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    Re: Box Design

    Quote Originally Posted by Mongo12 View Post
    I havent got any "real" midrange, still have the factory speakers -- ***** i know---
    I think I can get by tho for now..
    I think ill take your and bucks advice and try that common chamber design and make the port 3" instead of 2 . should I keep it (the port) 22 inches as drawn?


    also my geometry doesnt add up.. i drew the top board wrong it is supposed to rest on top of the side to equal 31.5 (27.75+3+.75).
    here is what I come up with:
    External dimensions: 18"H x 31.5"W x 20"D = 3.6 cubes net. with the port 3" x 18.5" = 55.5 sq" of port
    With the port 39" long, you will see a tune of 30hz.
    Response Curve:
    Last edited by quackhead; 07-02-2012 at 02:27 AM. Reason: 39, removed impedance ch.




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    Re: Box Design

    I hope someone like @Buck can double check and verify my geometry as well...maybe offer some advice on the the R's and what they really like.




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    Re: Box Design

    sounds good ill change the plans and go with that. unless buck disagrees thanks for the help. without your work it'd have been trial and error and alot of wasted mdf




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    Re: Box Design

    How tall is the box



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    Re: Box Design

    Quote Originally Posted by quackhead View Post
    here is what I come up with:
    External dimensions: 18"H x 31.5"W x 20"D = 3.6 cubes net. with the port 3" x 18.5" = 55.5 sq" of port
    With the port 39" long, you will see a tune of 30hz.
    Response Curve:
    \.




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    Re: Box Design

    ok so not to sound dumb.. but is the port 18.5 inches or 39 inches in your graph? or would i have to add 20.5" to the 18.5 inch port to get 30Hz?
    30hz sounds good to me since the probox is (i was told) tuned to around 45..

    the redline is scaled to 18.5 inches and the yellow shows where it would be at 39 inches .. unless i misunderstood your dimensions.
    Last edited by Mongo12; 07-02-2012 at 05:37 PM.




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    Re: Box Design

    I would do like 4.5-5 cubes.

    ---------- Post added at 07:04 PM ---------- Previous post was at 07:04 PM ----------

    What program is that?



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    Re: Box Design

    The 4.5-5 cubes is personal tastes, the 3.6 will work.



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    Re: Box Design

    will the 3.6 be tuned lower than the probox? and any ideas on the port should it be 18.5" or the ?39"? thats got me tripping




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    Re: Box Design

    The port should be around 39. I would like to see a shorter box or a different port style to get rid of the 3 wide and 18.5 tall, I'd like more 12 tall, 4.5-4.75 wide to keep the same port area. But that'd if you can fit the extra depth/width.



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    Re: Box Design

    Quote Originally Posted by Buck View Post
    I would do like 4.5-5 cubes.

    ---------- Post added at 07:04 PM ---------- Previous post was at 07:04 PM ----------

    What program is that?
    I used Final Calculator to work out box and port, then use UniBox408 to map it




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    Re: Box Design

    Quote Originally Posted by Buck View Post
    The port should be around 39. I would like to see a shorter box or a different port style to get rid of the 3 wide and 18.5 tall, I'd like more 12 tall, 4.5-4.75 wide to keep the same port area. But that'd if you can fit the extra depth/width.
    you think with the dems he has and the port up/sub up it would be better to go Precision port?




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    Re: Box Design

    He could do a single 6".



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    Re: Box Design

    the precisions are 6" x 18" could one use pvc or do you really get the gains they say using the $40 tube they sell
    also id have to add 3" to the width, that will work but 34" is the max width I can go. Would that xtra cubes make a difference?
    and since the box is 18" tall, how much space is required below the bottom of the port and the bottom of the box?




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    Re: Box Design

    Quote Originally Posted by Mongo12 View Post
    the precisions are 6" x 18" could one use pvc or do you really get the gains they say using the $40 tube they sell
    also id have to add 3" to the width, that will work but 34" is the max width I can go. Would that xtra cubes make a difference?
    and since the box is 18" tall, how much space is required below the bottom of the port and the bottom of the box?
    If you can do that extra width, now we are getting somewhere, assuming you still want subs up/port up configuration. Going back to the original design using these external dimensions:
    20" tall x 34" wide x 22" deep, the top of the box, where the subs and port opening will measure an overall 34" x 22"

    With the slot port at 4" wide and 20.5" across (22" - 1.5") make the port the same overall 39" long inside the box (except using the 4" design, instead of the 3") as post # 21, you will be at 4.8 cubes/net @ 31hz tuning and have less port noise introduced. This is a closer match to Buck's recommendations




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