User Tag List

Closed Thread
Results 1 to 12 of 12

Reload Thread: ported trunk not box..?

  1. #1
    entropie's Avatar
    entropie is offline stop talking and listen..



    Join Date
    Dec 2006
    Location
    Metro Detroit
    Posts
    38
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    ported trunk not box..?

    i was wondering if this concept was even viable. imagine a small (1.0 ft) sealed fiberglass enclosure tucked in the rear corner of a trunk. the majority of bass waves are trapped in the trunk and only find passage to the cabin through small openings in the rear deck.

    question: is there a way to design ports for those openings to facilitate the passage of bass waves through them? basically, i think it's like designing a single reflex bandpass enclosure.





    thoughts or comments?



    entropie

    patrick
    04/95 BMW M3
    ~Nakamichi cd-500~ ~DLS UP6~ ~Alumapro BP-10~ ~A/D/S/ PH30.2~




  2. #2
    dman4486's Avatar
    dman4486 is offline Paid to Post



    Join Date
    Jan 2008
    Location
    Central, SC
    Posts
    9,321
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    sounds like a PITA!



    Auto: 96 honda passport 3.2L v6 4X4 5sp
    Big 3 pics--THE MAV--THE RSD's--MY VLX
    Rices Creek Pics

    Refs: Sold to; lilmaniac2, alexdbest2000, jshak07 Bought from; CJL

  3. #3
    Hecta G's Avatar
    Hecta G is offline Member



    Join Date
    Jan 2008
    Location
    ATL, GA
    Posts
    71
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    sounds exactly what i was trying to do in mine but turned out to be a royal pain. My guess, from your description the port would lead into your trunk?

    I can tell you what I was going to before I figured out that my trunk would not be as usable as I wanted.

    My intension was (now this is where the pros and the season veterans are going to think I am off my rocker), after figuring out port length, i was going to use those straight cylinder type of balloons and other materials to mock up a path or a "tunnel" in which the air mass would travel from somewhere inside the trunk to the cabin of the car. Once a had a good path i was going to start fiberglassing.

    I was prepared for the worst but I thought it would just take me too long and with wife and kids......aaaagh the drama....



    System: HeadUnit - Kenwood X591
    Front - MB Quart ESA 216
    Rear - Pyle PLG6C (yeah yeah, wife bought them)
    Sub - JBL GT102D
    Box - Dunno, still thinking and designing, will have pictures or CAD renderings.
    Amp - HiFonics BXi 606

  4. #4
    Hecta G's Avatar
    Hecta G is offline Member



    Join Date
    Jan 2008
    Location
    ATL, GA
    Posts
    71
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    after reading your thread again it hit me, you are wanting to use the trunk as the ported enclosure???

    If so, that's not what I was thinking about. In that case you'd have to be sure that your trunk was truly air-tight minus the port of course since you want all the air to exit the port not some crack in the trunk.



    System: HeadUnit - Kenwood X591
    Front - MB Quart ESA 216
    Rear - Pyle PLG6C (yeah yeah, wife bought them)
    Sub - JBL GT102D
    Box - Dunno, still thinking and designing, will have pictures or CAD renderings.
    Amp - HiFonics BXi 606

  5. #5
    entropie's Avatar
    entropie is offline stop talking and listen..

    Threadstarter


    Join Date
    Dec 2006
    Location
    Metro Detroit
    Posts
    38
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    Quote Originally Posted by Hecta G View Post
    after reading your thread again it hit me, you are wanting to use the trunk as the ported enclosure???

    If so, that's not what I was thinking about. In that case you'd have to be sure that your trunk was truly air-tight minus the port of course since you want all the air to exit the port not some crack in the trunk.

    yep. basically the way i figure it is the trunk is essentially the second chamber of the enclosure. based on reading this pdf file, "as the ported chamber increases in internal volume the system becomes more efficient." however, as that happens "the bandwidth becomes thinner."

    with my car, a '95 bmw m3, the trunk is very tight and i believe my alumapro bp-10 suffers from the "one note" bass mentioned in the pdf file. now, i understand to gain the exact appropriate port length would be impossible due to the fact the trunk is not sealed blah, blah... but my question is: does anyone believe the use of ports hanging from the rear deck (possibly tappered ones) would improve the range of bass.

    fyi, with the seats down, the bass notes take on a new persona. with the seats up the bass gets greatly silenced.



    entropie

    patrick
    04/95 BMW M3
    ~Nakamichi cd-500~ ~DLS UP6~ ~Alumapro BP-10~ ~A/D/S/ PH30.2~

  6. #6
    bass maniak's Avatar
    bass maniak is offline Team Poundin Sound



    Join Date
    Aug 2002
    Location
    Faust, Alberta ( CANADA )
    Age
    26
    Posts
    3,182
    Post Thanks / Like
    Images
    113
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    Be a ***** to figure out the volume of the trunk to port it correctly at the freq you want......



    Chuch AKA Tha Mad Scientist

    Team Poundin Sound
    Joker Kustoms
    Boost Junkie Motor Sports
    Street Poetry Productions
    Wreaking Havoc Records

  7. #7
    mile098's Avatar
    mile098 is offline ohhh noeeeesss



    Join Date
    Jul 2007
    Location
    dubrovnik, CROATIA
    Posts
    876
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    ^^x2 and ud have to find a sub that is suitable for the space in your trunk minus the sealed enclosure...and sealing off the trunk is sort of a mission impossible...probably doable, but IMHO not worth the effort put into it



    HU: kenwood 7534 uy
    front stage: Phase evolution cfs 165
    amp 1: Macaudio fearless 2000
    sub stage:Hifonics Zeus 12z4
    amp 2: rockford fosgate bd 1000.1

  8. #8
    theothermike's Avatar
    theothermike is offline I HAVE NO LIFE, CA = LIFE



    Join Date
    May 2006
    Location
    Tampa
    Posts
    1,557
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    here what i think you could do.it sounds like a form of IB to me.

    1 board hold sub. the baffle board in an ib setup. the front board then directs the waves through rear deck. and the port is on the rear deck.

    seems like ib to me.



    System:
    Fronts:ID Oem's & TBI Hdss Front Amps: Sundown Sax 100.2 & 100.4
    Subwoofer: 2x 12" Fi X D4s Sub Amps: Sundown Saz 1500D
    Headunit: Alpine CDA-9887 Batteries / Alternator: Powermaster / Mechman
    Deadener: Raamat BXT Ensolite Alarm: Clifford 50.5x
    References:
    -Premieraudio-Sundownz-Iamamp3pimp-Kpr10is-Jmanpc- MemphisLove-Greekpower-The 727 Kid-Gixxer9-Mobieous-Audiobahnuser18-Thewes-Steveyhustle-Gymfreak101-go_go_thrash

  9. #9
    Join Date
    May 2007
    Location
    South Central PA
    Posts
    304
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    Plus if you put anything large in the trunk, the volume of the ported part would change, as well as the tuning.



    PG RSD65cs comps
    JL 13W3v3
    Hifonics Bxi 1206
    Refs
    Bought from: LazyRider
    Sold to: sku
    Quote Originally Posted by eharri3 View Post
    What aspect of the music exactly would you like your car's rear window and roof to hear more clearly?

  10. #10
    entropie's Avatar
    entropie is offline stop talking and listen..

    Threadstarter


    Join Date
    Dec 2006
    Location
    Metro Detroit
    Posts
    38
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    thanks for you input guys.
    i'm gonna keep thinking about it.



    entropie

    patrick
    04/95 BMW M3
    ~Nakamichi cd-500~ ~DLS UP6~ ~Alumapro BP-10~ ~A/D/S/ PH30.2~

  11. #11
    Immacomputer's Avatar
    Immacomputer is offline Cloud disappear



    Join Date
    Sep 2006
    Location
    Ocala/Oviedo, FL
    Age
    30
    Posts
    4,670
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    You should experiment with various lengths of PVC pipes. Even though it will be difficult to impossible to calculate the tuning frequency, you could always experiment by ear to see what you think sounds best. I doubt it will work well but there is a pressure build up in the trunk which will excite the air mass in the port.

    I would start with like 2 or 3 4" PVC pipes and start them with a length that is close to the max height you have available while keeping the ports about 6" from the bottom of the trunk. Then, you can trim them down and see how the sound changes.

    Be careful though, as making small changes may make the differences harder to tell. You may want to have two sets and make one set your max length and make the other only about 4" deep each or so. Replace them back to back and see if you can tell a difference. It will only cost you around $10 at Lowes for the PCV pipping.



    Video 1
    I may make you feel but I can't make you think.
    Your sperm's in the gutter -- your love's in the sink.
    Video 2

  12. #12
    entropie's Avatar
    entropie is offline stop talking and listen..

    Threadstarter


    Join Date
    Dec 2006
    Location
    Metro Detroit
    Posts
    38
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: ported trunk not box..?

    thanks, when i get around to trying i'll post my findings. (might take a while to find time)



    entropie

    patrick
    04/95 BMW M3
    ~Nakamichi cd-500~ ~DLS UP6~ ~Alumapro BP-10~ ~A/D/S/ PH30.2~

Closed Thread

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
1e2 Forum