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Thread: audio wiring in Mk IV Jetta w/ monsoon

  1. #1
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    audio wiring in Mk IV Jetta w/ monsoon

    Ok, so since I am looking at going total carputer and remove the HU, I was trying to figure out the wiring scheme. This is what I was thinking, remove all stock stereo wiring, and re-wire it. I was planning on also removing the monsoon amp/crossover in the trunk being that I am mounting my box for my 2 10" subs and 2 12" subs in that area behind the rear seat.

    From here, I would install the 1000W amp that I will be powering the subs with. This amp would get it's own RCA connection from the sound card in the computer. or even an RCA splitter if I can't find a soundcard w/ 2 RCA-out.

    The other RCA connection would go to a new 4 channel amp for the 8 interior speakers. This is where I get a little stumped. My problem is that I am not sure how to crossover after the signal splits at each of the 4 doors. I would like to install some sort of high-pass crossover on the line that splits going to the tweeders in each door.

    Example: the wire for the front-left door. I would use 1 signal wire that would be spliced. one splice going to the 2-way speaker in the bottom of the door, the other splice going to the tweeder near the window.

    I can not figure out how to cut the mid-range sound out and only allow the high-range signal to get to the tweeders, but allow the mid-range and highs to reach the 2-way speakers.

    Does anyone have any idea how to do this or am I making this FAR too difficult?

    Thanks
    Joe

  2. #2
    Top Ramen lgbr's Avatar
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    Code:
    Speaker wire ---------- Crossover -----(mid) ------ Midbass woofer
                      |                | (high)
            2 Way Speaker          Tweeter
    If I understood you correctly, that's it?


    http://www.autosecurity.ru/audio/spe.../crossover.jpg

    That's what a typical crossover looks like. Some are just Tweeter & Woofer.

    Problem is you'll need 4, and they can get pricey.
    Audio Rockford Fosgate: 900 Watt 4-channel amp, 501bd Mono amp
    Computer AMD 2400+ XP, 1 GB DDR RAM, Orbit Micro 250W DC-DC PSU

    Head units are for cheaters!
    sure some girls fake orgasms.....but it's guys like me who fake the whole relationship

  3. #3
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    Just how much do these run on avg? I figured it would be kinda pricey but are we talking like $75-100 each or like $200-300 each? Would be kinda nice if i could just find an 8-Channel amp w/ a crossover built in for each line-out, but I am just not that lucky.

  4. #4
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    it might even be easier and cheaper to do 2 4-channel amps split off the same RCA line-out with one of them going for just the tweeters and one going for just the 2-ways... though I would probably need to buy better tweeders and better 2-ways as well

  5. #5
    FLAC ppgt94's Avatar
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    Cool My install

    Quote Originally Posted by HeX111
    it might even be easier and cheaper to do 2 4-channel amps split off the same RCA line-out with one of them going for just the tweeters and one going for just the 2-ways... though I would probably need to buy better tweeders and better 2-ways as well
    I have (had - ripped the POS out) monsoon system in my MKIV Jetta. I used a 4 channel amp to power all 8 speakers. It took a hella long time to trace and re-wire all the leads! I spent about 4-5 hours just soldering (but I suck at soldering). Do you have a moonsoon "box" in the back?

  6. #6
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    yeah, I have the little black monsoon box/amp/crossover in my trunk, that will be going to about the same place the rest of that deck is going, the trash after I use the deck as a template for the top frame of my box...

  7. #7
    FLAC ppgt94's Avatar
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    I'm sick of my soldered wires. I would like to extend the wires. Is there a wiring harness that plugs into the back where the monsoon black box plugged into?

  8. #8
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    Is there a reason you wish to rewire the car? I cant imagine replacing all that wire! I cant imagine there being any benefit worth doing such a thing! the resistance of the stock wiring is such that larger wire really isnt gonna do anything for you! Find one person who burned their wire with aftermarket equipment.... noone is stupid enough to run 350 rms through the stock wiring unless its a very very short distance, and if anyone burned using less power, find out how shoddy their wiring was, it was probbaly a short!

    two tens, two twelves, and eight midranges. wow, you've got alot going on in your car! But isnt it a little overkill? It seems to me that by adding so many speakers, the resonance issues multiple source points could actually damage your quality of sound more than help it!

    I would reccommend a different path. Two tens, two twelves, eight speakers, with or without tweeters, amplification to power it all, including sub-bass drivers. thats ALOT of money! not to mention all teh money you were just willing to spend on rewiring your whole car... let me suggest something different!

    sink all that money, all of it into just a pair of component speakers, a pair or three of identical subwoofers, and enough power for it all. Think about it! if you bought $100 speakers, times eight, That means youd have a budget of eight HUNDRED dollars to sink into a component set! talk about a potentially good set!

    With that kind of money into a set, wisely chosen to suit your music desires, you will get all the volume capability that your idea with two tens, two twelves, and eight speakers-with or without tweeters would be capable of. Furthermore, you will not have the same imaging problems of multiple point sources, you wont have cancellation issues tdue to phasing of different drivers, you wont have to worry about setting crossover points for EVERY driver in the car.. its just win/win!

    Same idea with subbass, but even more severe of a benefit, from a volume/phasing point of view. different subwoofers (even of hte same size, but especially of different sizes) powered by the same amplifier (and thus the same crossover settings) is going to have ALL SORTS of phase issues! ever hear what a 60 Hz sinkhole in frequency response sounds like? you might, if you put all that in yoru car! most definitely you will find your quality of sound in the accoustical transparrency department suffers immensly.

    so why 8 speakers to begin with? its all a ploy from the car companies, to sell cars! two speakers is good? well, four has to be better, right? how about 6? 8? 12? if its got more speakers, its gotta be way better! Well.... maybe not always the case.... Definitely not in a musical scenario, where all signals are recorded in TWO channels! ... left.... right.... front and rear never even play into it! much less... rear high? rear surround? front upper? front lower? I can't imagine what they even title the speaker locations!

    in the end, it will be all up to you. maybe you can somehow defeat the phasing issues you are going to have with so many speakers. certainly you will NEED a second amplifier to power your different sized subwoofers in order to eliminate potential phase issues. most definitely. Some people just prefer to have teh sound stage sit at a single point inside their head, to eliminate environment entirely from quality of sound. If you are like that, thats cool, maybe you should indeed consider cramming a speaker in every location VW gave you. maybe even add a couple more, in kick panel areas etc!

    But I cant reccommend enough how I personally beleive you willg et the highest benefit from sinking such a large amount of cash into few speakers to achieve a greater environmental sound, more accoustical transparrency, maybe even able to image an instrumental location or two.

  9. #9
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    for more complete information, rather than this glazing over, I would reccomend checking out christopher everts site, He is an excelent writer, and very well educated and experienced in his field of study

    http://www.betteraudio.com/geolemon/Phasing/Phasing.htm

    a link on absolute phasing and its affect on sound quality

  10. #10
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    What would I need in order to do away with the head unit (like HeX111 did) and then use my carputer to play MP3s through my factory speakers?

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