What do you think of my new trunk idea?

Discussion in 'OT Technology' started by MaximaDrvr, Oct 24, 2007.

  1. MaximaDrvr

    MaximaDrvr Member

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    So, I have been running an all JL system. My 12w7 died after 2 years, and I am changing brands, for the most part.
    The source is an Alpine IWA-W200. I have A/D/S 346cs up front, Elemental Design 6.5'' in kicks, and Alpine Type R coax in the rear panels.
    I plan to change from my JL amps to the Memphis 1000/4.

    I drive an 03 GTI. (hatchback for those who don't know)
    I've done a rear seat delete, so there is a ton of open room in the car. I am looking at doing essentially 2 steups in one.

    1. I'm looking at doing 2 Memphis M3 Mojo 15'' subs with either a Memphis 2500 or a Memphis 4kw. The box will be a 6 cu.ft ported enclosure tuned between 28 and 32 hz.

    2. In a box inside the box above, there would be a .9 cu.ft. sealed box housing a 8w7 running off of a 250/1.

    The purpose of this is to have a nice well rounded system for DD, and then stupid, rediculous loud at the flip of a switch.

    Thoughts, opinions? The whole setup would run me a little under $2k.
     
  2. JRock10

    JRock10 Active Member

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    sounds pretty cool. that should be loud as hell.
     
  3. veonake

    veonake OnT poster, OT lurker

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    Why not just turn down the bass when you want to? Or have a switch to run just one 15?
     
  4. MaximaDrvr

    MaximaDrvr Member

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    I use this as a show vehicle, and as a demo vehicle for my company.
    I like to use extremes. My estimated 157db is up there.

    as for turning down the bass, I don't think I will be able to turn the 15''s down enough to balance. I don't listen to my music very loud normally.
     
  5. veonake

    veonake OnT poster, OT lurker

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    You would just need a more powerful attenuator. There's no reason you shouldn't be able to turn them down to balance with the proper attenuator if you really wanted to. Anyway, if it's a show car, then I guess I can see why you would want to do the odd setup you're suggesting.
     
  6. phyphoestilic

    phyphoestilic New Member

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    The W8 would be in a very poorly designed 4th order Bandpass box (1/2 sealed 1/2 ported enclosure) It'd probably sound like crap.

    It'd be alot easier to get a HU with a EQ system that has different settings so u could switch between a balanced frequencies setting and a Max SPL setting.
     
  7. MaximaDrvr

    MaximaDrvr Member

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    The 8w7 would be in a fully sealed box, not bandpass. The sub would be visible, and a sealed enclosure behind it.
     
  8. Kieffer87

    Kieffer87 Orly OT Supporter

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    I don't see why this wouldn't work :dunno:
     
  9. MaximaDrvr

    MaximaDrvr Member

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    So, the car was broken into and the IWA-W200 was stolen.
    I've been dealing with that most recently.

    I roughly finished the box today. I haven't worked out any of the trim panels yet.

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]

    The holes in the middle were where I was going to put my ports (3'' diam), but realized they wouldn't fit, after I drilled a hole for each one. Used a dowel and glue to fill each hole. It is solid now. The box came to 5 cu.ft for the 15''s and .8 cu.ft for the 8''. That accounts for internal bracing, but not the sub displacement. I will need to rework port length before I put them in. I also haven't put any finished edges on the box. I could have gotten the 6 cu.ft if I had taken the box all the way to the back of the trunk, but then I couldn't have gotten the box in the car with the c-pillar bar in.
    The box's trim panels will be wrapped in red and black micro suede.

    My ideas keep growing, and getting more expensive. What I am now thinking. /still memphis
    MCD2500- 2500W RMS
    15 M3 Mojo x2
    MCD5004- 125x4 RMS
    Big Belle 1600- 75x4 RMS + 450 RMS sub
    JL 8w7
    Yes, three amps, Two channels for subs, 8 for mids, highs, fills :eek:
    I welcome all thoughts and comments.
     
  10. JRock10

    JRock10 Active Member

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    build the port on top of the box. slot it at the back on top (above the 8) and then build the port chamber on top of the box. that'd be pretty wicked
     
  11. MaximaDrvr

    MaximaDrvr Member

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    Well, I picked up the subs today.
    Memphis M3 Mojo 15'' x2
    A quarter on the surround.
    [​IMG]
    A fifth of Jager for comparison.
    [​IMG]
    [​IMG]

    Decided to drive them with a pair of Memphis Big Belles.
    Fronts are going to be Hertz MLK-165 components.
    HU is Kenwood Excelon 8019
     
  12. rebs

    rebs shares AIDS OT Supporter

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    who the in the fuck taught you to design an angled box?

    fire them..LOL


    srsly if you need pointers PM me :mamoru:
     
  13. rebs

    rebs shares AIDS OT Supporter

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    also, a box like that NEEDS bracing.
     
  14. JRock10

    JRock10 Active Member

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    :eek3: no shit, i didn't even look at that.
     
  15. MaximaDrvr

    MaximaDrvr Member

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    It isn't nearly done yet. I still have most of the internal bracing to do, plus about a gallon or two of resin.
    Plus, there is another layer or 3/4 or 1/2 MDF that is going on 4 of the faces. I beleive that adds a bit if rigidity.
     
    Last edited: Jan 7, 2008
  16. rebs

    rebs shares AIDS OT Supporter

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    seriously though, theres a much nicer way to construct that box..if youd like help, pm me:bigthumb:
     
  17. deusexaethera

    deusexaethera OT Supporter

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    Don't port the damn box. Subs that big need air pressure to control their movement so they don't distort the sound.

    Anyway, why are you aiming the subs at the back of the seat instead of up into the cabin?
     
  18. rebs

    rebs shares AIDS OT Supporter

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    LOL..
     
  19. XR250rdr

    XR250rdr OT Supporter

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    :werd:
     
  20. deusexaethera

    deusexaethera OT Supporter

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    Sealed subs always sound better than ported subs. The only reason to port a sub is to get more volume for less money. Which doesn't make much sense considering he has the speakers aimed at cloth-and-foam seats that will block probably 25% of the sound, if not more.
     
  21. MaximaDrvr

    MaximaDrvr Member

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    There are not going to be any seats.
    I'm doing a rear seat delete, and the air ride 5 gal (vehicle colormatched) will be sitting there. There will be FG work to make the transition look pretty.
     
  22. deusexaethera

    deusexaethera OT Supporter

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    Ah.
     
  23. kwhitelaw

    kwhitelaw OT Supporter

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    wat
     
  24. kwhitelaw

    kwhitelaw OT Supporter

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    if you are thinking you need a gallon or 2 of resin, you are wasting your money.

    rebuild the box with 1". actually build the angles properly so everything meets up. factor in for a couple 2x4's for bracing and if you really feel the need, lay down some glass in the inside.

    and get a jasper and recut those holes.
     
  25. JRock10

    JRock10 Active Member

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    :hsugh:

    apparently somewhere along the lines we missed the fact that he's using
    15" fucking subs. sound quality has been thrown out the fucking window long ago. port the goddamned box and smash out, nigga!
     

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