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SupaCrazy 
Member - Posts: 6
Member spacespace
Joined: April 08, 2004
Location: United States
Posted: May 08, 2004 at 2:22 AM / IP Logged  

I have 2 12" L5's i want to put under the backseat of my 2004 ex cab Silverado. I have designed the box and it works out to be about 1.22cuft of air space per sub, but i dont know if the displacement of the sub will off set that or not, so the question is based on the info that came with the subs, it says that they need .88cuft at the min, but it says that the displacement is already worked in. thats where im confused. the displacementfr the 12"L5 is 131.1CuIn. Any help would be great thanks.

Jimmy

Ketel22 
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Silver spacespace
Joined: August 23, 2003
Location: United States
Posted: May 08, 2004 at 2:49 AM / IP Logged  
for an extended cab you should be able to get more air space than that? did you limit the size smaller than the seat it self was... i would suggest trying to achieve at least another 0.75 cuft of airspace before you try too much with those.
Quad L Handyman services
SupaCrazy 
Member - Posts: 6
Member spacespace
Joined: April 08, 2004
Location: United States
Posted: May 08, 2004 at 2:57 AM / IP Logged  

i am trying not to have the box hanging out from under the seat, so i only have about 8" of height and 13" of depth the width is 58" and it is going iver a hump. I can use polly fill to get an extra bit of air space if needed, but i just looked at the website again, and the min box size is even given 13 x 13, 13 x 11.5, 11.5 x 11.5, that only comes out to .88cuin of air and thats not taking in the sub size. so i guess that i should be fine.

stevdart 
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Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: January 24, 2004
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Posted: May 08, 2004 at 10:06 PM / IP Logged  
They do take into account the sub displacement when they give you that minimum number.  So you can make the box  at .88ft3 total air, fill with polyfil, and be fine.  The actual air after the speaker is mounted would then be the difference of .88 less .07586 (speaker displacement) = .804   
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

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