Hey..i'm almost finished with my speaker box for my two 10'' JL audio subs..and i have 1 question!
1)How deep does the box have to be? If the sub is 6 inches deep, im making the box about 8 and a half...does that sound right? thanks guys, you all rock!
Replies (7)
P0werLifter on 10/26/2005 23:55:42
You should be ok with 2 1/2" of clearance from the magnet to the back wall of the enclosure. On average we prefer to have 2-3" of clearance for cooling the driver when building enclosures. You should be fine.
-PL
swez on 10/27/2005 09:36:20
These subs hav cooling vents in the voice coil chamber, just above the spider. There are no vents in the rear part of the magnet.
It is good to have a minimum of 2.0" clearance from the magnet to back of the box. What matters most, is the internal air space volume for each sub. When using dual subs, it is best to use separate chambers for each sub with a divider board between them. That board provide structural support and a sealed air chamber for each sub.
Finally, use the recommended designs per the JL .pdf file I gave you the other day. You can adjust H, W & D of the enclosure to fit. However, the internal air space dimensions need to be within +/- 10% of box specs for best results.
Swez
asplundher on 10/27/2005 19:58:00
Also, there is a median for enclosure depth to help avoid excess internal resonance modes. This is why cubical boxes are so popular. Of course deviating from it will not necessarily hurt. Just as long as the box is not too shallow nor deep. There are times which it cannot be helped (limited space in a truck cab for example) but there are ways to counteract it as well (fiberglass insulation, polyfill, etc).
lilschtive on 10/27/2005 21:45:32
ok...so i should put a board in between the 2 subs?
compvr15s on 10/27/2005 23:26:08
yea having the box seperated will give you optimal performance. air tight between the two.
lilschtive on 10/28/2005 20:30:55
Ok...i put the board in, and cocked all sides with a sealent.
i have a 1 inch hole for the air to get out...ive seen it on subs, and on my mTx thuder roads..is that going to be ok, or should i take it out somehow and patch it up
swez on 10/28/2005 20:51:46
If you are building a sealed enclosure, you'll want each chamber to be air tight to each other and to the outside world. Any leaks or unpatched holes will effect sub performance in a negative manner.
If you can, use that 1" hole to mount a speaker terminal cup. Seal that up with caulk too. Otherwise, seal up that 1" hole from inside the box with a 2" x 2" piece of MDF.
TIP: To hide that outer hole, get a small mixing container, grab a handful of sawdust and mix it with wood glue, to form a thick paste. Fill in the hole and allow it to air dry overnight at room temps. Then, sand it flush to the surface. It'll look like a patch, but you can paint or cover it with carpeting. But the plug will be very solid if you over pack it a tad.
This stuff is hard to sand well with the glue in it. But with patience and a little luck, it will not come out or leak air.
Swez
1)How deep does the box have to be? If the sub is 6 inches deep, im making the box about 8 and a half...does that sound right? thanks guys, you all rock!
Replies (7)
P0werLifter on 10/26/2005 23:55:42
You should be ok with 2 1/2" of clearance from the magnet to the back wall of the enclosure. On average we prefer to have 2-3" of clearance for cooling the driver when building enclosures. You should be fine.
-PL
swez on 10/27/2005 09:36:20
These subs hav cooling vents in the voice coil chamber, just above the spider. There are no vents in the rear part of the magnet.
It is good to have a minimum of 2.0" clearance from the magnet to back of the box. What matters most, is the internal air space volume for each sub. When using dual subs, it is best to use separate chambers for each sub with a divider board between them. That board provide structural support and a sealed air chamber for each sub.
Finally, use the recommended designs per the JL .pdf file I gave you the other day. You can adjust H, W & D of the enclosure to fit. However, the internal air space dimensions need to be within +/- 10% of box specs for best results.
Swez
asplundher on 10/27/2005 19:58:00
Also, there is a median for enclosure depth to help avoid excess internal resonance modes. This is why cubical boxes are so popular. Of course deviating from it will not necessarily hurt. Just as long as the box is not too shallow nor deep. There are times which it cannot be helped (limited space in a truck cab for example) but there are ways to counteract it as well (fiberglass insulation, polyfill, etc).
lilschtive on 10/27/2005 21:45:32
ok...so i should put a board in between the 2 subs?
compvr15s on 10/27/2005 23:26:08
yea having the box seperated will give you optimal performance. air tight between the two.
lilschtive on 10/28/2005 20:30:55
Ok...i put the board in, and cocked all sides with a sealent.
i have a 1 inch hole for the air to get out...ive seen it on subs, and on my mTx thuder roads..is that going to be ok, or should i take it out somehow and patch it up
swez on 10/28/2005 20:51:46
If you are building a sealed enclosure, you'll want each chamber to be air tight to each other and to the outside world. Any leaks or unpatched holes will effect sub performance in a negative manner.
If you can, use that 1" hole to mount a speaker terminal cup. Seal that up with caulk too. Otherwise, seal up that 1" hole from inside the box with a 2" x 2" piece of MDF.
TIP: To hide that outer hole, get a small mixing container, grab a handful of sawdust and mix it with wood glue, to form a thick paste. Fill in the hole and allow it to air dry overnight at room temps. Then, sand it flush to the surface. It'll look like a patch, but you can paint or cover it with carpeting. But the plug will be very solid if you over pack it a tad.
This stuff is hard to sand well with the glue in it. But with patience and a little luck, it will not come out or leak air.
Swez
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