Closed Thread
Results 1 to 8 of 8

Reload Thread: I've done the seaching, yet still have questions

  1. #1
    splitz's Avatar
    splitz is offline Junior Member



    Join Date
    Jul 2002
    Location
    Quantico, VA
    Age
    35
    Posts
    5
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Icon32 I've done the seaching, yet still have questions

    Ok, I'm almost done with the aquisition phase of the system; now to the planning, I am trying to build my first ported box and need a few tips.

    1. How far away from the inside wall should the opening of the port be ?

    2. Does it matter what side of the box the port goes? (same side as the sub, out the side of the box, out the top of the box)

    3. On WinISD the smaller the diamater of the port, the shorter the length...why?

    4. Is there an advantage/disadvantage in using 2 ports vs. 1?

    One more thing, I understand that rounding the edges of the port cuts down on the noise, so is this worth the money?

    http://www.partsexpress.com/pe/showd...D=117897&DID=7

    Thanks for the help
    Last edited by splitz; 04-22-2003 at 09:20 PM.







  2. #2
    paikiah's Avatar
    paikiah is offline Wangaholic



    Join Date
    Nov 2002
    Location
    Seoul, Korea
    Age
    37
    Posts
    7,770
    Post Thanks / Like
    Images
    46
    Mentioned
    0 Post(s)

    Re: I've done the seaching, yet still have questions

    Originally posted by splitz
    Ok, I'm almost done with the aquisition phase of the system; now to the planning, I am trying to build my first ported box and need a few tips.

    1. How far away from the inside wall should the opening of the port be ?

    A: as much as the diamter of the port for minimal turbulence.

    2. Does it matter what side of the box the port goes? (same side as the sub, out the side of the box, out the top of the box)

    A: This point has been debated about a number of times. SOme people say that it sounds a whole lot better when the port is on the same side as the cones. I say put it where you thiink looks best.


    3. On WinISD the smaller the diamater of the port, the shorter the length...why?

    More air pressure, I'd imagine. Remember, too small a diamter, you'll get port turbulence. 35~40m/s is the max, I think.

    4. Is there an advantage/disadvantage in using 2 ports vs. 1?

    Less port noise (turbulence) but the port will have to be considerably longer.


    One more thing, I understand that rounding the edges of the port cuts down on the noise, so is this worth the money?

    A: For slot port, you can easily do this with a dremel (hand grinder) or rough sandpaper. If circular, then you're talking about flared ports. These are supposed to reduce it somewhat, and I suggest it.. it won't cost you an arm and a leg.



    Team Caraudio

    Sony C90, 210 EQ
    Seas 27TDF/C, RE XXX 6.5, custom xo (dyn 240GT sitting idle)
    RF 60.2 amp
    eD A15.22
    Soundstream picasso 1400.1D

    Bass drive-by's are uncool.

  3. #3
    bass_mekanik's Avatar
    bass_mekanik is offline i got 0.5 2 go til 145dbs



    Join Date
    May 2002
    Location
    Launceston Tasmania
    Age
    28
    Posts
    1,028
    Post Thanks / Like
    Images
    5
    Mentioned
    0 Post(s)
    from my experience 25 m/s is the max i would allow for a daily enclosure cause my current boses have 31 m/s and all i get is a chuffing noise all the time



    Alpine 7892 Deck will get converted to am mp3 deck one day

    Apline DLC-176A splits

    Alpine MRD-M1000 sub amp i want 3 more

    Alpine MRV-T320 Split amp

    Alpine SWS-1241 woofers X2 they are mums i have better subs in store

    144.5 Db's worth on a linear X with mummys subs sealed wait till i port them and unleash the fury

    7 Months and 2 jobs later i am back louder smarter and alot poorer so watch yo asses cause i am back

    The aussie rice boi Slammed pulsar on 18's and tyres that are as thick as a condom :P

  4. #4
    paikiah's Avatar
    paikiah is offline Wangaholic



    Join Date
    Nov 2002
    Location
    Seoul, Korea
    Age
    37
    Posts
    7,770
    Post Thanks / Like
    Images
    46
    Mentioned
    0 Post(s)
    Originally posted by bass_mekanik
    from my experience 25 m/s is the max i would allow for a daily enclosure cause my current boses have 31 m/s and all i get is a chuffing noise all the time
    ah, 25...hmm, better make new calculations for my future ported box again. *sigh*



    Team Caraudio

    Sony C90, 210 EQ
    Seas 27TDF/C, RE XXX 6.5, custom xo (dyn 240GT sitting idle)
    RF 60.2 amp
    eD A15.22
    Soundstream picasso 1400.1D

    Bass drive-by's are uncool.

  5. #5
    splitz's Avatar
    splitz is offline Junior Member

    Threadstarter


    Join Date
    Jul 2002
    Location
    Quantico, VA
    Age
    35
    Posts
    5
    Post Thanks / Like
    Mentioned
    0 Post(s)
    m/s? not to sound like a complete idiot...what does that mean? I dont see that anywhere on WinISD.




  6. #6
    paikiah's Avatar
    paikiah is offline Wangaholic



    Join Date
    Nov 2002
    Location
    Seoul, Korea
    Age
    37
    Posts
    7,770
    Post Thanks / Like
    Images
    46
    Mentioned
    0 Post(s)
    Originally posted by splitz
    m/s? not to sound like a complete idiot...what does that mean? I dont see that anywhere on WinISD.
    you won't see it in the beta version, only on pro..

    rear port velocity.



    Team Caraudio

    Sony C90, 210 EQ
    Seas 27TDF/C, RE XXX 6.5, custom xo (dyn 240GT sitting idle)
    RF 60.2 amp
    eD A15.22
    Soundstream picasso 1400.1D

    Bass drive-by's are uncool.

  7. #7
    more_spl's Avatar
    more_spl is offline only have 1, but it's 12"



    Join Date
    May 2002
    Location
    Winnipeg
    Age
    28
    Posts
    1,108
    Post Thanks / Like
    Images
    7
    Mentioned
    0 Post(s)
    22m/s good for a daily driver tuned at 29hZ ?

    i wasn't sure if you are supposed to be above or below 25



    i decided not to have a signature

  8. #8
    splitz's Avatar
    splitz is offline Junior Member

    Threadstarter


    Join Date
    Jul 2002
    Location
    Quantico, VA
    Age
    35
    Posts
    5
    Post Thanks / Like
    Mentioned
    0 Post(s)

    OH S...

    Ok, I am dumb...I found m/s under the rear port velocity in WinISD after reading the posts(I had it in ft/s). Anyway, I did the default box (the one that is calculates for you then you tweek it from there) and the m/s is 56! Am I reading this wrong or something? Is the reading suppose to be taken at 1 watt or is it taken at the Max RMS your sub will be receiving?

    Thanks!




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