PR designs for the BPD 1803

Discussion in 'Archived Threads 2001-2004' started by Craig Woodhall, Jul 13, 2002.

  1. Craig Woodhall

    Craig Woodhall Supporting Actor

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    Hey guys, I built my 10.5ft3 (tuned to 18hz) box for my 1803.. It has tons of output but I think it is underported..It sounds like there is port compression or chuffing on loud bass passages (U-571).. Also, the type of pressures in the box, i think is revealing my shortcommings as a woodworker [​IMG].. Not to add to this but the box is about 200lbs..
    Im thinking I might go to a passive radiator box/design to make it smaller and eliminate the port.. Can i achieve the same amount/type of bass as my big ported box in a smaller pr'd box? Is stryke the only company that makes a fairly cheap PR that will work with the 1803? Would I need 3 or would 2 be fine?
    Any favorable alignments you could toss out would be much appreciated as well..
    Thanks,
    Craig
    here is a link to the driver
    http://www.missiondigital.net/product.asp?productid=21
     
  2. Jack Gilvey

    Jack Gilvey Producer

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  3. Craig Woodhall

    Craig Woodhall Supporting Actor

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    Jack,


    thanks for responding! I am using a 8.25" port, 33 inches long. I did some dado cuts on my box that weren't perfect, I think the pressures in the box are causing the joints to move and the box to flex..

    you say that a smaller pr'd box will roll off steeper at the tuning frequency? Couldn't I just tune it low (like 17hz) and use the rumble filter built into my Mackie amp to weed out the real low stuff?

    I was thinking about a 22" cube (a box within a box) with a Stryke 18" PR on 3 sides and the 1803 on another.. Using my Mackie in bridged mode and feed it 1400 watts..

    Craig
     
  4. Jack Gilvey

    Jack Gilvey Producer

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  5. Craig Woodhall

    Craig Woodhall Supporting Actor

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  6. Brian Bunge

    Brian Bunge Producer

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    Craig,

    Sorry I didn't respond to your email as I was out of town most of the weekend. Jack has pretty much summed up everything nicely though!

    Brian
     
  7. Craig Woodhall

    Craig Woodhall Supporting Actor

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    Thanks Brian!
     
  8. Craig Woodhall

    Craig Woodhall Supporting Actor

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    So basically, I wouldn't get as good as output as my vented box.. It would cost me about $700 CDN (3x18PR's)and all I would gain is a bit smaller box? I might just rebuild the box better at a cost of only $100.. It looks like the box I have now is the best for that driver. I might just go to a 10" port and have it come out the enclosure a couple inches..

    Craig
     
  9. Jack Gilvey

    Jack Gilvey Producer

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