Morning Gents. COFFEE , I had a question for yall. The new enclosure I am currently designing and getting ready to build on monday is very similar to LC1s design (http://www.clubknowledge.com/Car_Audio_FAQ/?g2072_1716).
The port is more or a less a transmission Line than a typical Port due to the two 90degree angles and the 2 baffles similar to LC1's.
The Internal dimensions of the enclosure are
18.5x18.5x16.5=5647.125
5647.125/1728= 3.2CuFt ~without the transmission line factored in.
Port dimensions are 2x16.5x25.5 (Tuned to 30hz)
I just want to make sure that I tack on another 5 1/2" of space for the Transmission line to be in so it does not take up the internal volume for the driver. (Since there are baffles in the port design it would take away from the internal air volume correct?)
Suggestions? Comments? Donations to my knowledge account?
~Jason
Replies (7)
P0werLifter on 08/13/2004 04:44:56
4got to add,
External Dimensions are 20x20x18 (without the TransmissionLine) using 3/4" MDF so the question would be do i tack on the 5.5"extra length for the enclosure for the transmission line to be in? So external Dimensions would be 20x25.5x18 and the internal would still be just about the same 3.2cuft for the driver?
If this isnt making much sense im sorry haha Pictures say a thousand words and my scanner isnt working.
~Jason
uochronos on 08/13/2004 05:00:57
from what i understand the port is not counted as part of the internal volume. you would need 3.0cubic feet for your sub plus the port area... although i'm not 100% sure on this that is my understanding. sine with a normal tube port you subtract the port volume from the internal volume.
Chronos
PS
let me know how this box sounds SQ wise i was considering building a similar box for my current sub.
P0werLifter on 08/13/2004 05:30:57
So then i would need to tack on the extra overall length for the enclosure to add in the Transmission line correct? or am i reading it wrong since its late (SEE what car audio does on the brain, cant sleep, cant think straight, all i see is designs, numbers being crunched in my head)
~Jason
PS, Ill let you know how it all turns out and sounds, Im mainly going for SPL but i wanted to try this type of design.
uochronos on 08/13/2004 06:14:34
yes from what i understand you would needto add the length of the port section to the box. that is if this works the same as calculating a tube port which i belive it should... wait for kittle or swez though to be sure...
P0werLifter on 08/13/2004 12:50:47
Alright thanks Chronos, Just wanted to make sure I had it planned correctly on paper before i started cutting all my wood. I'll wait for the others to be 100 positive.
~Jason
swez on 08/13/2004 18:35:13
Yes, you do need to account for the baffles as part of the internal airspace of the enclosure. Just measure each panel (H x W x T) and this will give you the sq in numbers for each baffle.
Example:
H = 18.5"
W= 16.5"
T= 0.75"
18.5 x 16.5 x .75 = 228.9 sq inches per baffle.
This is not your baffle size... but same idea.
Swez
P0werLifter on 08/14/2004 00:29:40
Alright cool Thanks..im pretty sure i had it planned correctly then on paper. So ill go a head and start building it on my day off
-Jason
The port is more or a less a transmission Line than a typical Port due to the two 90degree angles and the 2 baffles similar to LC1's.
The Internal dimensions of the enclosure are
18.5x18.5x16.5=5647.125
5647.125/1728= 3.2CuFt ~without the transmission line factored in.
Port dimensions are 2x16.5x25.5 (Tuned to 30hz)
I just want to make sure that I tack on another 5 1/2" of space for the Transmission line to be in so it does not take up the internal volume for the driver. (Since there are baffles in the port design it would take away from the internal air volume correct?)
Suggestions? Comments? Donations to my knowledge account?
~Jason
Replies (7)
P0werLifter on 08/13/2004 04:44:56
4got to add,
External Dimensions are 20x20x18 (without the TransmissionLine) using 3/4" MDF so the question would be do i tack on the 5.5"extra length for the enclosure for the transmission line to be in? So external Dimensions would be 20x25.5x18 and the internal would still be just about the same 3.2cuft for the driver?
If this isnt making much sense im sorry haha Pictures say a thousand words and my scanner isnt working.
~Jason
uochronos on 08/13/2004 05:00:57
from what i understand the port is not counted as part of the internal volume. you would need 3.0cubic feet for your sub plus the port area... although i'm not 100% sure on this that is my understanding. sine with a normal tube port you subtract the port volume from the internal volume.
Chronos
PS
let me know how this box sounds SQ wise i was considering building a similar box for my current sub.
P0werLifter on 08/13/2004 05:30:57
So then i would need to tack on the extra overall length for the enclosure to add in the Transmission line correct? or am i reading it wrong since its late (SEE what car audio does on the brain, cant sleep, cant think straight, all i see is designs, numbers being crunched in my head)
~Jason
PS, Ill let you know how it all turns out and sounds, Im mainly going for SPL but i wanted to try this type of design.
uochronos on 08/13/2004 06:14:34
yes from what i understand you would needto add the length of the port section to the box. that is if this works the same as calculating a tube port which i belive it should... wait for kittle or swez though to be sure...
P0werLifter on 08/13/2004 12:50:47
Alright thanks Chronos, Just wanted to make sure I had it planned correctly on paper before i started cutting all my wood. I'll wait for the others to be 100 positive.
~Jason
swez on 08/13/2004 18:35:13
Yes, you do need to account for the baffles as part of the internal airspace of the enclosure. Just measure each panel (H x W x T) and this will give you the sq in numbers for each baffle.
Example:
H = 18.5"
W= 16.5"
T= 0.75"
18.5 x 16.5 x .75 = 228.9 sq inches per baffle.
This is not your baffle size... but same idea.
Swez
P0werLifter on 08/14/2004 00:29:40
Alright cool Thanks..im pretty sure i had it planned correctly then on paper. So ill go a head and start building it on my day off
-Jason
Copyright ClubKnowledge 2009 * All Rights Reserved
