. IN addition to this, whenever I put a cd in or change a cd track, I can hear it through my speakers. Its is hard to describe. It is like a wierd crackling/hissing noise. It sounds like really fuzzy feedback on an electric guitar amplifier.

    Now, if I turn my car engine on, things really get bad. I've heard engine noise before, but not like this. Its gotta be nearly 80 decibels. I can hardly talk in my car. And the alternator whine is out of control. If I give the car gas, the engine whine is even louder, not just higher pitched.

    Here is what I've figured out:

    1. I know it is not the rca cables themselves. I bought high quality rca cables.
    2. I brought in a home audio reciever to my car and plugged in the rca cables to the back of it, then i listened to the singal with headphones. When i plug in the rca cables to the headunit, even when it is off, i hear alot wierd ground loop hummings, even when the key is not in the iginition. When the rca cable is not in the head unit, even when the car is off, I do not get as much of a ground loop hum. When I turn the head unit on/car on/off I do not hear all the wierd noises I did before. Just a loud hum and quiet music.
    3. I've tried about 3 different grounds in the back of my car (my amps are mounted to my back seats), none of them has stopped this problem.
    4. My speaker cables, power cables, and ground cables do over lap at one place, but they did this before all this crap happened, could this be a source of my problem?
    5. If i remove the rca cables from the amps, all of this crappy noise stops. I only hear peaceful slience.
    6. I've tried both of the amps seperately, they still have this problem.
    7. I tried running rca cables directly from my head unit to the amps ,through the middle of my car, this did no good.

    Does anyone know what I should do to solve this problem. Does anyone know what the problem is? Furthermore, could a ground loop isolator solve this problem? If so, would it hurt the sound quality of my stereo system? Using electrical theory, it should not, but i don't feel like spending 60 bucks just to find out that I have a new problem, bad clean sound.

    THank you in advance to anyone who helps out/reads this. I know it is alot to take in. Thanks!







  2. #2
    LBX2G's Avatar
    LBX2G is offline R.I.P Camofluage



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    Re: My subs got stolen and now i have a ground loop?

    they say the the seatbelt bolt is not a good ground.



    FREE Terrelll"peanut" Grayer!!!!!!!!!!!!!!!!!!!!!!!!!!

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    Re: My subs got stolen and now i have a ground loop?

    I'm inclined to agree with you. So in order to counteract that, I scraped off all the paint around the bolt, and then used a huge washer under the bolt to smash the grounding wires onto the chassis.

    Thanks for your time.




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    Re: My subs got stolen and now i have a ground loop?

    did it work



    FREE Terrelll"peanut" Grayer!!!!!!!!!!!!!!!!!!!!!!!!!!

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  5. #5
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    Re: My subs got stolen and now i have a ground loop?

    Saddly, no.




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    Re: My subs got stolen and now i have a ground loop?

    re wire everything...when it doubt, overhaul




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    Re: My subs got stolen and now i have a ground loop?

    Thus far, the only thing i haven't rewired is the power cabling going to the distro block. And honestly, as long as it is on the other side of the car from the rca cables, and is getting 12V, it shouldn't make any difference.

    Thanks




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    Re: My subs got stolen and now i have a ground loop?

    Could a ground loop isolator fix the problem without hurting the sound quality of my stereo system?




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    Re: My subs got stolen and now i have a ground loop?

    bandaid




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    Re: My subs got stolen and now i have a ground loop?

    Quote Originally Posted by Black_Jesus
    bandaid
    yea, but a bandaid just might be all he needs.
    Why put stiches in a cut that only needs a bandaid.


    Just try it and see if it works. If not take it back and try something else.



    97 Monte Carlo
    H/U - Kenwood Cd\MP3(KDC-MPV6022) - Up For Sale
    The All Power Acoustik System (Removed)
    Amps(2) - Class D 3000watt (A3000DB)
    Subs(2) - 15" MOFO 2600watt(MOFO-15)
    Caps(2) - 2.4 Farad Digital Cap (PC2.4)
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    New System Yet To Be Determined. Although It Will Be All MA Audio.

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    Re: My subs got stolen and now i have a ground loop?

    it worked before fine, it can work again.

    DO IT RIGHT *slap*




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    Re: My subs got stolen and now i have a ground loop?

    its possible that your headunit got fu(ked, got another one to slap in to check out? even the stocker?




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    Re: My subs got stolen and now i have a ground loop?

    Yea, my g/f has a spare one in her trunk. I'll give that head unit a try. Thanks for all the help.




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    Re: My subs got stolen and now i have a ground loop?

    run your grounds to a distro block,4 gauge out of the distro to bare metal. make them as short as possible. the one amp they didnt get might also be messed up if they hit it hard enough...



    Refs: Diyma.com, Caco.com

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    Re: My subs got stolen and now i have a ground loop?

    If I run the ground from the headunit to the amps (back seats), can that ground be too long?

    Thanks




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