Question about Jl Audio 300/4 Car Audio Amplifier

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Hey quick question on JL 300/4V2 impedience light

My light comes on at extended listening levels. Is this normal? It dosent stay lit solid but acts more like a peak or threshold light. Dont know much about the light at this end. I understand loads and impedience but not the silly light
Thanks

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  • Joe
    Joe Apr 02, 2008

    In theroy how much does the load of the speakers change when you are making them work with a powerful amp for an extended peripod.  As we all know resistances change with heat. but enough to make the light blink to the hard hitting bass notes? 


    ZZedly thanks for the reply as I will get my trust meter out and follow the manual 

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If you're referring to the orange "Low ohm" light, it's most likely caused by the amp detecting a "lower than optimum" impedance for it's gain setting. The quick answer is you'll probably have to go through the steps outlined in Appendix A of the owner's manual. This will set the amp gain and input voltage setting properly for your speaker and head unit setup.

Posted on Mar 31, 2008

  • Tygh Duval
    Tygh Duval Apr 02, 2008

    It may have less to do with the impedance of the speaker changing and more to do with the voltage level coming from the head unit. As you turn the volume up, the preamp voltage goes up. At loud volumes, the bass hits are going to be the highest voltage of them all. Appendix A should adjust the amp so that it'll be set for them.

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