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    JL 500/1 Input Sensitivity Setting-Low output voltage

    Alright, so I have this JL 500/1, and I just put in a new 8w7 and hooked it all up and it was pretty quiet, so I went to adjust the input sensitivity as described by the manual.

    So I get it all setup, and even with the gain all the way clockwise, while running a 50hz sine tone, I am still only getting around 5.5v on the sub output terminals. It's supposed to be up to 38.7v for a 3 ohm sub.

    I don't know too much about this stuff, so does anybody know is this a problem with the amp/amp settings, or headunit problem, or bad RCA's?

    I'm using an Alpine CDE-126BT headunit.







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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    change your input (high/ low switch)




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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    Quote Originally Posted by princ3cmo View Post
    change your input (high/ low switch)
    I had the 'input voltage switch' set to low, as the manual recommends. I also tried it on high and it makes the voltage even lower.




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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    you did have the DMM on A/C voltage, right?




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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    Yes sir.




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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    double check the xovers on the deck and the amp. make sure theyre on lowpass, not highpass. also check the amp ground and turn up the sub volume on the deck if it has one



    Alpine 9887, Cadence TXA-1502, Oz ME 180CS, Cadence TXA-1000d, 12" RE SE sealed, Second Skin Damp Pro

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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    After some help and more diagnosing, it appears to be a head unit issue. It is not providing enough voltage to the pre-outs. With a 50hz sine wave playing at 80% volume I am only getting around 100mV to the sub outs on the head unit.... I am unsure why, as this head unit is only a few months old.




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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    Well if you do not want to change out your headunit you could use a LOC hooked into the speaker outputs from the headunit




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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    Quote Originally Posted by gsxtasy View Post
    After some help and more diagnosing, it appears to be a head unit issue. It is not providing enough voltage to the pre-outs. With a 50hz sine wave playing at 80% volume I am only getting around 100mV to the sub outs on the head unit.... I am unsure why, as this head unit is only a few months old.
    Some models of h/u's require the bass function to be turned all the way up before the h/u will output advertised signal voltage.



    No speaker, in the history of speakers, has ever been blown by too little power. Ever. I don't care what your friend told you, he's a dirty liar.


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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    There are two subwoofer settings on that head unit that could cause the problem.

    SW ON/OFF should be set to SW ON
    SUBWOOFER Should be set to +15




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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    I had the subwoofer ON, and the subwoofer at +12 when doing this test. I'm almost positive the pre out driver in the headunit got fried from a pinched RCA or something like that.




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    Re: JL 500/1 Input Sensitivity Setting-Low output voltage

    Off topic but how do you like the Alpine CDE-126BT?



    My short lil references from who i bought from.. Tallc, BassAddictJ, lilkman2202, IamMurph, CJ8501, bumpincrv, and mrteacha

    2008 F250 powerstroke. too much performance done, stock stereo.
    2013 Honda Civic, 100% stock inside and out (wifes brand new car)
    2000 Honda Prelude. Son's first car, Sony POS HU, RF Punch 800a2, Alpine type R 10" in vented box tuned to 26hz.

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