+ Reply to Thread
Page 9 of 12 FirstFirst 1 2 3 4 5 6 7 8 9 10 11 12 LastLast
Results 121 to 135 of 167

Reload Thread: The 4th order thread

  1. #121
    RangerDangerV2's Avatar
    RangerDangerV2 is offline CarAudio.com Veteran

    Threadstarter


    Join Date
    Nov 2011
    Location
    st cloud MN
    Posts
    4,869
    Post Thanks / Like
    Mentioned
    72 Post(s)

    Re: The 4th order thread

    gah, toasted my 3500. blew a few output fets. oh well, at least I can fix it myself. just got to wait on my fets and drivers to get here, and I might mod it to do 5k@1. but well see if I feel like pulling the board or not



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!




  2. #122
    jdawg90's Avatar
    jdawg90 is offline Banned



    Join Date
    Dec 2007
    Location
    nc
    Posts
    2,727
    Post Thanks / Like
    Images
    19
    Mentioned
    3 Post(s)

    Re: The 4th order thread

    I take it Vb is box volume? Is that sealed or ported? I plugged that number in the formula you gave for Fc with the specs and reccomended ported box specs for the sa-12 v1 and v2 and got around 100 both times. For the sealed box volume I got closer to 200.

    The formula is Fc=sqrt[(Vas/Vb)+1]*Fs correct?




  3. #123
    RangerDangerV2's Avatar
    RangerDangerV2 is offline CarAudio.com Veteran

    Threadstarter


    Join Date
    Nov 2011
    Location
    st cloud MN
    Posts
    4,869
    Post Thanks / Like
    Mentioned
    72 Post(s)

    Re: The 4th order thread

    Quote Originally Posted by jdawg90 View Post
    I take it Vb is box volume? Is that sealed or ported? I plugged that number in the formula you gave for Fc with the specs and reccomended ported box specs for the sa-12 v1 and v2 and got around 100 both times. For the sealed box volume I got closer to 200.

    The formula is Fc=sqrt[(Vas/Vb)+1]*Fs correct?
    100 or 200 what? sa12 for example. vas=21.21, fs is 33.7. now, take 21.21/28.3168(1 cu ft in ltrs) this will give you .75 if you round it. now, add 1, and you get 1.75. then sqrt that and you get 1.33, then multiply that by the fs, so 33.7*1.33 and you get 44.821. that is your Fc.



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  4. Thanks jdawg90 thanked for this post
  5. #124
    shauncox26's Avatar
    shauncox26 is online now CarAudio.com Elite



    Join Date
    May 2013
    Location
    oxford ms
    Posts
    956
    Post Thanks / Like
    Mentioned
    5 Post(s)

    Re: The 4th order thread

    Hey guys newb on the 4 ths. Going to try on with my obsidian 12 s. So the larger chamber should be the ported one.




  6. #125
    RangerDangerV2's Avatar
    RangerDangerV2 is offline CarAudio.com Veteran

    Threadstarter


    Join Date
    Nov 2011
    Location
    st cloud MN
    Posts
    4,869
    Post Thanks / Like
    Mentioned
    72 Post(s)

    Re: The 4th order thread

    Quote Originally Posted by shauncox26 View Post
    Hey guys newb on the 4 ths. Going to try on with my obsidian 12 s. So the larger chamber should be the ported one.
    yes.... did you read the first page? I would start there



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  7. #126
    shauncox26's Avatar
    shauncox26 is online now CarAudio.com Elite



    Join Date
    May 2013
    Location
    oxford ms
    Posts
    956
    Post Thanks / Like
    Mentioned
    5 Post(s)

    Re: The 4th order thread

    Yes i did. Ok oas fs is 33 and the vas is 34.4 vb is 1.5 ft2 or 42.4752 lts. I came up with 44.3982 for my fc. So i tune my ported chamber to around 44 hz correct. So much to take in.




  8. #127
    RangerDangerV2's Avatar
    RangerDangerV2 is offline CarAudio.com Veteran

    Threadstarter


    Join Date
    Nov 2011
    Location
    st cloud MN
    Posts
    4,869
    Post Thanks / Like
    Mentioned
    72 Post(s)

    Re: The 4th order thread

    Quote Originally Posted by shauncox26 View Post
    Yes i did. Ok oas fs is 33 and the vas is 34.4 vb is 1.5 ft2 or 42.4752 lts. I came up with 44.3982 for my fc. So i tune my ported chamber to around 44 hz correct. So much to take in.
    yup, youre on the right track



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  9. #128
    shauncox26's Avatar
    shauncox26 is online now CarAudio.com Elite



    Join Date
    May 2013
    Location
    oxford ms
    Posts
    956
    Post Thanks / Like
    Mentioned
    5 Post(s)

    Re: The 4th order thread

    So i was thinking 1:3 was a good starting point. Ill post pics once i start.




  10. #129
    Buck's Avatar
    Buck is offline always low Buck is a Supporting Member of the forum!



    Join Date
    May 2008
    Location
    Nashville
    Posts
    18,378
    Post Thanks / Like
    Mentioned
    254 Post(s)

    Re: The 4th order thread

    I may try 1:2 first.



    Alpine - ASE (local) - Batcap - C&D Tech - CT Sounds - DC - eD - Excessive Amperage - Rainbow

  11. #130
    jdawg90's Avatar
    jdawg90 is offline Banned



    Join Date
    Dec 2007
    Location
    nc
    Posts
    2,727
    Post Thanks / Like
    Images
    19
    Mentioned
    3 Post(s)

    Re: The 4th order thread

    Quote Originally Posted by RangerDangerV2 View Post
    100 or 200 what? sa12 for example. vas=21.21, fs is 33.7. now, take 21.21/28.3168(1 cu ft in ltrs) this will give you .75 if you round it. now, add 1, and you get 1.75. then sqrt that and you get 1.33, then multiply that by the fs, so 33.7*1.33 and you get 44.821. that is your Fc.
    I didn't pay attention to units... I'm getting the right answer now.

    What's the difference in using a passband ripple (S) of .5, .6, and .7 when designing a box?
    Last edited by jdawg90; 07-16-2013 at 08:19 PM.




  12. #131
    Beatin''s Avatar
    Beatin' is offline CarAudio.com Elite



    Join Date
    Nov 2012
    Location
    MI
    Posts
    986
    Post Thanks / Like
    Mentioned
    2 Post(s)

    Re: The 4th order thread

    what!? The ported chamber has to be the bigger one? WinISD shows too much peak and group delay.



    All day I'm clippin'
    voltage be dippin'
    I don't give a damn,
    cause my trunk always hittin'!

    creating a proper sound wave. Step one, turn it up until clipping. Step two, done.

  13. #132
    RangerDangerV2's Avatar
    RangerDangerV2 is offline CarAudio.com Veteran

    Threadstarter


    Join Date
    Nov 2011
    Location
    st cloud MN
    Posts
    4,869
    Post Thanks / Like
    Mentioned
    72 Post(s)

    Re: The 4th order thread

    Quote Originally Posted by Buck View Post
    I may try 1:2 first.
    I would disagree, its easier to shrink down than gain more space.
    Quote Originally Posted by Beatin' View Post
    what!? The ported chamber has to be the bigger one? WinISD shows too much peak and group delay.
    forget winisd, it is highly innacurate.



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  14. #133
    RangerDangerV2's Avatar
    RangerDangerV2 is offline CarAudio.com Veteran

    Threadstarter


    Join Date
    Nov 2011
    Location
    st cloud MN
    Posts
    4,869
    Post Thanks / Like
    Mentioned
    72 Post(s)

    Re: The 4th order thread

    I have been getting quite a few pms lately, and it seems that all of you think that you need winisd to design a 4th order.... well, you dont. take the steps that have been explained, build it, test it, enjoy it.



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  15. #134
    RangerDangerV2's Avatar
    RangerDangerV2 is offline CarAudio.com Veteran

    Threadstarter


    Join Date
    Nov 2011
    Location
    st cloud MN
    Posts
    4,869
    Post Thanks / Like
    Mentioned
    72 Post(s)

    Re: The 4th order thread

    people.... if you pm me asking for advice, then listen to what I have to say. dont keep asking me about modeling programs, because they are useless. Ive had to tell about 10 people that in the past 2 days, and nobody is listening. If you pm me, and dont listen to my advice, then I will not respond back.



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  16. #135
    jdawg90's Avatar
    jdawg90 is offline Banned



    Join Date
    Dec 2007
    Location
    nc
    Posts
    2,727
    Post Thanks / Like
    Images
    19
    Mentioned
    3 Post(s)

    Re: The 4th order thread

    How does a high ratio effect the frequency spectrum the sub plays at ? Does it simply shrink it with the peak being the higher? In your pm you said if you want to hit the lows go with a larger FC. What exactly do you mean by that? A sub with a higher FC (I'd think it'd be the opposite, that's why I'm kinda confused)?




+ Reply to Thread
Page 9 of 12 FirstFirst 1 2 3 4 5 6 7 8 9 10 11 12 LastLast

Similar Threads

  1. Starting the 4th order
    By Durango03 in forum Car Audio Build Logs - Cars/Trucks/SUVs
    Replies: 29
    Last Post: 02-13-2013, 12:40 AM
  2. To the 4th order wizards out there
    By sxpimpin in forum Enclosure Design & Construction Help
    Replies: 6
    Last Post: 06-01-2011, 08:37 PM
  3. 4th order build for the 06' XXX 15
    By mobeious in forum Enclosure Design & Construction Help
    Replies: 71
    Last Post: 02-08-2007, 07:20 AM
  4. Got the Mach 5 in a 4th order...
    By jmanpc in forum Subwoofers
    Replies: 20
    Last Post: 12-24-2006, 06:22 PM
  5. Bad news on the 06' XXX 15 4th order build
    By mobeious in forum Enclosure Design & Construction Help
    Replies: 28
    Last Post: 11-14-2006, 05:59 PM

Posting Permissions

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