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    does this all make sence?

    hdc315 copper
    28" w
    21" h
    20" d
    port 19.5" x 4" = 78sqinch
    total port length 22"
    tuned to 39.78 hz
    cuft 4.53 before sub displacement
    cut list
    top 28x20
    bottom 28x20
    left side 19.25x18.5
    right side 19.5x18.5
    back 28x19.5
    front 23.35x19.5
    port 14.5x19.5

    gonna power with 1500rms
    going to do sub up and port back







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    Re: does this all make sence?

    You got a diagram we can go off of? Maybe it's just me cause I'm lazy but that's gonna take a while to check lol




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    Re: does this all make sence?

    cant say i do, its all on the back of a napkin kinda drawing



    pair of sundown sa8 v2 dvc 4 1.4cuft 32hz after displacements
    sundown 1500d v3
    jvc double din navi
    batcap2000

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    Re: does this all make sence?

    Quote Originally Posted by splescort View Post
    hdc315 copper
    28" w
    21" h
    20" d
    port 19.5" x 4" = 78sqinch
    total port length 22"
    tuned to 39.78 hz
    cuft 4.53 before sub displacement
    cut list
    top 28x20
    bottom 28x20
    left side 19.25x18.5
    right side 19.5x18.5
    back 28x19.5
    front 23.35x19.5
    port 14.5x19.5

    gonna power with 1500rms
    going to do sub up and port back
    Seems like a lot of port area. If those are the outer dimensions of the box you'll be down to more like 3 cube net with sub/wood/bracing/port displacement.

    15 square inches of port per cube of net volume 18" long should tune to around 40hz and is pretty much a win for this type of sub (or just use any of the cookie cutter DD boxes)




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    Re: does this all make sence?

    3 cuft????
    makes no sense
    5.53cuft is gross for 28x21x20 outer out of 3/4 wood
    then my sub displacement is 0.23 (as per DJ from AQ)
    and port displacement is 0.99
    so 5.53 gross - sub (0.23_ - port(0.99) = 4.31cuft
    bracing i am gonna use threaded rod so at max maybe another 0.10cuft
    so total net 4.21cuft.



    pair of sundown sa8 v2 dvc 4 1.4cuft 32hz after displacements
    sundown 1500d v3
    jvc double din navi
    batcap2000

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    Re: does this all make sence?

    Quote Originally Posted by splescort View Post
    3 cuft????
    makes no sense
    5.53cuft is gross for 28x21x20 outer out of 3/4 wood
    then my sub displacement is 0.23 (as per DJ from AQ)
    and port displacement is 0.99
    so 5.53 gross - sub (0.23_ - port(0.99) = 4.31cuft
    bracing i am gonna use threaded rod so at max maybe another 0.10cuft
    so total net 4.21cuft.
    Indeed. Just threw it into my spreadsheet and it looks good. 10" sono tube would make a find round port for that as well.... same length




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    Re: does this all make sence?

    whats better slot port or sono tube and why?



    pair of sundown sa8 v2 dvc 4 1.4cuft 32hz after displacements
    sundown 1500d v3
    jvc double din navi
    batcap2000

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    hispls's Avatar
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    Re: does this all make sence?

    Round port is somewhat supperior accoustically IMO. Also with sono tube it's really easy to make it a bit longer to try lower tuning then cut it down an inch at a time to experiment with higher tuning, or just carve it out and replace with a longer one if you want to go lower again. A bit less displacement since the walls are thinner, and only 8$ for a 4 footer at home depot.

    I find it's simple, functional, and allows a lot of flexibility as far as modifying tuning quickly and without major surgery.




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