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Thread: How to wire this, sound keeps getting worse and worse!!

  1. #1
    Maximum Bitrate pyros's Avatar
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    How to wire this, sound keeps getting worse and worse!!

    Need some help here guys on what I should use.. here is my deal:

    In my trunk is:

    2 amps (1 for highs, 1 for subs)
    1 crossover
    soundcard
    xm reciever

    What needs to be connected:
    - From the factory wiring harness, a set of RCA's run to the trunk to the mid-range output on the crossover. This runs down the passenger side of the car.

    - From the factory wiring harness, speaker wire runs to the trunk to the output of the amp used to power the highs (from the factory the car comes with 2 amps for the mid range but the highs are powered by the deck which is now gone). This runs down the passenger side of the car.

    - From the battery to the driver side kick panel is a 4 guage power wire which connects to a power distribution block.

    - From the power distribution block to the computer is an 8 guage power wire. The computer is located in-dash so it does not cross any other wires.

    - From the power distribution block to a distribution block in the trunk is another 4 guage power wire.

    - From the glove box to the trunk is a usb cable. This runs down the passenger side of the car.


    My RCA's that connect the mid-rang output on the crossover to the factory wiring harness are shielded.

    I believe the speaker wire is not shielded.

    I am getting tons of interference and engine whine:

    1) On the highs, I get static and a consistent beeping sound. Once the stereo is playing, it is still there but very hard to hear.

    2) On the mids, I get more static and a lot of engine whine. This one is the last one I expected to have a problem with since the RCAs are shielded.

    Right now I'm running just on highs because I can't take the noise the mids are making. Any suggestions on what to do? I'm contemplating redoing the wiring all together, any suggestions on what to use if so?

    Thanks,
    Chris
    2004 Ford Mustang Mach 1
    Specs: Epia M2-1000, 512mb ram, SB Audigy NX, Lilliput 7" Touchscreen, M2-ATX, DVD, 160gb HDD, gps, obdII, wifi, bluetooth, XM radio, HQCT and Logitech wireless gamepad.
    Install Status: DONE

    My XM FAQ

  2. #2
    FLAC
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    Did you bypass your Ford amp or are you using it?

  3. #3
    Newbie JeffsGotMilk's Avatar
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    Quote Originally Posted by pyros View Post
    I'm contemplating redoing the wiring all together, any suggestions on what to use if so?
    What you have is a ground loop problem. 99.9% of all ground loop problems are because of a poor ground. Make sure that your source unit has a solid ground and also your amps. Run your rca wires away from any other wires. Clean up any spaghetti bowls of wire, if you have them. That should take care of the problem. If not, give me a shout and we can take it to the next level.

    Are you using line out converters for your rca's and not the source unit?

  4. #4
    Maximum Bitrate pyros's Avatar
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    Shadow: I'm using them.. there are 2 factory amps.. they power my mid-range speakers...

    JeffsGotMilk: Thx for the reply.. what are you referring to as a source unit? The computer or the soundcard? The soundcard is a SB Audigy NX (external, usb) with a home made power adaptor... could a bad ground on that cause my problems? If so, why only in the mid-range and not as bad in the highs? I guess its just the actual frequency of the whine that causes the crossover to filter it from one but not the other?

    I'll try to clean everything up and redo my grounds and see how it goes.. thanks!

    I am not using a line-out converter but i'm using something close... the wiring harness from metra somewhat has a lineout converter built into the harness.. i'm sure the technology is the same.. it sjust part of the harness you buy from them...
    2004 Ford Mustang Mach 1
    Specs: Epia M2-1000, 512mb ram, SB Audigy NX, Lilliput 7" Touchscreen, M2-ATX, DVD, 160gb HDD, gps, obdII, wifi, bluetooth, XM radio, HQCT and Logitech wireless gamepad.
    Install Status: DONE

    My XM FAQ

  5. #5
    FLAC
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    Your stock amps power everything. The subwoofer amps are hard to integrate with any aftermarket stuff. Your stock amps have crossovers built into them so you're adding another issue by using an extra crossover. Low-level signal wires are what pick up noise. If you could put your crossover in the front you'd almost eliminate the need for long noise-inducting cables. Currently your signal goes through USB to the sound card and then into interconnects and into your crossover. You then run those wires back to the front of the car into the stock harness. Then those wires run back to the amps crossing over the wires carrying the signal back from the crossover.

    Is your computer case grounded? When you say "home made power adapter" what are you talking about?

    A bad ground is the 99% likely cause of your problems.

  6. #6
    Maximum Bitrate pyros's Avatar
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    My stock amps do not power everything. On 03/04 mustangs the 3rd amp that powered the highs was removed in favour of an on-board amp on the factory radio. There are two sets of midrange speakers, 4 6" woofers, 2 6x9's in teh back,2 in the front, and 2 1" drivers in the speaker grills in the corner next to the sideview mirrors.

    One of the amps powers the woofers, the other amp powers the 6x9's. The 1" drivers were powered by the deck from the factory, but that is now removed so they are powered by an external amp.

    There are no subwoofers stock from the factory as this is the mach 460 system, not the mach 1000. The sub I have was added by me and is powered by a separate amp.

    So in total I have four amplifiers

    factory amp #1 - powers the woofers
    factory amp #2 - powers the 6x9's
    aftermarket amp #1 - powers the highs
    aftermarket amp #2 - powers the sub

    The stock amps do not have built in crossovers. This was also removed by ford and handled by the deck for 03/04...

    As far as the length of the wiring, you are correct there. However the wires do not cross as the factory ones are run under the carpet and through paneling. Mine are quite a distance away.

    The computer case itself should be grounded. It is bolted to a metal frame that is connected to the chassis.....

    the home made power adaptor is just the connector... power goes to +5v on the computer.. ground grounds to the car...

    I agree a bad ground sithe problem.. just gotta find it

    Thx
    2004 Ford Mustang Mach 1
    Specs: Epia M2-1000, 512mb ram, SB Audigy NX, Lilliput 7" Touchscreen, M2-ATX, DVD, 160gb HDD, gps, obdII, wifi, bluetooth, XM radio, HQCT and Logitech wireless gamepad.
    Install Status: DONE

    My XM FAQ

  7. #7
    FLAC
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    Man, that's a MAJOR system change that Ford did. That's more info in my book.

    the home made power adaptor is just the connector... power goes to +5v on the computer..
    What is this powering?

  8. #8
    Maximum Bitrate pyros's Avatar
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    Well it wasn't really ford who changed it.. it was the manufacturer of the components (I forget the name). I may be a little off on the sizes of the speakers, its been almost 2 years since I had it all memorized like the bank of my hand when I did my install ;P

    That adaptor is powering the sound card.. it needs an external +5v....

    I pulled apart the connector and the solders are fine.... rewired it back up anyway but didn't solve anything :/
    2004 Ford Mustang Mach 1
    Specs: Epia M2-1000, 512mb ram, SB Audigy NX, Lilliput 7" Touchscreen, M2-ATX, DVD, 160gb HDD, gps, obdII, wifi, bluetooth, XM radio, HQCT and Logitech wireless gamepad.
    Install Status: DONE

    My XM FAQ

  9. #9
    FLAC
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    What's that power supply grounded to?

  10. #10
    Maximum Bitrate pyros's Avatar
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    It is grounded to a bolt that bolts into the body of the car....
    2004 Ford Mustang Mach 1
    Specs: Epia M2-1000, 512mb ram, SB Audigy NX, Lilliput 7" Touchscreen, M2-ATX, DVD, 160gb HDD, gps, obdII, wifi, bluetooth, XM radio, HQCT and Logitech wireless gamepad.
    Install Status: DONE

    My XM FAQ

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