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JBL Subwoofer Questions

Discussion in 'Audio & Video' started by SocalTaco15, Feb 7, 2017.

  1. Feb 7, 2017 at 6:09 PM
    #1
    SocalTaco15

    SocalTaco15 [OP] Well-Known Member

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    I've used the search feature and couldn't find an answer.

    I scored a practically new JBL sub (and plastics) without the amp. I have the base entune radio, with 4 speakers and tweeters. I'd like to add an 100w amp of my own and use either a LOC or high level inputs from the rear speakers, and add the sub. I know enough about electrical to wire the amp properly, but what I don't know is what wires to hook up on the amp to the sub. The JBL wiring diagram has signal out of the amp from left and right rear to the sub. I know the sub is a dual voice coil.

    So, my question is this: Do I use a 2 channel amp and connect it to the sub in a similar fashion , i.e.: both channels, or bridge it?

    Thanks in advance.

    IMG_6638.jpg
     
    Last edited: Feb 7, 2017
  2. Feb 8, 2017 at 8:59 AM
    #2
    jv_74

    jv_74 Well-Known Member

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    Well I would definitely bridge it. Not wire the voice coils as seperate channels. The question becomes whether or not you want to wire them in series or parallel.

    Need to know the ohms rating of each voice coil
     
  3. Feb 8, 2017 at 9:27 AM
    #3
    SocalTaco15

    SocalTaco15 [OP] Well-Known Member

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    The coils are 2ohms each from what I've read. So in theory I bridge the amp and connect one positive and negative terminal on the sub to make them fire together?

    It may make more sense to get another single coil sub in the long run.
     
  4. Feb 8, 2017 at 10:32 AM
    #4
    jv_74

    jv_74 Well-Known Member

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    Well that all depends on the amp and how you wire the coils.

    Figure 1 shows the coils wired in parallel, resulting in a 1ohm load. Figure 2 shows the 2 coils wired in SERIES, which results in a 4ohm load. Every amp will be able to handle a 4ohm load. Less will be able to handle a 1ohm load.

    Remember when you decrease resistance (ohms) you increase power (wattage). Given that it's a stock speaker I wouldnt throw more than 100-150watt RMS at it. A small 2ch amp, bridged, while wiring the 2 voice coils in SERIES is probably your best bet. Be sure to check the RMS rating on the amp at 4ohms if you wire them in series.

    A dual voice coil sub generally sounds better than a single voice coil sub, and they aren't any more difficult to hook up...



    [​IMG]
     
    A Salt Weapon likes this.
  5. Feb 8, 2017 at 10:50 AM
    #5
    SocalTaco15

    SocalTaco15 [OP] Well-Known Member

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    Thanks so much. That helps me out tremendously.
     
  6. Feb 8, 2017 at 11:41 AM
    #6
    jv_74

    jv_74 Well-Known Member

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    No problem - keep us posted how you make out
     
  7. Feb 8, 2017 at 11:44 AM
    #7
    jv_74

    jv_74 Well-Known Member

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    Also worth mentioning - For an easier install (and to save you some $$$) an amp with high-level inputs will work absolutely fine for just a subwoofer. No need for an LOC. That's how I have mine set up. The rear speaker wires are really easy to tap in to. They are both behind the interior trim panels that seperate the front/back seats near the bottom of the seatbelts (C-pillar?)

    If my memory serves correctly red/white driver's side....yellow/black on the pass side.
     
  8. Feb 8, 2017 at 11:54 AM
    #8
    SocalTaco15

    SocalTaco15 [OP] Well-Known Member

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    I'd definitely prefer the high level inputs. Does your amp have a frequency pass to weed out the highs?
     
  9. Feb 8, 2017 at 12:16 PM
    #9
    jv_74

    jv_74 Well-Known Member

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    Yep, low pass filter.
     
  10. Feb 16, 2017 at 10:48 PM
    #10
    SocalTaco15

    SocalTaco15 [OP] Well-Known Member

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  11. Sep 26, 2018 at 10:39 PM
    #11
    Boston2006

    Boston2006 Member

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    Hey how did this ended up sounding? Seems like an awesome plug and play setup!
     
  12. Sep 27, 2018 at 2:02 PM
    #12
    mctechhweng

    mctechhweng Well-Known Member

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  13. Sep 28, 2019 at 5:18 PM
    #13
    SocalTaco15

    SocalTaco15 [OP] Well-Known Member

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    Vehicle:
    15 Prerunner, TRD Off Road, DCSB
    Bilstein 5100's, Heastrong Off-Road HS2 Coils, Wheelers 1-1/2" AAL, FJ Cruiser Wheels, Tail gate clamp, AVS Vent Visors, OEM Roof Rack, Color Matched Grill & Rear Bumper, Undercover Classic Tonneau, JBL sub, and WIndow Tint
    Sounds great. Definitely a good add for el cheapo. The whole set up was $100!
     

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