I need dimensions for a SPL (loud bass or loudest as possible) box if anyone can help me out for my L7 12" dual 4ohm 08 model pushed by USA amp md 1d. I want it to be ported, tuned to 30-35Hz (higher better, I think for loud w/o blowing sub), and be in the dimensions of 14H x23D x34L inches. I have that much room and only want SPL (Loudest bass, guessing SPL stands for loud bass.i would want a fourth order reflec box,2 piece front seald with plexiglass and back ported I would like to have just 1 port in the center facing back seat. The box has to be all wood (3/4-1.0"). If anyone can help me with a design .
Thanks a lot
frank
Replies (7)
FRANKYG on 11/24/2008 05:31:07
2004 nissan maxima , trunk space 14H x23D x34L inches
FRANKYG on 11/24/2008 05:31:40
I need dimensions for a SPL (loud bass or loudest as possible) box if anyone can help me out for my L7 12" dual 4ohm 08 model pushed by USA amp md 1d. I want it to be ported, tuned to 30-35Hz (higher better, I think for loud w/o blowing sub), and be in the dimensions of 14H x23D x34L inches. I have that much room and only want SPL (Loudest bass, guessing SPL stands for loud bass.i would want a fourth order reflec box,2 piece front seald with plexiglass and back ported I would like to have just 1 port in the center facing back seat. The box has to be all wood (3/4-1.0"). If anyone can help me with a design .
Thanks a lot
frank
admin on 11/24/2008 05:57:59
Ok, our guys will be on later after work to help you out HAPPY
ttocs on 11/24/2008 12:36:46
victor is the box expert.......... He is in india so his time might be a little different then yours but he can help.
cplkittle on 11/25/2008 16:25:26
There is really not enough room for a good 4th order box within those limits. If you built a box with the dimensions you gave, it would not fit into the trunk. If you built it in the trunk maybe, but you have to consider wiggle room to get it in the trunk. If you use 1" MDF, your internal dimensions would be 12x21x32. That only comes out to 4.66 cubic ft, minus speaker displacement, minus port displacement, minus the divider.
When you design 4th order boxes, the sealed side restricts the low frequency. In order to get a good 30-35Hz at a reasonable SPL, you would need 2 1/2 - 3 cubic ft on the sealed side alone to allow for the low frequency extension.
I would just go with a ported box.
If you used 3/4" MDF, you could build a ported box with outside dimensions of 14 x 21.5 x 25.5 that gives you an internal volume of 3.47 cubic ft. the port should be 12.5" tall, 2" wide, and 14" deep. (.44 cu. ft.) After subtracting the displacement for the port, you have a box tuned to 35 Hz.
swez on 11/25/2008 21:43:37
"Word up"! The L7 12" does it's best job in a large ported enclosure. (2.5-3.25 cf plus port and woofer displacements factored in)
Here's the manual for this sub:
http://akamaipix.crutchfield.com/Manuals/206/206810L54.PDF
Swez
Victor on 11/25/2008 22:54:23
Yes ... as swez and kittle stated.. the L7 is at its best in a ported enclosure of 3 cu.ft tuned to 35 Hz ....
the 4th order BP would be a big enclosure...
and with a pretty limited pass band too...
a ported enclosure is the best bet here....
Thanks a lot
frank
Replies (7)
FRANKYG on 11/24/2008 05:31:07
2004 nissan maxima , trunk space 14H x23D x34L inches
FRANKYG on 11/24/2008 05:31:40
I need dimensions for a SPL (loud bass or loudest as possible) box if anyone can help me out for my L7 12" dual 4ohm 08 model pushed by USA amp md 1d. I want it to be ported, tuned to 30-35Hz (higher better, I think for loud w/o blowing sub), and be in the dimensions of 14H x23D x34L inches. I have that much room and only want SPL (Loudest bass, guessing SPL stands for loud bass.i would want a fourth order reflec box,2 piece front seald with plexiglass and back ported I would like to have just 1 port in the center facing back seat. The box has to be all wood (3/4-1.0"). If anyone can help me with a design .
Thanks a lot
frank
admin on 11/24/2008 05:57:59
Ok, our guys will be on later after work to help you out HAPPY
ttocs on 11/24/2008 12:36:46
victor is the box expert.......... He is in india so his time might be a little different then yours but he can help.
cplkittle on 11/25/2008 16:25:26
There is really not enough room for a good 4th order box within those limits. If you built a box with the dimensions you gave, it would not fit into the trunk. If you built it in the trunk maybe, but you have to consider wiggle room to get it in the trunk. If you use 1" MDF, your internal dimensions would be 12x21x32. That only comes out to 4.66 cubic ft, minus speaker displacement, minus port displacement, minus the divider.
When you design 4th order boxes, the sealed side restricts the low frequency. In order to get a good 30-35Hz at a reasonable SPL, you would need 2 1/2 - 3 cubic ft on the sealed side alone to allow for the low frequency extension.
I would just go with a ported box.
If you used 3/4" MDF, you could build a ported box with outside dimensions of 14 x 21.5 x 25.5 that gives you an internal volume of 3.47 cubic ft. the port should be 12.5" tall, 2" wide, and 14" deep. (.44 cu. ft.) After subtracting the displacement for the port, you have a box tuned to 35 Hz.
swez on 11/25/2008 21:43:37
"Word up"! The L7 12" does it's best job in a large ported enclosure. (2.5-3.25 cf plus port and woofer displacements factored in)
Here's the manual for this sub:
http://akamaipix.crutchfield.com/Manuals/206/206810L54.PDF
Swez
Victor on 11/25/2008 22:54:23
Yes ... as swez and kittle stated.. the L7 is at its best in a ported enclosure of 3 cu.ft tuned to 35 Hz ....
the 4th order BP would be a big enclosure...
and with a pretty limited pass band too...
a ported enclosure is the best bet here....
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