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Thread: embarrassed to ask: subwoofer wiring?

  1. #1
    Variable Bitrate telekineticfool's Avatar
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    Mar 2003

    embarrassed to ask: subwoofer wiring?

    Hey guys, I'm embarrassed to have to ask this, but a friend of mine wants help installing a subwoofer in her jeep.

    I know how to do most of it, but how would you go about wiring it to a stock radio that has no subwoofer out?

    I wired my carputer and my subwoofer, but my HU has sub-out, so I can do all of the rest of the wiring just fine once I figure out where to pick up a signal from.

    Thanks guys!

    PS. I tried to and for a few minutes before I posted. If anyone can slip me some better google keywords I'll happily try some more.
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  2. #2
    FLA gospeed.racer's Avatar
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    Dec 2003
    Portland, OR
    Umm...I am thinking high to low level converter to make Rca out of a stock deck.....then an Amp...then the subs. Or maybe a cheap amp that has high level inputs. Best go to the local stereo shop and ask them what they use to do the same, they may have a cheap answer.
    on this page, look at the second pic down..that is an exapmle of a low level convertor....from this you will do the install just like your car pc
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  3. #3
    Maximum Bitrate allenruble's Avatar
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    Jun 2001
    Does the jeep have seperate amp from the head unit ? This how I do it for new car owener's that won't to keep their stock head unit . If it doesn't have seperate amp you can just find the wires that goto the rear speaker's and splice in to the wires . I have seen this in a car audio were they just put rca cable ends on the end of the wire plug right in to the amp and turn down gain . I have tried this and works good.

    I did a google search with (amp to stock headunit ) (amp to stock head unit)

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  4. #4
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    Apr 2004
    Champaign, IL


    I used one of these when I needed to do that in my old truck

  5. #5
    Constant Bitrate ashbosh's Avatar
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    Mar 2004
    Although all of the above info is correct, I'd recommend you buy a mono or dual channel amp to drive the subwoofer. Ain't no fun using sub without amp.
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  6. #6
    Maximum Bitrate sfay93's Avatar
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    Feb 2004
    Omaha, NE
    Like gospeed said, use the high level to low level converter then just run RCAs to your amp or buy a cheap amp that has high level inputs. I would also make sure that the amp has a built in crossover because it will sound pretty terrible with you mids and highs coming out of it.
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  7. #7
    Whistle Tip pimpJ's Avatar
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    Apr 2004
    Metro, TX
    yah, my friend tried this without a crossover and it sucked horribly. Make sure U get that

  8. #8
    Join Date
    Apr 2004
    Blackpool, UK
    if the headunits got rca output (check for phono sockets on the back of it) then run a rca lead between the headunit and youll need to invest in a amp (make sure its got a low pass filter on it), enable the low pass filter on the amp - youll want it set to about 85hz - and hook the subwoofer to the amp. this should do you, if your head unit doesnt have rca output then youll need either a high level -> low level converter or an amp with high level inputs. either way just hook into one of your speaker outputs (say front left) and run them to either the high level -> low level converter or the high level inputs on the amp (depending which way you do it). again make sure the amp has a low pass filter on it, and enable this and set it to 85hz. then hook the subwoofer up to the amp output, and your away! most head units wont have a subwoofer out because it takes a hell of a lot of power to drive a large subwoofer (in my car ive got a 900 watt peek amp just for the subwoofer) - my head unit was 4x 45w, so no where near enough power!

    hope this helps,

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  9. #9
    Constant Bitrate
    Join Date
    Apr 2004
    Dallas (Grapevine)
    agreeing with previous poster... electronic crossover is a must. It may cost a bit, but when you hear the difference you will be amazed. Plus, you can get by with a lesser amp and subwoofer since your stripping out the unintended sounds from the signal.

    And skip the passive crossovers. They barely work.

    When I was younger and poorer I bought a $80 electronic crossover that took speaker level in from both a left and right channel, combined it to a single channel sub output (important too, unless you just want to hear the bass from the left channel only) and a pair of high/middle out, all at line level.

    Made my $40 amps and $150 sub sound about ten times better. I was about to throw it all out until I tried this. Got rid of all the distortion, since the mid/high speakers no longer had all that bass overloading them, and the sub only had to play what it was built for - low notes. Good luck!

  10. #10
    Constant Bitrate
    Join Date
    Mar 2004
    Los Angles
    use the high level in on the amp if it has one it will sound better and cost less

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