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    adjetta's Avatar
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    best enclosure Port/Sub placement for maximum pressure(trunk)

    sub:Orion HCCA 15.4
    Power:1700rms until 2ohm recone then 2400rms

    Ok, so I have decided to go with an 8 inch Aero on my box project, the current plan is to make the box out of 3/4 mdf by the following dimensions

    Top fire config
    Width: 34" Height: 14.75" (.75 for double baffle) Depth: 27" Thickness: 0.75
    Interior Volume:5.9 cf (5.6 after displacement) the port tuning should be 30hz at 5.6 cf

    Front/back fire
    Width: 31" Height: 16.5" Depth: 25.75"(.75 for double baffle) Thickness: 0.75 *
    Interior Volume:6.0 cf (5.7 after displacement) the port tuning should be 30hz at 5.7 cf


    I am putting this box in a trunk, and the car has fold down seats. So what is the best woofer/port configuration for a trunk, I want to flex the crap out of my car, hit deep lows, and build as much cabin pressure as possible. Does anyone have any criticism or suggestions on this box plan, or does anyone know a good configuration.

    Notes...
    *My port is 20.75 inches Long, it consist of 2 8inch flares and a length of 8 inch pvc, I could make it longer with sonotube, but would prefer keeping the pvc
    * sub has about 4-5 inch of head room if top fired
    *should I add 1 or 2 inches to the depth so i can add up to .6 cubes of internal bracing
    *my back windows don't roll down, only the fronts, but I Normally roll with the fronts down
    *idk anything about box building this is going to be a learning expereince



    Ride: 2002 Infiniti I35
    HU: Pioneer PRS-80 w/ a JL Audio Linedriver
    Front Stage: Infinity ,Infinity KAPPA 6.09cs (front doors, rears need replacement)
    Sub Stage: Sundown Audio Z.V4 18"
    Front Amp: Soundqubed 120.4
    Sub Amp: Soundqubed 2200.1
    Power: Mechman 270A alt, Diehard advanced gold agm (775 CCA, 55ah) XS Power D3100, and something like 40' of stinger pro series zero gauge throughout




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    Re: best enclosure Port/Sub placement for maximum pressure(trunk)

    bump



    Ride: 2002 Infiniti I35
    HU: Pioneer PRS-80 w/ a JL Audio Linedriver
    Front Stage: Infinity ,Infinity KAPPA 6.09cs (front doors, rears need replacement)
    Sub Stage: Sundown Audio Z.V4 18"
    Front Amp: Soundqubed 120.4
    Sub Amp: Soundqubed 2200.1
    Power: Mechman 270A alt, Diehard advanced gold agm (775 CCA, 55ah) XS Power D3100, and something like 40' of stinger pro series zero gauge throughout

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    VisceralSound's Avatar
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    Re: best enclosure Port/Sub placement for maximum pressure(trunk)

    This is my VVX15 box in my trunk (little bigger than your plans) and it hits lows like a mofo and plays very well on mid-higher ranges too.
    Ports firing into cabin with the subfiring upwards through the rear deck (took rear speakers out).

    Currently did a 135.5 @35hz (but something was messed up, I'm sure it could have been closer to 40's)



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    Re: best enclosure Port/Sub placement for maximum pressure(trunk)

    Quote Originally Posted by vISUALHype View Post
    This is my VVX15 box in my trunk (little bigger than your plans) and it hits lows like a mofo and plays very well on mid-higher ranges too.
    Ports firing into cabin with the subfiring upwards through the rear deck (took rear speakers out).

    Currently did a 135.5 @35hz (but something was messed up, I'm sure it could have been closer to 40's)
    this is pretty close to my last box lol, I've heard firing the driver towards the cabin increase's pressure though



    Ride: 2002 Infiniti I35
    HU: Pioneer PRS-80 w/ a JL Audio Linedriver
    Front Stage: Infinity ,Infinity KAPPA 6.09cs (front doors, rears need replacement)
    Sub Stage: Sundown Audio Z.V4 18"
    Front Amp: Soundqubed 120.4
    Sub Amp: Soundqubed 2200.1
    Power: Mechman 270A alt, Diehard advanced gold agm (775 CCA, 55ah) XS Power D3100, and something like 40' of stinger pro series zero gauge throughout

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    VisceralSound's Avatar
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    Re: best enclosure Port/Sub placement for maximum pressure(trunk)

    I've got some decent pressure going on, I need cone area and moar powa!



    References: BigSix,

    This industry is about innovation and setting your own path

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    Re: best enclosure Port/Sub placement for maximum pressure(trunk)

    Subs back, port back has been proven to usually work the best for trunk cars, subs back port to the side has been known to do well also.



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    Moble Enclosurs is offline Box Designer/Builder



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    Re: best enclosure Port/Sub placement for maximum pressure(trunk)

    It all depends on the design guys. If you have a design that does not allow for linear output at say 33Hz, then you have to rely solely on the cabin to gain that pressure back. So, if you have the sub and port on the same baffle, then yes, in that case a rear load on both is recommended. If you have a higher tuning, a rear or top load may be recommended, depending on the design and what it does at each frequency. So, there is no perfect placement that anyone can use if you are looking to get the most out of the setup. It is very dependent on the designs performance BEFORE the vehicle is even considered. Then the losses/gains that the vehicle have will include the response and what changes will occur from there.

    A specific layout may be proven if a certain type of design is used all the time. So, if you keep the design simple in form, the effects of cabin placement will be similar for each design, which is why a common placement is always mentioned in questions like this.





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