Closed Thread
Results 1 to 15 of 15

Reload Thread: Assassin Ported Box Complications

  1. #1
    Woodmister's Avatar
    Woodmister is offline Radford!



    Join Date
    Feb 2003
    Location
    NorthVA
    Age
    28
    Posts
    1,331
    Post Thanks / Like
    Images
    12
    Mentioned
    0 Post(s)

    Assassin Ported Box Complications

    So I have a 10" AA Assassin.
    AA says use 1.2cubes tuned to 32Hz
    I have ran three 'calculators/programs' trying to figure out the correct size of the box/port/port area and the RE one seems to differer from the other two the most.
    Help would be much appreciated

    I need to keep the external hight (12") and external width (33") the same, with the depth being variable.

    WIN ISD


    Subwoofertools.com http://www.subwoofertools.com/forum/ported-box.asp


    REAudio http://reaudio.com/speaker_box/LPort_Box_Calc.html
    Last edited by Woodmister; 04-01-2007 at 04:26 PM.



    My Garage NEW PICS/WRITEUP on the fiberglass




  2. #2
    mikey060's Avatar
    mikey060 is offline CarAudio.com Veteran



    Join Date
    Aug 2005
    Location
    Calgary, AB
    Age
    25
    Posts
    2,612
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Assassin Ported Box Complications

    pics no workie
    and from what i have heard...the re calculator isnt very accurate




  3. #3
    Woodmister's Avatar
    Woodmister is offline Radford!

    Threadstarter


    Join Date
    Feb 2003
    Location
    NorthVA
    Age
    28
    Posts
    1,331
    Post Thanks / Like
    Images
    12
    Mentioned
    0 Post(s)

    Re: Assassin Ported Box Complications

    Lets try it now, i could see how the RE wouldnt be right since the other two agree with eachother...



    My Garage NEW PICS/WRITEUP on the fiberglass

  4. #4
    kickerlivinloud's Avatar
    kickerlivinloud is offline Banning survivor



    Join Date
    Feb 2004
    Location
    Finger Lakes, NY
    Age
    27
    Posts
    3,280
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Assassin Ported Box Complications

    I wouldn't trust that calculator. I have found it to be way off from time to time. It also is spot on at times. Its just not constant. Here is an example...

    http://forum.realmofexcursion.com/sh...ad.php?t=23030


    In the thread a person used it to get a 2.2@32Hz

    He had 42"^2 of port with a port length of 44.75"

    I did a similar design a while back and it looked like this...


    As you can see the port area is the same and the volume is very close but, the port length isn't even close. Not by a long shot!


    Also if you take the info giving my the online calculator and add it all up, its doesn't match. I explained everything the best I could in the thread.


    I just don't trust online calculators. That my, I like to do it with pen, paper and a calculator. That why I know its right.



    Jon




  5. #5
    Woodmister's Avatar
    Woodmister is offline Radford!

    Threadstarter


    Join Date
    Feb 2003
    Location
    NorthVA
    Age
    28
    Posts
    1,331
    Post Thanks / Like
    Images
    12
    Mentioned
    0 Post(s)

    Re: Assassin Ported Box Complications

    Well I only ask cause the WinISD calculation kinda matches the sites calculations/box plans.

    Its kinda hard to mistrust WinISD right?



    My Garage NEW PICS/WRITEUP on the fiberglass

  6. #6
    Woodmister's Avatar
    Woodmister is offline Radford!

    Threadstarter


    Join Date
    Feb 2003
    Location
    NorthVA
    Age
    28
    Posts
    1,331
    Post Thanks / Like
    Images
    12
    Mentioned
    0 Post(s)

    Re: Assassin Ported Box Complications

    PS, just checked it with http://www.carstereo.com/help/Articles.cfm?id=31

    For:
    1.2 cubes 32hz
    Port Height: 10.5"
    Port width: 2"

    It gives me a length of 41.27"

    So now we have 3 sources that say ~40" of length for the same dimensions.

    I checked the volume of the box, and its pretty darn close...



    My Garage NEW PICS/WRITEUP on the fiberglass

  7. #7
    kickerlivinloud's Avatar
    kickerlivinloud is offline Banning survivor



    Join Date
    Feb 2004
    Location
    Finger Lakes, NY
    Age
    27
    Posts
    3,280
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Assassin Ported Box Complications

    Quote Originally Posted by Woodmister View Post
    PS, just checked it with http://www.carstereo.com/help/Articles.cfm?id=31

    For:
    1.2 cubes 32hz
    Port Height: 10.5"
    Port width: 2"

    It gives me a length of 41.27"

    So now we have 3 sources that say ~40" of length for the same dimensions.

    I checked the volume of the box, and its pretty darn close...



    One question, What is the gross volume of the enclosure??? I just did a design with 1.2 as gross (wasn't paying attention) and got a final port length of 41.2" for the same info given. This is not correct b/c I didn't have the right gross volume.

    I didn't say its always wrong but it is inconsistent. For some enclosures its spot on but, others its not even close..



    Jon




  8. #8
    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)

    Re: Assassin Ported Box Complications

    I only trust winisd. Every enclosure I have built using it's port lengths have measured to be almost identical.



    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

  9. #9
    mlstrass's Avatar
    mlstrass is offline Shaggy DOA



    Join Date
    Jul 2006
    Location
    Illinois
    Posts
    10,493
    Post Thanks / Like
    Mentioned
    28 Post(s)

    Re: Assassin Ported Box Complications

    When using subwoofertools you need to change the xmax number around until you get the desired port ^2




  10. #10
    mlstrass's Avatar
    mlstrass is offline Shaggy DOA



    Join Date
    Jul 2006
    Location
    Illinois
    Posts
    10,493
    Post Thanks / Like
    Mentioned
    28 Post(s)

    Re: Assassin Ported Box Complications

    Why does it need to be 33" wide?




  11. #11
    Woodmister's Avatar
    Woodmister is offline Radford!

    Threadstarter


    Join Date
    Feb 2003
    Location
    NorthVA
    Age
    28
    Posts
    1,331
    Post Thanks / Like
    Images
    12
    Mentioned
    0 Post(s)

    Re: Assassin Ported Box Complications

    To use in this cubby before it starts to decrease in hight. It goes from 12" in the center (under the material) to 11 at about 2" on each side




    My Garage NEW PICS/WRITEUP on the fiberglass

  12. #12
    mlstrass's Avatar
    mlstrass is offline Shaggy DOA



    Join Date
    Jul 2006
    Location
    Illinois
    Posts
    10,493
    Post Thanks / Like
    Mentioned
    28 Post(s)

    Re: Assassin Ported Box Complications

    I used subwoofertools and got a decent box/port going narrower. Like 28" wide I think.




  13. #13
    Woodmister's Avatar
    Woodmister is offline Radford!

    Threadstarter


    Join Date
    Feb 2003
    Location
    NorthVA
    Age
    28
    Posts
    1,331
    Post Thanks / Like
    Images
    12
    Mentioned
    0 Post(s)

    Re: Assassin Ported Box Complications

    ^ for your or mine?



    My Garage NEW PICS/WRITEUP on the fiberglass

  14. #14
    mlstrass's Avatar
    mlstrass is offline Shaggy DOA



    Join Date
    Jul 2006
    Location
    Illinois
    Posts
    10,493
    Post Thanks / Like
    Mentioned
    28 Post(s)

    Re: Assassin Ported Box Complications

    For yours. Was going to send you the link, but GF got on the PC and closed the window out. Just trying doing a narrower box, changing xmax to get the right port size, and you should be able to get an "L" port.




  15. #15
    Woodmister's Avatar
    Woodmister is offline Radford!

    Threadstarter


    Join Date
    Feb 2003
    Location
    NorthVA
    Age
    28
    Posts
    1,331
    Post Thanks / Like
    Images
    12
    Mentioned
    0 Post(s)

    Re: Assassin Ported Box Complications

    Well I dropped the xmax to 15mm (instead of 15.5) and got an L port.
    But it decreased the port area to ~18.75 sq in (1.75x10.5)
    From 21sq in (2"x10.5")

    WinISD didnt show a change in the vent mach (.04) from the two different port sizes, just saved me ~5" of port length with the smaller port...

    What is an acceptable port area for a 10"?



    My Garage NEW PICS/WRITEUP on the fiberglass

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