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w6 or 2 type r's


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bwhvac065@aol.c 
Copper - Posts: 67
Copper spacespace
Joined: April 05, 2009
Location: Indiana, United States
Posted: April 11, 2009 at 12:37 AM / IP Logged  
ok i have a question since everyone seems to be having a good day.LOL i have six punch p2s 12s how would you measure the cone area?
Blazerspl
6 rockford 12s
5500 watt pa amp
12.0 cubic enclosure
BIG 3
whiterob 
Copper - Posts: 351
Copper spacespace
Joined: July 22, 2007
Location: United States
Posted: April 11, 2009 at 12:43 AM / IP Logged  
bwhvac065@aol.c wrote:
ok i have a question since everyone seems to be having a good day.LOL i have six punch p2s 12s how would you measure the cone area?
Look at the specs of your sub and look for a value that is called "Sd". That is the effective cone area of your sub. Then just multiply that number by 6 and you have the total cone area of your subs.
Otherwise you can just do the area of a circle (A = pi * radius^2) to give you a basic idea. It won't be perfect but it will be close enough.
bwhvac065@aol.c 
Copper - Posts: 67
Copper spacespace
Joined: April 05, 2009
Location: Indiana, United States
Posted: April 11, 2009 at 12:47 AM / IP Logged  
ok thanks. On the equasion above pi is 3.14?
Blazerspl
6 rockford 12s
5500 watt pa amp
12.0 cubic enclosure
BIG 3
bwhvac065@aol.c 
Copper - Posts: 67
Copper spacespace
Joined: April 05, 2009
Location: Indiana, United States
Posted: April 11, 2009 at 12:48 AM / IP Logged  

if not can you possibly do a demo of the correct equasion? either way thanks for your time

Blazerspl
6 rockford 12s
5500 watt pa amp
12.0 cubic enclosure
BIG 3
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: April 11, 2009 at 1:02 AM / IP Logged  
diameter of the driver / 2 = r
(I measure from the center of the surround roll to the opposite center)
EX: a 15" driver, will measure about 13" across, so 13 / 2 = 6.5
3.141592 * (6.5 ^2) = Sd
3.141592 * 42.25 = Sd
3.141592 * 42.25 = 132.73 in^2
132.73 * 6 = 796.4 in^2 of total surface area, for six 15's.
An easier way, though, would be to use the manufacturer's specified Sd, and multiply by the number of drivers you want to use.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
whiterob 
Copper - Posts: 351
Copper spacespace
Joined: July 22, 2007
Location: United States
Posted: April 11, 2009 at 1:03 AM / IP Logged  
bwhvac065@aol.c wrote:

if not can you possibly do a demo of the correct equasion? either way thanks for your time

Yes, pi = 3.1415. Radius^2 means the radius squared.
An example would be...
A = 3.1415 x 5.5^2 = 95 square inches of cone area.
95 x 6 subs = 570 square inches of total cone area.
The 5.5 value refers to a 5.5 inch radius. The cone are will not include the entire sub so I just made up a value that I figured would be close to the radius you would use for a 12" sub.
bwhvac065@aol.c 
Copper - Posts: 67
Copper spacespace
Joined: April 05, 2009
Location: Indiana, United States
Posted: April 11, 2009 at 1:05 AM / IP Logged  
damn that is alot of math i think i will go with the SD. Thanks a million fellas
Blazerspl
6 rockford 12s
5500 watt pa amp
12.0 cubic enclosure
BIG 3
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