Closed Thread
Results 1 to 2 of 2

Reload Thread: port calculation, gross box or minus the port itself?

  1. #1
    Alex JB's Avatar
    Alex JB is offline Senior VIP Member



    Join Date
    Oct 2008
    Location
    Chicago IL
    Posts
    212
    Post Thanks / Like
    Mentioned
    0 Post(s)

    port calculation, gross box or minus the port itself?

    I'm a bit confused, there's no surprise.

    The port length calculation I used is this ((14630000*(D/2)*(D/2))/((Fb*Fb*Vb*1728)-(1463*(D/2))))
    Sticky confirms gross volume is without port or subs volumen removed.

    This is 2 x E8's, 0.6 cu ft each. for 30Hz = 4.5" dia port with something like 40" port length
    That would be like tacking an extra 0.35 cu ft of folded port onto the 1.2 cu ft of box.

    what do you think? 40" sounds a lot.
    Last edited by Alex JB; 09-25-2012 at 10:26 AM. Reason: I'm a muppet



    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take




  2. #2
    Alex JB's Avatar
    Alex JB is offline Senior VIP Member

    Threadstarter


    Join Date
    Oct 2008
    Location
    Chicago IL
    Posts
    212
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: port calculation, gross box or minus the port itself?

    Anyone?

    I read loads on here and DIYMA about 12'16" per cu ft being a good rule of thumb, but is that gross or net?
    even if it's gross volume, but 40" calc seem way too much port for a 1.7 cu ft gross box.



    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

Closed Thread

Similar Threads

  1. Port back/sub back, or sub up/port back in 4-door Blazer?
    By Captain_Ahab in forum Enclosure Design & Construction Help
    Replies: 7
    Last Post: 07-08-2007, 04:25 PM
  2. Is the box or subwoofer the reason for rattling/bad sq
    By AgEnT in forum Enclosure Design & Construction Help
    Replies: 2
    Last Post: 02-06-2007, 11:12 PM
  3. Revised Box Design... Is The Port Correct?
    By HardHittaz00 in forum Enclosure Design & Construction Help
    Replies: 5
    Last Post: 07-26-2006, 11:03 AM

Posting Permissions

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