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Reload Thread: Subwoofers not working ugh!

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    sundown-4-life's Avatar
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    Subwoofers not working ugh!

    Car Setup
    2 Sundown SA-8 D2 (each wired to 2 ohms)
    Kenwood KAC-9105D 1800 watt amp w/ 4 gauge wiring kit
    Alpine CDE 121 HU

    Here is my issue.
    Amp shows it is receiving power but the subs are not on. I know this could be many different issues, but I believe this is a loose RCA cable in the headunit. I checked the ground and there are not loose wires, the gain is properly set and the subs are not fried (aka blown voice coil). Is this a proper assumption to make? Also I am aware that the factory RMS is 500 watts but I am also under the impression that these subs were built for abuse. How many watts above the RMS value would it be safe to go?







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    Freeman's Avatar
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    Re: Subwoofers not working ugh!

    Quote Originally Posted by sundown-4-life View Post
    Car Setup
    2 Sundown SA-8 D2 (each wired to 2 ohms)
    Kenwood KAC-9105D 1800 watt amp w/ 4 gauge wiring kit
    Alpine CDE 121 HU

    Here is my issue.
    Amp shows it is receiving power but the subs are not on. I know this could be many different issues, but I believe this is a loose RCA cable in the headunit. I checked the ground and there are not loose wires, the gain is properly set and the subs are not fried (aka blown voice coil). Is this a proper assumption to make? Also I am aware that the factory RMS is 500 watts but I am also under the impression that these subs were built for abuse. How many watts above the RMS value would it be safe to go?
    Are they wired correctly?




    1986 Nissan hardbody
    Hu:Kenwood Kmm-100u
    front:1 Cheep Kenwood speaker.
    Rear:the 3in of room behind my seat where my amp sits
    Sub:soon
    Amp:polk pa330
    Wiring:1/0 knu kca to 4gauge distribution block and 1/0 kca big 3

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    Freeman's Avatar
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    Re: Subwoofers not working ugh!





    1986 Nissan hardbody
    Hu:Kenwood Kmm-100u
    front:1 Cheep Kenwood speaker.
    Rear:the 3in of room behind my seat where my amp sits
    Sub:soon
    Amp:polk pa330
    Wiring:1/0 knu kca to 4gauge distribution block and 1/0 kca big 3

  4. #4
    sundown-4-life's Avatar
    sundown-4-life is offline Junior Member

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    Re: Subwoofers not working ugh!

    Yes i just went out to my car and checked everything. The subs are wired properly and the rca cable seems to be firmly in place. Do you think it may be internally within the HU?




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    Freeman's Avatar
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    Re: Subwoofers not working ugh!

    hmmm




    1986 Nissan hardbody
    Hu:Kenwood Kmm-100u
    front:1 Cheep Kenwood speaker.
    Rear:the 3in of room behind my seat where my amp sits
    Sub:soon
    Amp:polk pa330
    Wiring:1/0 knu kca to 4gauge distribution block and 1/0 kca big 3

  6. #6
    garychoffmann's Avatar
    garychoffmann is online now CarAudio.com Elite



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    Re: Subwoofers not working ugh!

    Each sub can only be wired to 1 or 4 ohm. How do you have them wired? Are you sure the amp is seeing a final 2 ohm load?




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    juanmgarza26's Avatar
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    Re: Subwoofers not working ugh!

    Ur amp powers on?



    **Build in progress**
    Electrical: Mechman 270 alt, Sky High Audio 1/0 CCA, Optima under the hood, Crescendo in the rear
    Amps: SQ 3500D and Q4-120
    Subs: 2 SQ HDC3.0 15's in a 1/4 wave T-line at 35hz
    Speakers: 2 sets of QC-HF6.5
    Vehicle:White 1997 Ford F-150 Extended Cab

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    Joseph M's Avatar
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    Re: Subwoofers not working ugh!

    so much fail.... you said '1800 wats/4gauge' probably melted your power wire.

    Please tell me your a women?




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    skylineTT's Avatar
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    Re: Subwoofers not working ugh!

    some head units have a Subwoofer On/Off feature so check that. Otherwise it sounds like an RCA issue at the head unit or improper sub wiring



    Refs: Dipitydoo, appollyon, bad95gt, revrider1, jwh1598, ampjunkielikeme, deathpenalty18, ssackett, snoopysnooper, corey0928, SPLAudio, Clifff150, CL1CKCLACK, ShawnT, West + more

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    Re: Subwoofers not working ugh!

    Try the battery test first, place a double A battery on the speaker leads from the amp and listen if it makes subs any kind of sound, if it doesn't you have a break along the speaker wire or your subs are blown.




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    Re: Subwoofers not working ugh!

    Quote Originally Posted by skylineTT View Post
    some head units have a Subwoofer On/Off feature so check that. Otherwise it sounds like an RCA issue at the head unit or improper sub wiring
    This...

    and d2 subs can not be wired to 2 ohms each....only 1 or 4 ohms.....



    Silently stalking you through glass....

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    skylineTT's Avatar
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    Re: Subwoofers not working ugh!

    Yeah, so you're probably getting either a half ohm load or 2. Maybe the amp wont run if it sees a low impedance.



    Refs: Dipitydoo, appollyon, bad95gt, revrider1, jwh1598, ampjunkielikeme, deathpenalty18, ssackett, snoopysnooper, corey0928, SPLAudio, Clifff150, CL1CKCLACK, ShawnT, West + more

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    Beatin''s Avatar
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    Re: Subwoofers not working ugh!

    that kenwood is rated 900wrms at 2 and 1 ohm. 4ga wire is good enough if the wire is actually 4 gauge.



    All day I'm clippin'
    voltage be dippin'
    I don't give a damn,
    cause my trunk always hittin'!

    creating a proper sound wave. Step one, turn it up until clipping. Step two, done.

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