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  #1  
Old 03-22-2011, 09:17 PM
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Default help on 4th order

so i think i have what i want down, just trying to fit it in in a way that will work how does this look and will i get any odd cancelations from the way the sealed chamber is

the dimentions are 33" to the start of the clam, 65" to the back, 30" tall, 50" wide, on the sealed side there is a 4" opening at the back of the clam shell but otherwise its 32" max dimention for each side same width and hight
it should be 8.6cf sealed after driver and bracing, 30.2cf ported the port is 14" tall x 23" wide and 6" deep for 40hz tuning, port will be going through the rear sliding window in a 96 ram 1500
subs will be 12 polk dxi 12d4's for now maybe sa12's down the road powered by 1 [email protected] for now
any help or suggestions would be very much appreciated as i have wire run 2 pos 2 neg (will probably do 2 more of each) and doing 3 6.5's in each door next week
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Old 03-22-2011, 10:10 PM
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also for the shell of the box i was going to lay out .25" mdf, .5" concret, then .75" mdf for bottom top and all sides
any idea's about that?
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Old 03-22-2011, 10:15 PM
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build it..u will be loud if u do

80
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Old 03-22-2011, 10:16 PM
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Cant help you out but sounds like its gonna be nasty Im interested
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Old 03-22-2011, 10:44 PM
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Quote:
Originally Posted by 80INCHES View Post
build it..u will be loud if u do

80
you think 4" behind the clam shell is enough to not interferre with eachother?
also will have steel angle iron frame around it for extra support and a frame to build on
and bbp6 says sealed chamber has f3 of 5hz and 8mm xmax with 5k down to 0hz so i hope it will really be a low end monster if thats how bbp6 works


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Old 03-22-2011, 10:52 PM
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Whyre you making it so peaky? Does phase stay within ~90degrees of the passband?

And I wanted a Speed3 but went with an 06 mustang GT. Stick wasnt practical.. but I enjoy the power and handling. Just wish the trunk was flat.
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Old 03-22-2011, 10:53 PM
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i dont use programs im lookin at tha ratio of the airspace and it looks like it has alot of potential
80
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Old 03-22-2011, 11:08 PM
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for some reason i couldnt upload the phase angle but it does stay within 90 degrees
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Old 03-22-2011, 11:39 PM
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Good deal.
The main things you would want to watch (In order, kindof) is displacement, phase, and group delay. Group delay is kindof a hard thing to manage though and isnt always too tame-able.

That peak is nasty though. Double that with the natural cabin peak around there and thatll be crazy.. let us know how it turns out.
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Old 03-22-2011, 11:53 PM
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Good deal.
The main things you would want to watch (In order, kindof) is displacement, phase, and group delay. Group delay is kindof a hard thing to manage though and isnt always too tame-able.

That peak is nasty though. Double that with the natural cabin peak around there and thatll be crazy.. let us know how it turns out.
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