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  1. #1
    jellyfish420's Avatar
    jellyfish420 is offline i design boxes .......



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    3hp in a trunk question

    well i just got my 3hp motor in today. i'll be sending it off for a recone in the next week or two, and i wanna get started on the box so when it gets back i can have everything ready to thow it in. i have 2 questions....

    1) *personal experiance only* what is the best way to fire in a trunk car? i've always been a fan of sub/port back...but i've heard a few people say sub up port back. i don't know about this, so i wanna hear some opinions. (and i can't rip the back seat out, i have 3 kids)

    2) i will have no t/s specs as this will be a custom driver, so i would like some opinions on box size/tuning. i've never had a driver of this magnitude, but i was gonna guess at around 4ft @ 38Hz.

    car is a 94 grand prix 4dr and the 3hp is a 15.



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  2. #2
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    Re: 3hp in a trunk question

    I was told overwehlmingly that Sub Up is NOT the way to go in a trunk.. and was reccomended sub/port fire forward into cabin if possible...or sub/port towards rear taillights.. make sure there is a lil room over the top of the box when rearfiring so you dont seal your soundwaves off (read that last part on audioque.com)




  3. #3
    jellyfish420's Avatar
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    Re: 3hp in a trunk question

    Quote Originally Posted by RipDaJacka View Post
    I was told overwehlmingly that Sub Up is NOT the way to go in a trunk.. and was reccomended sub/port fire forward into cabin if possible...or sub/port towards rear taillights.. make sure there is a lil room over the top of the box when rearfiring so you dont seal your soundwaves off (read that last part on audioque.com)
    right now i have sub/port up, and don't get me wrong its loud, but i think an 18 off 1000w is gonna be loud anyway i go. but w/ the 18 thats the only way i can go. other than that, i've ALWAY done sub/port back...but if there's a better way, by all means im game.



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    Re: 3hp in a trunk question

    Man, I had the same post like 2 days ago wanting to run a 3518 in my trunk, in EXACTLY the same situation of sub up, port front or back.. I just decided to run a smaller size, but if you have the sub already just go subs up... or Angle it as much as possible




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    Re: 3hp in a trunk question

    Sub and Port back is the way to go for your particular car.

    Sub up Port back works ok if you absolutely have to due to space issues.

    Sub and Port into the cabin is ideal but only if you have the trunk 100% completely sealed off from the cabin. Even if you build the box within a few inches of the width of the trunk, if the trunk is able to have air flow into it you will notice that you lose a lot of SPL in the low low notes and you have a very steep roll-off after a certain point. (around 50hz for me)

    this is from experience



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    Re: 3hp in a trunk question

    I've always had sub/port back in my maxima, but haven't run anything larger than a 12". I would love to seal off my trunk, but my backseat doesn't fold down.



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    Re: 3hp in a trunk question

    i have a hatch, i was told sub fired rear and port forward



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    jellyfish420's Avatar
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    Re: 3hp in a trunk question

    Quote Originally Posted by innsanes View Post
    i have a hatch, i was told sub fired rear and port forward
    in my hatch the best way....well was my wall but the second best way was sub and port back. i had them about 3" away from the back wall was the loudest.



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    Re: 3hp in a trunk question

    jellyfish, i had sub back port to the side with my 3hp, and i loved it

    its my first build thread here, with the flare.




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