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Thread: Sub Woofer Construction Project

  1. #21
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Some other views of the face port cut. I think it's looking kinda cool though.
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  3. #22
    Chicken Fried Steak takethecastle57's Avatar
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    Default Re: Sub Woofer Construction Project

    Very nice work ! That bass line is going to rattle your fillings
    When things don't go right the 1st time , Step back ,Take a break and come back renewed. RGS

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  5. #23
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Here is a shot of the system with both woofers installed with additional sealing with an industrial hot glue gun in addition to carpenters glue and silicon sealant.

    The back terminals have not yet been installed so I'm still running the system from wires run through the face port and top cover. This thing is putting out some serious power. I tested it running the amp (Adcom 5300) at its maximum output (about 65watts pure/clean per channel) before clipping - whoa! This carries through even on a cement slab!

    There are still some small deficiencies in the main seals (top - I still need access) and some buzzing. Things in the shop started rattling and the neighbors came by to check out my new project.
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  7. #24
    Stuey - The RADministrator MrGneiss's Avatar
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    Default Re: Sub Woofer Construction Project

    Nice work!!

    "Blowing smoke rings at the moon."

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  9. #25
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    I spent some time cleaning up the ports, sanding the internals and insuring a clean fit. The seals are good and I've reinforced the whole structure heavily.

    I think it's very pretty in a techie sort of way!

    I sealed the rear firing woofer in, there is a permanent run of 12awg wire for the main connector.
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  11. #26
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    With the power level I'm running - 65w RMS per channel (clean) x2 for the sub woofer system alone I think it will be impressive. If I can keep the design clean and efficient it will be an outstanding performer. The room is 18.5ft x 24ft

    I've made some minor tweaks to the original design that I think "sound better and more powerful" while I was testing. In the end I think the project will be very impressive.

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  13. #27
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Sealing the rear firing 12in with 12awg wire - Three forward firing ports.
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  15. #28
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Thank you guys!

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  17. #29
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Now I'm going to port the energy forward toward the user in the second chamber.

    If I work things right, I think a set of clever foam baffles and series of small tuned ports and chambers will make this system both efficient and powerful.

    I added a full pound of polyfill in the rear firing section and added a test baffle, heavy density foam top cover and fill in the top firing second chamber.
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  19. #30
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Here is a look at the finalized top chamber foam lining in dark gray. This will deaden any echoing, buzzing, resonance and air flutter inside the chamber to give clean low frequency output.
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  21. #31
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Here are shots of the rough cut of the foam back baffle - It will serve to aim the sound through the front port and further dampen any unwanted characteristics.
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  23. #32
    Pachi Puro pinball wizard's Avatar
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    Default Re: Sub Woofer Construction Project

    awesome !

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  25. #33
    Sandwich Shooter ShockSystem's Avatar
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    Default Re: Sub Woofer Construction Project

    Thanks Pinball Wizard!

  26. #34
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Her is the finalized foam baffle - I sprayed it flat black to keep the interior of the chamber dark and nebulous. I will then cut two ports in the rear to fire backwards using the wall as another resonant surface. This will also raise the output level of the system as a whole.
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  28. #35
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Here is some pictures of the baffle construction in the rear firing chamber - It will increase the virtual airspace volume of the cabinet and reduce air flutter (audible whooshing noise of air moving through the ports) in addition to adding that solid "punch" for bass drums and sharp / fast sounds like gunshots, pops or impacts.

    It also includes a foam strip under the 12awg wire to insure there is no buzzing or rattling under heavy use.
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  30. #36
    Goodwill Ambassador luckydog's Avatar
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    Default Re: Sub Woofer Construction Project

    I hope it doesn't shift any of your internal organs when you crank up the volume
    幸運わんわん Luckydog or Yukiwanwan in Japanese

  31. #37
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    I'm thinking it will level out at about "tickle" or maybe "nudge".

  32. #38
    Pachi Puro pinball wizard's Avatar
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    Default Re: Sub Woofer Construction Project

    it needs to make the walls in your house vibrate !

  33. #39
    Pachi Puro Moparformances's Avatar
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    Default Re: Sub Woofer Construction Project

    i would like to have one to make the walls in the neighbors house vibrate..
    Never Doubt that a small group of thoughtful, .......... /........ If your not going to stand behind our troops
    ...committed people can change the world. ............. /.................Please, Please stand in front of them
    .....Indeed, it is the only thing that ever has............./
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  34. #40
    Sandwich Shooter ShockSystem's Avatar
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    Default Sub Woofer Construction Project

    Well... apparently during some of the testing, I did attract the attention (positive) from my neighbors. So I believe rattling the dishes in the house next door qualifies!

    - Not really that powerful, but it it was not only audible (and did vibrate things) but very clear and clean according to both my neighbors.

    I was testing the sub in conjunction with a 4ft main speaker tower I'm testing - I will post pictures of those as well.

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