hi everyone
i got jl audio two subs 10w3 -d4 d2 i'm willing to make a sealed box ....
so please guide me in the recmmended dimentions ... for one box and for two single box's ...
and is there any way i can know the dimentions for any sub ... either it's seald or ported ... from the air liter or cu.ft3
what's the formula ...
many thanks experts ,
Replies (7)
alanjlamore on 04/25/2005 16:31:37
There should be some paperwork that came with the subs that shows a recomended range of box volumes, sealed and ported.
There is a formula for finding it too if you have all the specs on the sub (which you can usually find online), but I don't know the formula. I'm pretty sure the formula is in one of the articles though.
Some of the more technical guys on this site probably know the formula, so I'm sure one of them will chime in.
Needasystem on 04/25/2005 18:46:21
http://www.clubknowledge.com/Car_Audio_FAQ/?t22
article for enclosure designes and sizes, and if you know the cu.ft of the enclosure you need, just do some calculations to figure out the dimensions, it gives an example of how to find dimensions from cu.ft, but the dimensions dont matter as much as the internal volume being as close to your cu.ft as possible.
swez on 04/25/2005 23:05:17
Am very confused by your post info tuning??? You say 10W3 d4, d2. Are these older JL subs? Are they 2+2 or 4+4 DVC's or a combo of both? Please clarify as the new W3 are 15" only.
Once we know that, we can try to sort out an option that may work.
What amp are you planning to use here?
Swez
only_tuning on 04/26/2005 03:35:15
Hi
no these are JL Audio w3 10 inch subs ... D4
the thing when i opened the box the info box wasn't there .. never mind ...
im willing to use 2x alpine mrd-301 amp ( 760 watt)
what do you think ?
only_tuning on 04/26/2005 04:34:44
i guess i found the formula :
Cubic feet = Length x Width x Height in inches divided by 1728.
is it right ???
but do the formula include the mdf size 3/4 unch ...????
plz help me
swez on 04/26/2005 08:44:02
OK, from what I can tell, a sealed 10W will work well in a 0.75ft^3/sub enclosure. If you go ported, more like 1.25ft^3/sub. Sealed boxes give very good transient bass reponse... tight thumps! (good for rock & Jazz) Ported are more output SPL, but you give up power handling and accuracy. (Good for Hip-Hop or Rap)
Here's a very good site for modeling your enclosure. It calculates your box info and even gives a cut list. Just make sure you know the board thickness and sub displacement value (0,05ft^3/sub), as you plug in the data. Once you have the correct size and look, highlight the section and print out the details for your build list.
Note: This program will do sealed or ported calcs for you. However, it is designed for a single sub. Just replictate the box as 2 enclosures with a common center wall.
FYI: The min H & W for each chamber should be 13" H & 13" W /chamber to fit a 10" driver properly and look right. The only other factor to calculate is depth. Can you fit a pair of 13" H x 13" W x 11.25" D. This nets 0.75ft^3 per sub. You can go smaller if you wish and still get very good bass results. (per JL .pdf on 10W3-D4 specs)
http://www.jlaudio.com/subwoofers/pdfs/10W3v2_MAN.pdf
http://www.bcae1.com/spboxnew2.htm (for box builing programs)
Swez
PS To get the most from these subs, a pair of 300-350 Wrms amps will work just fine. (2 ohms/sub) Yes, you can go with a single sub amp that is 1 ohm stable as well and capable of 600-800 Wrms @ 1 ohm.
ttocs on 04/26/2005 14:12:54
As for the size, you want to calculate the internal dimensions, which come from finding the external dimensions and subtracting 1.5"(3/4" mdf times 2).
Go out and take a couple of measurements and i/we will get you through it. Find where you want to put the box. Normally they go behind the back seat, below the package tray(rear deck). Measure from the floor where the box will sit, to the lowest point on the bottom of the rear deck. If the speakers are haning down, or there are some bars that hang down, measure from the closest points. Now measure between the wheel well and all we will need to find out is how deep to make it.
i got jl audio two subs 10w3 -d4 d2 i'm willing to make a sealed box ....
so please guide me in the recmmended dimentions ... for one box and for two single box's ...
and is there any way i can know the dimentions for any sub ... either it's seald or ported ... from the air liter or cu.ft3
what's the formula ...
many thanks experts ,
Replies (7)
alanjlamore on 04/25/2005 16:31:37
There should be some paperwork that came with the subs that shows a recomended range of box volumes, sealed and ported.
There is a formula for finding it too if you have all the specs on the sub (which you can usually find online), but I don't know the formula. I'm pretty sure the formula is in one of the articles though.
Some of the more technical guys on this site probably know the formula, so I'm sure one of them will chime in.
Needasystem on 04/25/2005 18:46:21
http://www.clubknowledge.com/Car_Audio_FAQ/?t22
article for enclosure designes and sizes, and if you know the cu.ft of the enclosure you need, just do some calculations to figure out the dimensions, it gives an example of how to find dimensions from cu.ft, but the dimensions dont matter as much as the internal volume being as close to your cu.ft as possible.
swez on 04/25/2005 23:05:17
Am very confused by your post info tuning??? You say 10W3 d4, d2. Are these older JL subs? Are they 2+2 or 4+4 DVC's or a combo of both? Please clarify as the new W3 are 15" only.
Once we know that, we can try to sort out an option that may work.
What amp are you planning to use here?
Swez
only_tuning on 04/26/2005 03:35:15
Hi
no these are JL Audio w3 10 inch subs ... D4
the thing when i opened the box the info box wasn't there .. never mind ...
im willing to use 2x alpine mrd-301 amp ( 760 watt)
what do you think ?
only_tuning on 04/26/2005 04:34:44
i guess i found the formula :
Cubic feet = Length x Width x Height in inches divided by 1728.
is it right ???
but do the formula include the mdf size 3/4 unch ...????
plz help me
swez on 04/26/2005 08:44:02
OK, from what I can tell, a sealed 10W will work well in a 0.75ft^3/sub enclosure. If you go ported, more like 1.25ft^3/sub. Sealed boxes give very good transient bass reponse... tight thumps! (good for rock & Jazz) Ported are more output SPL, but you give up power handling and accuracy. (Good for Hip-Hop or Rap)
Here's a very good site for modeling your enclosure. It calculates your box info and even gives a cut list. Just make sure you know the board thickness and sub displacement value (0,05ft^3/sub), as you plug in the data. Once you have the correct size and look, highlight the section and print out the details for your build list.
Note: This program will do sealed or ported calcs for you. However, it is designed for a single sub. Just replictate the box as 2 enclosures with a common center wall.
FYI: The min H & W for each chamber should be 13" H & 13" W /chamber to fit a 10" driver properly and look right. The only other factor to calculate is depth. Can you fit a pair of 13" H x 13" W x 11.25" D. This nets 0.75ft^3 per sub. You can go smaller if you wish and still get very good bass results. (per JL .pdf on 10W3-D4 specs)
http://www.jlaudio.com/subwoofers/pdfs/10W3v2_MAN.pdf
http://www.bcae1.com/spboxnew2.htm (for box builing programs)
Swez
PS To get the most from these subs, a pair of 300-350 Wrms amps will work just fine. (2 ohms/sub) Yes, you can go with a single sub amp that is 1 ohm stable as well and capable of 600-800 Wrms @ 1 ohm.
ttocs on 04/26/2005 14:12:54
As for the size, you want to calculate the internal dimensions, which come from finding the external dimensions and subtracting 1.5"(3/4" mdf times 2).
Go out and take a couple of measurements and i/we will get you through it. Find where you want to put the box. Normally they go behind the back seat, below the package tray(rear deck). Measure from the floor where the box will sit, to the lowest point on the bottom of the rear deck. If the speakers are haning down, or there are some bars that hang down, measure from the closest points. Now measure between the wheel well and all we will need to find out is how deep to make it.
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