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    germandark's Avatar
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    amature clam shell design

    okay here is my pos sketch up # 1



    each port has (rounded up) 85in^ of port area.

    each is tuned to 36 hz. <<<< am I supposed to tune each port to the total desire tuning or what? I am working on trial and error.


    each side is 8.125ft cubed.

    ______

    My port area is a bit small, I know.

    I would glass corners/etc. and use threaded rod for bracing. I was thinking of double baffle for the subs.

    this is my first mock up...I am not too happy with it but I will keep on.

    ALSO I plan on dc level 4 15's


    questions & comments?



    CA: bunkerking09, jaredspl; CACO:- gentlejax2, 727Designs, g6ryder, Mike Stuber; FLSPL: Moore941, mikeyraw, Sonny123




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    Re: amature clam shell design

    ttt



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    Re: amature clam shell design

    looks identical to supergumby's....



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    Re: amature clam shell design

    I would try and tune a little lower within the 30-34hz range as thats where those subs are most comfortable at. Overall looks good and should thump.



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    Re: amature clam shell design

    who is supergumby? think he/she would mind if I asked a few questions?

    edit: that's the guy with the avalanche!....I was really impressed with his design, I tryed to base mine the same way but obviously smaller for my little ranger.



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    Re: amature clam shell design

    Quote Originally Posted by germandark View Post
    who is supergumby? think he/she would mind if I asked a few questions?

    edit: that's the guy with the avalanche!....I was really impressed with his design, I tryed to base mine the same way but obviously smaller for my little ranger.
    makes sense



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    Re: amature clam shell design

    #2 here.



    6.73ft cubed each side, 6.93 before guesstimated displacement.

    99in^ of port area for each side, total of 198in^

    effective port length is 24.5in so Ill just say 24in.

    tuned to 35 hertz, actually 35 point something.

    questions & comments?



    CA: bunkerking09, jaredspl; CACO:- gentlejax2, 727Designs, g6ryder, Mike Stuber; FLSPL: Moore941, mikeyraw, Sonny123

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    Re: amature clam shell design

    2 looks stronger, but sacrafice some box

    would firing 2 subs into each other cause problems?



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    Re: amature clam shell design

    Quote Originally Posted by 18inchjeepin View Post
    2 looks stronger, but sacrafice some box

    would firing 2 subs into each other cause problems?

    both enclosures would be braced with glass, and threaded rod.

    about the subs firing together...could cause and issue. I've seen people get 4 deep like that before and it sounded just fine. I wouldn't think cancellation would be too much of an issue, the dc level 4's have a bit over an inch of travel for xmax, if I remember correctly, so with the space between them I don't think their will be too much compression to cause cancellation. I could be wrong tho.



    CA: bunkerking09, jaredspl; CACO:- gentlejax2, 727Designs, g6ryder, Mike Stuber; FLSPL: Moore941, mikeyraw, Sonny123

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    Re: amature clam shell design

    No problems with the subs firing like that.. it would only cancel if the subs are moving in OPPOSITE directions. They are moving the same direction and are all pressurizing the middle chamber at the same time. Being "in phase" is more important then the direction they are aiming, even if its at each other.

    Looks great man. Although it does look like a 6th order quasi tuned bandpass



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    Building a stereo just to measure it's sound pressure level is like building a microwave oven for no reason other than to measure it's electromagnetic radiation emissions.

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    Re: amature clam shell design

    ttt for suggestions.



    CA: bunkerking09, jaredspl; CACO:- gentlejax2, 727Designs, g6ryder, Mike Stuber; FLSPL: Moore941, mikeyraw, Sonny123

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    Re: amature clam shell design

    Why 4 15's?



    3 8's

    39.9 consistently

    Quote Originally Posted by PV Audio View Post
    It will never be proved that loudness is somehow related to SPL because it isn't.

    Loudness, a subjective measure, is often confused with objective measures of sound pressure such as decibels or sound intensity.
    Quote Originally Posted by Pete Kulicki
    Building a stereo just to measure it's sound pressure level is like building a microwave oven for no reason other than to measure it's electromagnetic radiation emissions.

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    germandark's Avatar
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    Re: amature clam shell design

    I was favoring 8 12's originally, or 6. I am just planning right now.



    CA: bunkerking09, jaredspl; CACO:- gentlejax2, 727Designs, g6ryder, Mike Stuber; FLSPL: Moore941, mikeyraw, Sonny123

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    Re: amature clam shell design

    Firing against each other doesnt hurt anything, it really just acts to load the subs. I have 4 15''s in a tunnel blowthrough 4th order bandpass. All four of mine sit squarely though, no flare, been told that it also raises the power handling ability of the sub. I have 2.5 cu ft for each sub and 10 cu ft in the front chamber. My port is tuned to 30hz, i have great response from around 30-65hz. And by having the rear chambers sealed it has a nice low end extension with a very accurate sound. Also, nice that i only had to cut a 14''x14'' hole for the port and not a huge hole in the back of the cab.



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    Re: amature clam shell design

    the two inner subs (that arent angled) are going to fight against the port a wee bit, but it probably wont make an audible difference.

    If you can, slant all four subs. It will help with that a little bit. Your setup pretty much has the sub IN the port.

    Also, with that type of setup, im guessing your port length is as long as the end of the middle board? You may have taken this into account already, but that box design will treat the whole length (including those first subs) as port. if you havent taken that into account, tuning will come out much lower.



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