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  #1  
Old 07-09-2011, 03:13 PM
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Default one last check on 4th order

so here is my finnal idea on how to work my 4th order

all outside walls are 4" thick, inside baffle will be 1.5", maybe 2.25" if i need it.
all measurements on the pic are from external
i need 12cf on the sealed side, and with the subs on the ported side im looking right about 29cf before sub displacement
port measures 14" tall 40" wide and will be 8" long will be external and will be 3/4" board, and should be 8" long for 45hz tuning
the v will be 1" off the back wall to get me to the 12cf with each side of the v being 38" and meeting in the center.
going in the bed of a 96 ram 1500 standard cab short box
cabin is right about 60" wide, 45" tall and 40" to the windshield from the port
will be for 12 obsidian 12d4's on a rd D9 @ .66ohm for now looking to strap 2 @ 1.5ohm in the future
if any more info is needed just let me know, im just looking for some feedback before i put the center baffle in
here are obsidian's tsp's
12" D2:
Re: 4.0 Ohm
Fs: 33 Hz
Qms: 5.21
Qes: 0.56
Qts: 0.51
Vas: 34.4
Le: 2.21 mH
BL: 19.1
SPL: 85.4 dB
Sd: 490 cm^2
Mms: 243.1 g
Xmax: 18mm
Xmech: 36mm

all i could find was the d2 if i need the d4 tsp's let me know and i will email nick or jacob
Recommended enclosure sizes for the 12" are as follows:
1.0 to 1.75 ft^3 sealed.
1.75 to 2 ft^3 ported tuned at 30 to 35 Hz.

Cutout: 11.10"
Mounting depth: 6.75"
Mounting flange to top of surround: 1.25"
OD: 12.5"
Displacement: 0.16 ft^3
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rd d9 @ .5ohm
2 sa Zv1's 5.8cf tuned to 48 or 32 with port plugs
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  #2  
Old 07-10-2011, 04:24 AM
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Quote:
Originally Posted by tymoto21 View Post
so here is my finnal idea on how to work my 4th order

all outside walls are 4" thick, inside baffle will be 1.5", maybe 2.25" if i need it.
all measurements on the pic are from external
i need 12cf on the sealed side, and with the subs on the ported side im looking right about 29cf before sub displacement
port measures 14" tall 40" wide and will be 8" long will be external and will be 3/4" board, and should be 8" long for 45hz tuning
the v will be 1" off the back wall to get me to the 12cf with each side of the v being 38" and meeting in the center.
going in the bed of a 96 ram 1500 standard cab short box
cabin is right about 60" wide, 45" tall and 40" to the windshield from the port
will be for 12 obsidian 12d4's on a rd D9 @ .66ohm for now looking to strap 2 @ 1.5ohm in the future
if any more info is needed just let me know, im just looking for some feedback before i put the center baffle in
here are obsidian's tsp's
12" D2:
Re: 4.0 Ohm
Fs: 33 Hz
Qms: 5.21
Qes: 0.56
Qts: 0.51
Vas: 34.4
Le: 2.21 mH
BL: 19.1
SPL: 85.4 dB
Sd: 490 cm^2
Mms: 243.1 g
Xmax: 18mm
Xmech: 36mm

all i could find was the d2 if i need the d4 tsp's let me know and i will email nick or jacob
Recommended enclosure sizes for the 12" are as follows:
1.0 to 1.75 ft^3 sealed.
1.75 to 2 ft^3 ported tuned at 30 to 35 Hz.

Cutout: 11.10"
Mounting depth: 6.75"
Mounting flange to top of surround: 1.25"
OD: 12.5"
Displacement: 0.16 ft^3
Awesome man. Ill take a look at it today and let you know what I figure out.
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  #3  
Old 07-10-2011, 09:24 AM
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with a qts of .51 they are very good canidates for 4th order. your ratio is a little peaky, id suggest more sealed chamber to try and get to 2:1 ratio. try and stick with 20" per cft port. with a horn that long that sumbtch gonna play monster lows.
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Old 07-10-2011, 09:30 AM
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the entire idea is to murder da lows
it is not very far from a 2:1, 12cf about 26cf ported, the only concern i have is the port, with it being so big, just to get the 45hz (now more like 40hz tuning from 11.5" port) idk if it will have enough control over the subs, and idk how the top subs are going to like playing right into the port.
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rd d9 @ .5ohm
2 sa Zv1's 5.8cf tuned to 48 or 32 with port plugs
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Old 07-10-2011, 09:46 AM
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ok ya ur close on the 2:1. dont worry about port placement, i like symetrical ports so all subs are loaded equal but should not be a big concern since your horn is so long. the cone control for the drivers comes more from correct port area and ur real close to 20" so you should be good. here is a vid from an old school friend of mine. his is similar to what ur doing. 16-12" 4th order. he is more near the 1:1.75 ratio. this thing hammers the lows like mad. YouTube - ‪John "Mother F'n" Hone! American Bass!‬‏
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Old 07-10-2011, 10:10 AM
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lol yeah johns truck is brutal!!! nothin like feelin 7hz!!!lmao
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Old 07-10-2011, 10:31 AM
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Quote:
Originally Posted by HACKMUNCH View Post
ok ya ur close on the 2:1. dont worry about port placement, i like symetrical ports so all subs are loaded equal but should not be a big concern since your horn is so long. the cone control for the drivers comes more from correct port area and ur real close to 20" so you should be good. here is a vid from an old school friend of mine. his is similar to what ur doing. 16-12" 4th order. he is more near the 1:1.75 ratio. this thing hammers the lows like mad. YouTube - ‪John "Mother F'n" Hone! American Bass!‬‏

but he is also tuned into the 30hz range with a 4th order. so it should play the lows well. same with hanks truck. you only get so much port with taking that back window out
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Old 07-10-2011, 10:48 AM
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well 485sq" is alot of port i would think, and it should be tuned right at 45hz with 11" port, and be 12cf sealed, 23.09cf ported at 45hz,
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Old 07-10-2011, 10:54 AM
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can play with the tuning to your liking. personally i start were you are now and just play with it
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Old 07-10-2011, 11:25 AM
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yea start with 45hz and work down.
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