I have a 2019 Honda Civic SI with premium sound system- sub woofer advice

  1. FreedomPenguin

    FreedomPenguin New Member

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    #1 FreedomPenguin, Feb 17, 2020
    Last edited: Feb 17, 2020
    I have a 19 honda civic SI coupe, with the premium system and the subwoofer under the seat. What I am wanting to do is add the following paired with an alpine mrv-m500 amp. My concern is, can I grab the bass source from the subwoofer under the seat? I am not against removing or using that signal wire to feed the amp for this aftermarket sub. I have apple CarPlay headunit, and not sure where is best place to tap the signal source.

    I don't really want to use a LC2i line out converter, as id rather have the true source. Let me know all my options! thanks

    https://www.crutchfield.com/p_13693317/JL-Audio-CS212LG-TW1.html

    Also- does this car have active noise cancelation that I have to worry about disabling?
     
  2. SCOPESYS

    SCOPESYS Senior Member

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    #2 SCOPESYS, Feb 17, 2020
    Last edited: Feb 17, 2020
    The issue I see is that the Honda Sub Output from the Premium Sound System, has a High frequency cutoff that is about 1 octave too LOW. Those frequencies in that cut-off active would greatly benefit by being fed to the Sub, --or to your new Sub Amp.

    This is why some choose to add a LC2i, to combine the Sub Output, with a low frequency cuffoff Front side speaker signal, and feed that to the new AMP.

    Instrument-ow-freq.jpg

    Instrument-ow-freq with Lci1.jpg

    sub + LC2I_left_Right.jpg
    If the Low Freq cuttoff of the LCi2 is "Modified/hacked", and raised a little, then an even better range of frequencies can be fed to the new Power Amp (see Below)

    sub + MODDED LC2I_left_Right.jpg

    The above RED Frequency response would be the "IDEAL" one to feed to your new AMP, ( Not the BLUE Honda Sub Output) to gain maximum benefit of better Bass in the Car -- assuming you find and fix all the rattles !!!
     
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    OP
    FreedomPenguin

    FreedomPenguin New Member

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    There is no post in your reply.
     
  4. SCOPESYS

    SCOPESYS Senior Member

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    There is now, -- I hit the SAVE button too early !!
     
  5. josby

    josby Senior Member

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    To add to the above, I think the idea of wanting a "true" source is misguided. For one thing, the DSP inside the factory amp has already modified the signal you'd be tapping into. The other thing is, modern processors like the LC2i are extremely good about adding very little distortion to the signal, and furthermore our ears are not very sensitive to distortion at bass frequencies. It might introduce some effects on phase, I suppose.

    Fortunately no, no ANC to deal with on any Civic.
     
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