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    Aaron Dixon's Avatar
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    Icon33 At a loss on fixing sub Humming...

    I've been reseaching about why subs hum, and I've tried pretty much everything I've read, except things like LOC and Ground-loop isolator. I traded someone in my family cash for an audio system out of a Ford Ranger.(Maybe it was damaged or dropped is the problem???) I put it in my 98 Sable, so it sounded okay at first, but I got a better and vented box for the 10 inch kickers. Now I can hear a very loud buzz/hum. At first I had all the same wires running next to each other, so I moved the RCA to the other side of the car...it kind of helped, but not too much. I can hear it beat, while it's humming, if I push the trunk lock, and I've even noticed when I stop, then take off, it gets a bit louder then levels off...This is only really noticeable with no music playing. When the radio is off or the deck is loading is when it hums so loud you can feel it in your chest. Now if I go and just look or feel the subs while music is playing I can feel and see it beating not to music, but to a constant interferance tempo....Everything I've looked at tells me GROUND problems, but I've checked them again and again. The amp is grounded under the rear seat, and the deck plugs into a harness, which the ground comes out to the truck screwed down. I used wire nuts to secure the wires on the back of the deck. If I unplug one of the RCA from either side the humming cuts almost to none, but if I unplug 2 from one side, it hums really loud again. I'm no pro at this, and I'm thinking I'm overlooking something, or could it be damaged amp or deck? Since this car has me used a harness I had the amp remote, deck remote connected to harness ignition.
    I'm also ASSUMING this worked in the Ranger without a hum, I didn't it hear, but could see it with the small boxes (I saw it hitting with not music playing in MY car), but now with the "Polk Audio" box....well the hum.

    Here is what I'm using-
    new sosche wiring kit (remote, power, ground, RCA all for amp)
    new sosche 98 sable kit ( 98 conversion harness, NOS faceplate,antenna,)
    used Proformance Teknique DVD deck
    used Power Acustic amp
    used 10 inch 2X kickers (not sure what OHM or anything)

    I really want this solved, if you need pictures I'll take them.
    Thanks, Aaron







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    jco1385's Avatar
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    Re: At a loss on fixing sub Humming...

    Quote Originally Posted by Aaron Dixon View Post
    I traded someone in my family cash for an audio system out of a Ford Ranger.
    around here, thats called buying.

    start by grounding the rca's to the deck.



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    Re: At a loss on fixing sub Humming...

    yes HU needs to be grounded prob.




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    Re: At a loss on fixing sub Humming...

    start by grounding the rca's to the deck.[/QUOTE]

    I've heard of this too, but the RCA input/outputs on the deck are on cords, then turn to RCA plugs with caps on them. How would I ground them?




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    Re: At a loss on fixing sub Humming...

    look up 'grounding rcas'

    basically strip about 4-6" of speaker wire, then wrap said wire around the rca outputs, in a figure 8 or similar. then take the pigtail end you have left and use a close screw on the HU to secure it.

    something like this:


    then i want a cookie.



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    MTX 404 runs the inside
    MTX 1501d runs the X
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    2x Optima G31 YT in the trunk
    200a EA HO Alt (1/0 Big 3)
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    Re: At a loss on fixing sub Humming...

    This is what it has though....I can't really ground wires on them.
    http://www.caraudio.com/gallery/show...hp?i=12528&c=2
    Should I try a new HU?




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    Re: At a loss on fixing sub Humming...

    pic didn't work. but if i get what you're saying, then do it at the amp. mine are done at the amp and the HU.

    edit: or wrap the wire onto the rca plug and leave the jacket on the length of wire back to the HU and use a screw like shown.

    edit x2: never heard of your HU brand, so it probably wouldnt hurt to get another one and try it at least.



    1994 Thunderbird
    JVC KD-AV7010
    Alpine 6x9 3-ways
    Pioneer 6x8 3-ways (rear)
    JVC CH-X1500 12-disc MP3 Changer
    Alpine Type X 12" 2 cubes @ 30hz
    MTX 404 runs the inside
    MTX 1501d runs the X
    Optima G75/25 RT up front
    2x Optima G31 YT in the trunk
    200a EA HO Alt (1/0 Big 3)
    ALL MY WIRE IS WELDING CABLE
    Quote Originally Posted by Johnny Drama View Post
    I always knew I was a feggot.
    Quote Originally Posted by Rashaddd View Post
    We're all feggots on the inside
    Quote Originally Posted by ToledoTom View Post
    I am sure the administration will be having a few words with you when they catch wind of your language.
    DO NOT SEND ME ANYTHING USING UPS. I WILL NOT DEAL WITH THEM EVER AGAIN
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    Aaron Dixon's Avatar
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    Re: At a loss on fixing sub Humming...

    Grounded the RCA on amp....still nothing different. I tried taking the ground that goes to the harness and grounded the deck to the firewall, didn't change anything either....Could the amp be bad as well? Or is this stricly a deck problem?




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    jco1385's Avatar
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    Re: At a loss on fixing sub Humming...

    Quote Originally Posted by jco1385 View Post
    edit: or wrap the wire onto the rca plug and leave the jacket on the length of wire back to the HU and use a screw like shown.
    try this. it could also be the amp i suppose.



    1994 Thunderbird
    JVC KD-AV7010
    Alpine 6x9 3-ways
    Pioneer 6x8 3-ways (rear)
    JVC CH-X1500 12-disc MP3 Changer
    Alpine Type X 12" 2 cubes @ 30hz
    MTX 404 runs the inside
    MTX 1501d runs the X
    Optima G75/25 RT up front
    2x Optima G31 YT in the trunk
    200a EA HO Alt (1/0 Big 3)
    ALL MY WIRE IS WELDING CABLE
    Quote Originally Posted by Johnny Drama View Post
    I always knew I was a feggot.
    Quote Originally Posted by Rashaddd View Post
    We're all feggots on the inside
    Quote Originally Posted by ToledoTom View Post
    I am sure the administration will be having a few words with you when they catch wind of your language.
    DO NOT SEND ME ANYTHING USING UPS. I WILL NOT DEAL WITH THEM EVER AGAIN
    OFFICIAL FEEDBACK THREAD

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    Re: At a loss on fixing sub Humming...

    Take your subs out the box and check all connections. You said this problem started happening when you switched boxes and it's coming from the subs so I would start by checking there. You may have put a positive/negative wire in the wrong terminal.



    Headunit - Pioneer DEH-P8300UB
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    Quote Originally Posted by zako View Post
    Most properly done 15 inch subwoofers are not suited for car audio use simply due to box size requirements.

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    Aaron Dixon's Avatar
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    Re: At a loss on fixing sub Humming...

    It's not switched wires, and I checked just to make sure. Also, it did do it before I switched boxes. Sorry if I didn't make that clear. The subs have A LOT more power now. Before I switched boxes, my stock subs by the rear window overpowered the kickers, but if you went and looked at the subs, they clearly were hitting even with my music, just like they are now. Pretty drastic change, the only thing I changed in the sub box was the original wires that go to sub to the outlet in the back were not long enough, so I made them longer. This is a ground issue.. it changes with RPM and other electronics in the car. I did the wire grounding to the deck too. I'm guessing the HU or amp is bad now......HU AUX doesn't work I just found out...So...I'll start with replacing it.




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    jco1385's Avatar
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    Re: At a loss on fixing sub Humming...

    you dont have the gain on the amp maxed out do you?



    1994 Thunderbird
    JVC KD-AV7010
    Alpine 6x9 3-ways
    Pioneer 6x8 3-ways (rear)
    JVC CH-X1500 12-disc MP3 Changer
    Alpine Type X 12" 2 cubes @ 30hz
    MTX 404 runs the inside
    MTX 1501d runs the X
    Optima G75/25 RT up front
    2x Optima G31 YT in the trunk
    200a EA HO Alt (1/0 Big 3)
    ALL MY WIRE IS WELDING CABLE
    Quote Originally Posted by Johnny Drama View Post
    I always knew I was a feggot.
    Quote Originally Posted by Rashaddd View Post
    We're all feggots on the inside
    Quote Originally Posted by ToledoTom View Post
    I am sure the administration will be having a few words with you when they catch wind of your language.
    DO NOT SEND ME ANYTHING USING UPS. I WILL NOT DEAL WITH THEM EVER AGAIN
    OFFICIAL FEEDBACK THREAD

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    Aaron Dixon's Avatar
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    Re: At a loss on fixing sub Humming...

    Okay, I think I'm on to SOMETHING, but not sure what...
    I changed the deck to a Kenwood KDC-348U, so I now have a lot more control over the sound, plus I know nothing is wrong internally. I moved the remote wire away from the amp power cable. I moved the amp ground. I did get a ground loop isolator, but I removed it because it kept blowing fuses. Now when the HU is off it DOES NOT hum in a deafening tone, but more like a small buzz that barely moves the subs. BUT BUT....after about 20 seconds the deafening tone comes back full blast. I bought a cut off switch that I'm going to install tomorrow for the amp...Not a fix, but a cheat I guess...Since moving the remote helped a bit...I should say the wiring harness that came with my 98 kit is still by it, but the noise is only from the subs. I did not ground the new HU RCA ports. Any other suggestions??




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    Re: At a loss on fixing sub Humming...

    I have had an issue before with humming/noise. Sometimes running the power wire along side with the rcas will do that too?? Also check or find another location for the amp ground?? May be loose also?? Something to consider??Or bad rca connection on radio/amp??




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    Re: At a loss on fixing sub Humming...

    wait, do you still have it run through the loc? if so, get your sinal right off the deck, or cross the speakers over so that they play high/mid only (capcitor, or passive cross-overs), or simply unplug the speakers that you get the signal from. i have seen it many times, the speakers are acting like a microphone and feeding the amp a signal from any louder noise, like closing the door, or hitting bumbp, etc, and the defaning tone is it feeding the noise from the subs right back to them. i have seen it way worse than what you have going on. you hae to stop sound from being fed to the rca jacks by the speakers. if you need an loc, passive crossover is the only way to keep your speakers hooked up that feed the signal. low out on the cross-over should feed only the loc.



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