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Old 05-20-2010, 10:41 AM
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Default 4th order gurus and users help me plz!

Ok guys here's what i want my 4th order to do. im wanting something that will Peak in the 30-34hz range just like my current ported box, but i just want an 4th order bandpass this go round. i have an 1996 Tahoe so i have tons of room only thing im limited to is 49"Wide, anything else can be what ever, being that i want this non walled, i still dont care about the box going over the window line, and i also dont care about loosing my back seats, which is already in effect.

Sorry i just realized i didn't mention the subs. im using 2 18" Fi BTL's.

here's my current plans for the 4th order, im going for max efficiency on the lows so i want to use:

Sealed Chamber:6 Cubes
ported Chamber:Big as i can get it thinking 12 cubes plus
Tunning:around 40hz, i know may seem stupid low, but remember that's my goal, don't really care for anything over 37hz honestly.

guys just let me know what u think about my design or plans so far, if anyone is good at Sketch is it possible to draw me something, i plan on having the box REAR FIRING.
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Old 05-20-2010, 10:46 AM
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sounds like you have a good plan to me.
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Old 05-20-2010, 10:47 AM
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Shrink the rear chamber to about 2 cubes per sub and make the front chamber as big as you can then shrink it from there. You also may play with the port size as well.
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Old 05-20-2010, 10:47 AM
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sounds like you have a good plan to me.
thanks bro i was thinking i was on the right track.
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Old 05-20-2010, 10:50 AM
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Shrink the rear chamber to about 2 cubes per sub and make the front chamber as big as you can then shrink it from there. You also may play with the port size as well.
any particular reason i should shrink the rear chamber? ive talked with several people in the pass who went with bigger sealed chambers and got louder, even overpowering the subs, this 1 particular person happen to bassrace in the 59 class with only 8 subs. most people may know who im talking about.
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Old 05-20-2010, 12:11 PM
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Are you talking about Pete S?
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Old 05-20-2010, 12:26 PM
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Are you talking about Pete S?
I would assume so.
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Old 05-20-2010, 12:32 PM
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any particular reason i should shrink the rear chamber? ive talked with several people in the pass who went with bigger sealed chambers and got louder, even overpowering the subs, this 1 particular person happen to bassrace in the 59 class with only 8 subs. most people may know who im talking about.
it really depends on the application, some gained by shrinking their sealed chambers.

i think 6 common is fine, because of your low frequency goals.

just be prepared to play with the port tuning.
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Old 05-20-2010, 03:27 PM
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Are you talking about Pete S?
yes guys i was talking about pete.
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Old 05-20-2010, 03:29 PM
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it really depends on the application, some gained by shrinking their sealed chambers.

i think 6 common is fine, because of your low frequency goals.

just be prepared to play with the port tuning.
yes, once again thanks for the input, and i have a feeling im gonna need to do lot's of port work to get it right.
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