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Question on a ported cabinet

Discussion in 'Amps and Cabs [BG]' started by subdude67, Jun 28, 2020.

  1. Jun 28, 2020 #1
    subdude67

    subdude67

    Jan 18, 2010
    Kenya
    I am building a 2x8 cab with Eminence Alpha 8 spekers. The specs for the vented speaker explain shape and size of the vent but all data is based on a single speaker. When using 2 speakers, does that affect the size and number of vents?
     
  2. Jun 28, 2020 #2
    Downunderwonder

    Downunderwonder

    Aug 26, 2009
    New Zealand
    Cab size doubles.
    Vent count doubles.
    Vent size remains identical.
     
    WillyWonka, fdeck and subdude67 like this.
  3. Jun 28, 2020 #3
    subdude67

    subdude67

    Jan 18, 2010
    Kenya
    Thanks, good to know!

    In the specs about the cabinet it states:
    Vent ends = one flush
    Dv = 3 in
    Lv = 3.475 in

    Assuming Dv and Lv are diameter and length of the vent, what does the one flush mean?
     
  4. Jun 28, 2020 #4
    Foz

    Foz

    Jul 26, 2008
    Jax FL USA
    mount the front edge of port tube flush to the front of baffle = the back end hangs in the air volume inside the cab
     
    subdude67 likes this.
  5. Jun 28, 2020 #5
    subdude67

    subdude67

    Jan 18, 2010
    Kenya
    Thanks. Is the location of the vent important, like in the bottom center or coner of the baffle? Or wherever?
     
  6. Jun 28, 2020 #6
    Downunderwonder

    Downunderwonder

    Aug 26, 2009
    New Zealand
    Traditional to make it pretty ie symmetrical in some fashion

    or follow ''golden ratio'' ie design by eye so it looks pretty. Usually extra elements appear on the 1/3 and 2/3 points across the largest part.

    or whenever it fits, not too close to the edge, because that's the only space left for it.