Headunit dims when loud volume

Discussion in 'OT Technology' started by Snowman, Feb 16, 2006.

  1. Snowman

    Snowman I know the Benzes. OT Supporter

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    Just installed Alpine CDA-9856 in stock audio for 2001 Civic. I've noticed when the volume is up the backlight of the headunit dims with the beat.

    Is this normal? This happens in one of my friends cars too.
     
  2. dorkultra

    dorkultra OT's resident crohns dude OT Supporter

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    yeah, you should put a small capacitor on the power line.
    also, get a better car battery and alternator. if you have sub, get a decent capacitor and place it close to the amp
     
  3. Snowman

    Snowman I know the Benzes. OT Supporter

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    Everything else is stock on the car. I'll look into that. Any kind of specific capacitor?
     
  4. Ronin

    Ronin Guest

    get a car battery/alternator before you waste money on a stupid capacitator
     
  5. Scout

    Scout OT Supporter

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    Capacitors don't do shit. Get a better alternator.
     
  6. nickgonzo

    nickgonzo oh ya

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    truth ^
     
  7. XR250rdr

    XR250rdr OT Supporter

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    Some head units just do that, even powering only stock speakers.
     
  8. Snowman

    Snowman I know the Benzes. OT Supporter

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    Could something get damaged? Or is it more of an annoyance?
     
  9. XR250rdr

    XR250rdr OT Supporter

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    Just an annoyance.
     
  10. shiba

    shiba Active Member

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    ok if everything else is stock then it might be something with the head unit. ask the company if it is suppose to do that and if it isn't then have a look at the wiring. You DO NOT need a new battery or alternator or capacitor unless you have done some major audio upgrades.
     
  11. JRock10

    JRock10 Active Member

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    run your 12v constant (yellow) to the main ignition harness, and chassis ground the ground (black) wire. Sometimes the small gauge wires in the factory harness don't carry enough current to power the radio fully. so going to the main harness you'll be connecting to a larger gauge wire.
     
  12. Fusion

    Fusion OTSS FTW OT Supporter

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    Capcitors are awaste of money.........

    Google "big three" and do that. This is a cheap ($10) and easy way to improve your cars electrical system with out spending much
     
  13. Snowman

    Snowman I know the Benzes. OT Supporter

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    Ahh I see. I just connected them straight to the harness adapter I got rather than going straight to the wires.
     
  14. XR250rdr

    XR250rdr OT Supporter

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    Good point, almost forgot Alpine used to say a direct connnection was required for most of their head units.

    For just a new head unit, Big 3 is not worth the effort. Caps are a waste of money though.
     
  15. Mojo

    Mojo New Member

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    heres a good read if you think capacitors arent a good investment: http://www.betteraudio.com/geolemon/newmain/battcapalt/

    as for dimming with just an headunit, dont worry about it. i have the same vehicle and been having that prob for 2-3 years now. its just annoying. if you were running an external amp and sub, then maybe a capacitor could be neccesary

    sounddomain.com has an offical big-3 sticky thread
     
  16. Ronin

    Ronin Guest

    your link does not sway me either way.

    1)it doesnt say how slow the battery is to respond nor does it explain why it is to slow to respond

    2)It doesnt explain when and how these uber huge amp draws are pulled, it should explain this instead of saying "a uber bass note comes and ur ampz explodes lolz

    3)That post is by someone who obviously worships caps and therefore knows nothing and will say anything to make people believe the same as him, he is probably 14 and highly nerdy.

    4)If capacitors are the "only fix" as made to seem by this article then why do so many other people, including car audio installers, not use them and not have problems regarding their system integrity?
     

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