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21" Maelstrom-X in 20 cubes @ 25Hz on BXI2608D?

Discussion in 'Subwoofer Box and Custom Fabrication' started by kryptonitewhite, Jul 23, 2009.

  1. kryptonitewhite

    kryptonitewhite Full Member

    My old box is external 42" wide, 38 tall in front, 32" tall in back, 30" deep on bottom, and 27.5" deep at the top. I have an 18" in it now just to play with, but I think I'm gonna drop a 21" M-X in it. I have a 7.75" round port that works great, no port noise, but that's obviousely not gonna work with the 21. So I'm thinking of cutting it out and dropping a 12" port in, I measure 27.5" from inside back wall to the outside front of exhisting port... so I can make the 12" port 15.25" long keeping it 1 port diameter away from the rear.

    This will make the box 20.03 cubes after sub/port displacement and a tuning of 25Hz... stupid low, but just where I want it. Should make Willi The Kid's "Love For Money" ring true with it's bottom note said to be 26Hz

    The M-X is dual 2 so I'd run it parallel 1 ohm to my Hifonics BXI2608D. 2600 RMS. Kevin of Exodus Audio says the sub, though rated with a Pe of 1800, would like 3000 RMS, so my 2600 "would be sick"


    I messed with WinISD and here's what I got, I plotted it in red along with ISD's default "best option" in yellow


    It doesn't reach it's 40mm Xmech/Xlim till below 20Hz or it's Xmax 33mm at about 22Hz

    [​IMG]

    looks like 5dB gain around tuning?

    [​IMG]

    cutting it close with 33m/s vent velocity at tuning

    [​IMG]

    nice big hump right where I want it (lower than most would want it)

    [​IMG]
     
    kryptonitewhite, Jul 23, 2009
    #1
  2. pedro quiroga

    pedro quiroga Well-Known Member

    nice..my new box and sub is at 28HZ now and hits the lows very well.

    me likey. i cant sacrifice 20 cubes for a sub tho.
     
    pedro quiroga, Jul 23, 2009
    #2
  3. kryptonitewhite

    kryptonitewhite Full Member

    is that what's in your sig and avatar?
     
    kryptonitewhite, Jul 24, 2009
    #3
  4. pedro quiroga

    pedro quiroga Well-Known Member

    yeah, the sub was free and now its being powered by a hifonics zues 2CH at 4 ohms mono. 1000x1 rms.

    thanks for pointing that out im going to change it.
     
    pedro quiroga, Jul 25, 2009
    #4
  5. kryptonitewhite

    kryptonitewhite Full Member

    how many cubes space you got for it
     
    kryptonitewhite, Jul 28, 2009
    #5
  6. pedro quiroga

    pedro quiroga Well-Known Member

    around 4 cubes. for a cheap as sub it dont sound half bad, and handles the power well with out any signs of bottoming out. even tho it has a crappy xmax rating of 14.1 mm.

    hell my 8's had the same rating too, and weigh as much as this 15. ed 8 = 10 LBs.

    15= 11~12LBs. but it was free.
     
    pedro quiroga, Jul 28, 2009
    #6
  7. pedro quiroga

    pedro quiroga Well-Known Member

    since my hatch space is all but gone..except for a lil space at the hatch. about 6 inches for sub clearance. i might just go nuts and get 2 big subs back there next tax return season.
     
    pedro quiroga, Jul 28, 2009
    #7