Closed Thread
Results 1 to 2 of 2

Reload Thread: aeroport length for 2 rl-p 12s in 4 ft^3?

  1. #1
    Lil Poot's Avatar
    Lil Poot is offline you sturrin at me brah?



    Join Date
    Jul 2005
    Location
    Wichita KS
    Age
    31
    Posts
    4,956
    Post Thanks / Like
    Mentioned
    0 Post(s)

    aeroport length for 2 rl-p 12s in 4 ft^3?

    i asked a friend of mine who is very knowledgable with enclosures and f-bodies (but puts a lot of stock in modeling programs, which i dont) to help me with the port designs on my box. i was shooting for a 4 ft^3 @30 hz box, when i asked him about it, this is the reply i got. he recommends 33hz, but i was shooting for 30 because i want this to hit LOW.

    To be honest with you, I think 4 cubes for those 2 subs is too big. The Qts on these subs is so low, that they really want a smaller box. I found that 1.5 cubes (each) tuned to 33hz gives a nice flat response. With the 1.5 cubes per sub (3 cubes total), you'd need 2 4" ports at 17.4" long each, or 3 3" ports at 15" long each.

    If you jump up to 2 cubes per sub (4 total) tuned to 30hz, the response thins out between 40 and 70hz, which I feel will hurt your overall bass response. But... at that size, your ports would be 15.5" long for the pair of 4" ports, and 13.37" long for the 3 3" ports.



    i was thinking 2 ft^3 was perfect for a ported rl-p 12. should i go ahead and do the 4 ft box or take his advice and do only 3? for the ports im using 2 4 inch aeroports. are the lengths he gave me about right? anyone else have any thoughts on this? if i have to, i can build it another inch and gain about another cubic foot, so i can go up to 5 if i have to.

    its goin in a firebird trans am, so the design is quite unorthodox. here are some pictures of my current sealed box. im basically going to build the same thing, just with a rectangular section extending about 1 and a half feet up to the backs of the back seats, box will be completely level at the top, and the added section will be 4-5 inches tall. im going to start on the box on my next day off, just going to build it, then get the exact size to cut the ports but i think i'm going to do it right at 4 ft. ill get plenty of pics

    someone told me i might be better off with 2 4.5 inch ports a bit shorter than 4 inch ports and longer, but i couldnt find them anywhere. links to good prefab ports?








    Alpine W205/H701
    Revolution Design D9 - 2 AQ HDC3 18s
    Genesis Profile Four Ultra - Creative SDX7 mids, TBI HDSS tweets
    Iraggi 240a, Optima g34 YT, 3 C&D 134ah, 15.3v MLA module, 120 ft 1/0, 200 ft^2 RAAMmat


    WTT/S - 2 HDC3 18s, RD HW 10, 880prs + ipod + 6 disc changer, Alumapro ALC6.2 Components, Zed built US Acoustics USA4050 + USA2200, Fisher Customs boxes




  2. #2
    Lil Poot's Avatar
    Lil Poot is offline you sturrin at me brah?

    Threadstarter


    Join Date
    Jul 2005
    Location
    Wichita KS
    Age
    31
    Posts
    4,956
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: aeroport length for 2 rl-p 12s in 4 ft^3?

    bump.

    in the middle of building the new box now, need to make the final decision on the ports. im going to use 2 4 inch aeroports. the subs are going to be in the same place. would i be best off having the ports in between the subs firing upward, or on the front of the box firing forward? does anyone know the diameter of the 4 inch aeroport at the widest part of the flare?



    Alpine W205/H701
    Revolution Design D9 - 2 AQ HDC3 18s
    Genesis Profile Four Ultra - Creative SDX7 mids, TBI HDSS tweets
    Iraggi 240a, Optima g34 YT, 3 C&D 134ah, 15.3v MLA module, 120 ft 1/0, 200 ft^2 RAAMmat


    WTT/S - 2 HDC3 18s, RD HW 10, 880prs + ipod + 6 disc changer, Alumapro ALC6.2 Components, Zed built US Acoustics USA4050 + USA2200, Fisher Customs boxes

Closed Thread

Similar Threads

  1. 2 SE 15's or 4 12's
    By BoominBeast in forum Subwoofers
    Replies: 5
    Last Post: 09-12-2004, 10:08 PM
  2. Going from 4 12s to 2 12s
    By SystemX in forum Subwoofers
    Replies: 22
    Last Post: 07-31-2004, 12:19 AM
  3. 2 ported 12s vs. 2 sealed 15s?
    By violator5spd in forum General Discussion
    Replies: 7
    Last Post: 07-14-2004, 05:27 PM
  4. Replies: 6
    Last Post: 08-22-2002, 12:03 AM
  5. Replies: 13
    Last Post: 08-21-2002, 03:25 AM

Posting Permissions

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

1e2 Forum