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theile small, proper air space


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1990mustang 
Member - Posts: 5
Member spacespace
Joined: October 16, 2005
Location: Canada
Posted: November 29, 2005 at 4:56 PM / IP Logged  
is there certain calculations you need to get the proper airspace when fiberglassing a box?i was told the calculations include the theile smalles.i have fiberglassed before but not complete sub boxes so any info is greatly apprecited thanx
1990 mustang rollin on 18 inch lexani firestars,custom stereo,twin turbo 5 litre
mi_what 
Copper - Posts: 208
Copper spacespace
Joined: April 20, 2005
Location: United States
Posted: November 29, 2005 at 6:24 PM / IP Logged  
Just use the specifications included with your subs; if you're talking about creating the box to the specified airspace, then read the post entitled "Packing Peanut Volume" that should help. I think I understood your question but, if not be sure to say something so we can get you on the right track.
1990mustang 
Member - Posts: 5
Member spacespace
Joined: October 16, 2005
Location: Canada
Posted: November 30, 2005 at 10:39 AM / IP Logged  
ok i read that post and it made some sense but is there no calculations involving the thiele smalles to measure the proper airspace? so i guess you just kinda measure the space your workin with before u start and kinda get a rough estimate for airspace then work with it? i want the whole box fiberglass except the rings and braces. im doing one 12" sub in the drivers side of the trunk in a 2004 acura tsx....any one have ideas or pics?
1990 mustang rollin on 18 inch lexani firestars,custom stereo,twin turbo 5 litre
mi_what 
Copper - Posts: 208
Copper spacespace
Joined: April 20, 2005
Location: United States
Posted: November 30, 2005 at 2:52 PM / IP Logged  
Nice car. Yeah, first get an idea about the cubic feet needed (for one 12 should be less than a cubic foot), build a box that is at LEAST a cubic foot (you can always take away space easier than adding to it).
Build your box, position your sub rings, and staple down the fleece; then take your measurement. It'll be easier to make adjustments without resin and glass on it.
1990mustang 
Member - Posts: 5
Member spacespace
Joined: October 16, 2005
Location: Canada
Posted: November 30, 2005 at 5:24 PM / IP Logged  
ok thanks for the advice i guess its all trial and error.but your right i can always take space away to get the proper tuning.thanx again
1990 mustang rollin on 18 inch lexani firestars,custom stereo,twin turbo 5 litre
jlord16 
Silver - Posts: 322
Silver spacespace
Joined: September 08, 2005
Location: Australia
Posted: December 01, 2005 at 12:39 AM / IP Logged  

1990mustang wrote:
ok i read that post and it made some sense but is there no calculations involving the thiele smalles to measure the proper airspace? so i guess you just kinda measure the space your workin with before u start and kinda get a rough estimate for airspace then work with it? i want the whole box fiberglass except the rings and braces. im doing one 12" sub in the drivers side of the trunk in a 2004 acura tsx....any one have ideas or pics?

The subs specs should tell you the ideal box volume.  If you use the packing peanut method from there onwards to fine tune the box then it will work out good.

Clarion DB36MP
Infinity Kappa Perfect 10"
Respone 800w Mono
ALPINE MRP-F250
*Custom fabrications*

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