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Help with connecting the JBL subwoofer

Kangal97 Posted messages 7 Status Member -  
 lunanath -
Hello everyone, I'm new to the site which I find very useful.
I own a JBL GT5 1204BR subwoofer with a set of cables.
Since I'm not very knowledgeable about electricity, I would appreciate some guidance on the connection devices (I've been told that the red power cable should be connected to the battery—can it be directly connected to a 12v socket that I have in my trunk?) and also some tips on how to run the cables from the trunk to the driver's cabin.
I have an Alfa Romeo GT if that helps, and I can take photos so you can better inform me.
Thank you in advance for your future replies,
Best regards.

14 answers

  1.
    kevin14789 Posted messages 1565 Registration date   Status Member Last intervention   394
     
    Uh, you need a mono amplifier or a 2-channel one to run the sub

    For the wiring, you need a + going from the battery with a fuse holder

    And for the -, you connect to the ground (on a bolt of your chassis)

    And also RCA cables

    What radio do you have?

    Kenwood KDC-4754SD
    MTX TH904 > woof MTX T8652 > MTX road thunder
    Alpine V12 MRV-F305 > tweets MTX T8652
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  2. Kangal97 Posted messages 7 Status Member
     
    Hello and thank you for your response.
    My unit is a Pioneer AVH-5300DVD.
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  3. Kangal97 Posted messages 7 Status Member
     
    And I wanted to know where I can run my cable from the trunk to the battery?
    Thank you :)
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  4. kevin14789 Posted messages 1565 Registration date   Status Member Last intervention   394
     
    I found two people who have already done it:

    On the Engine Side:

    We calculated, and by lubricating the cables, we can fit three 50mm, but first, you need to remove a rubber piece (it can be removed by hand without force).
    In the photo, there’s one 35mm and one 50mm

    Here’s how to land the cables inside (here, you can fit three 50mm cables without lubricating, though).

    To enlarge, you simply need to cut with a knife because behind this foam, there’s rubber, but it doesn’t come off; just cut as if you were making a plus sign and push it with your fingers, and the rubber will simply take the shape!

    Now, here’s where the power cables land!

    Right behind the glove box!

    and

    -Open the hood
    -Remove the three screws holding the plastic piece under the passenger side windshield wiper.
    -Unclip it.
    -Underneath, you see the sheet metal, and in this sheet metal, there’s a large rubber plug 5cm in diameter.
    -Drill through it; behind there's a kind of carpet.
    -Run your cable through

    And you will see it come out behind the glove box; you may need to remove it for peace of mind!

    Everything I found
    --
    Kenwood KDC-4754SD
    MTX TH904 > woof MTX T8652 > MTX road thunder
    Alpine V12 MRV-F305 > tweets MTX T8652
    0
    1. lunanath
       
      Good evening,

      We have a 12 mm cable that we can't get through; we've tried through the doors and everything.

      We also have an Alfa Romeo GT.

      So, you're saying that we need to remove the plastic cover near the windshield wipers and then we find a round plastic piece, is that correct?

      Thank you.
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  7. Kangal97 Posted messages 7 Status Member
     
    Thank you, Kevin, for all this information. I'll try all that and keep you updated.
    Just one thing, I connect the ground to a bolt on the trunk's body, right?
    And to connect the cable to the battery, do we need to disconnect it or remove it?
    Thank you very much.
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  8. kevin14789 Posted messages 1565 Registration date   Status Member Last intervention   394
     
    Yes, you definitely need to put on a mass bolt by properly sanding the paint.

    Uh, I didn't understand that: And to connect the cable to the battery, do we need to disconnect it or remove it?
    --
    Kenwood KDC- 4754SD
    MTX TH904 > woof MTX T8652 > MTX road thunder
    Alpine V12 MRV-F305 > tweets MTX T8652
    0
  9. Kangal97 Posted messages 7 Status Member
     
    To connect the power cable to the + of the battery, should we disconnect the battery during the manipulation?
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    1. letotof Posted messages 2149 Status Member 482
       
      No, as long as you don't put the fuse in the fuse holder, you won't have any problems. To connect the ground cable for the amp, attach it to the grounding point in the trunk by sanding off the paint to expose the bare metal. Only after connecting the cables to the amp can you put the fuse in the fuse holder.
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  10. kevin14789 Posted messages 1565 Registration date   Status Member Last intervention   394
     
    no, it's not mandatory, just be careful that the cable must not come into contact with the bodywork

    --
    Kenwood KDC- 4754SD
    MTX TH904 > woof MTX T8652 > MTX road thunder
    Alpine V12 MRV-F305 > tweets MTX T8652
    0
  11. Kangal97 Posted messages 7 Status Member
     
    Thank you very much!
    I will try all of this, I will give updates to let you know how it goes!
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  12. kevin14789 Posted messages 1565 Registration date   Status Member Last intervention   394
     
    What amplifier do you have???

    --
    Kenwood KDC- 4754SD
    MTX TH904 > woof MTX T8652 > MTX road thunder
    Alpine V12 MRV-F305 > tweets MTX T8652
    0
  13. Kangal97 Posted messages 7 Status Member
     
    JBL GT5-A3001
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  14. kevin14789 Posted messages 1565 Registration date   Status Member Last intervention   394
     
    did you get this amp with the sub?

    it will never be able to drive the sub, the sound quality will be very poor, I advise you to change this amp

    --
    Kenwood KDC- 4754SD
    MTX TH904 > woof MTX T8652 > MTX road thunder
    Alpine V12 MRV-F305 > tweets MTX T8652
    0
  15. yann30210
     
    Hello, after running the cables behind the junction box, where should I go to connect to the trunk? Through the door? Under the carpet?
    Thank you in advance.
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    1. letotof Posted messages 2149 Status Member 482
       
      hi

      there is a cover between the carpet and the door that either clips in or screws in, so you remove this cover and run your RCA cables and the blue remote wire, and you run the big red cable to the other side, actually on the battery side, to avoid interference.
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