Where am I able to find out how big a box should be in order to get decent sound quality out of it. I am making a ported box for a 12' sub. Any help would be appreciated. 
I know there's a forum dedicated to just car audio but for some reason I can't find it. I had it saved as a book mark on my computer but then I reformatted it and didn't save the links 
 
 
 http://nwgme.org
http://nwgme.org
 
what sub, what power do you have, do you want it ported or sealed?
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Caraudioforum.com
Carstereos.org
Carstereo.com
teamssaudio.com
There all good. But I need specs and ill see what I can help you out with
 
 
I will get you some specs later today. I am about to walk out the door for the day. Thanks for the sites 
 
 http://nwgme.org
http://nwgme.org
 
just read your book you got with your sub if you still have it. It will tell you exactly what to build.
 
im currently building a box for my kicker S12L7 and will get pics up asap but if you want sound quality, you want a sealed box thats close to your subs max enclosure vol. ported boxes are only good for lots of deep bass, not to mention a ported box will lower the power handling of your sub. 
many changes in the making
my favorite part about doing bodywork,.......... bondo bugers 
 
Oh I did not know that the port would lower it the power handling. Guess I don't need help with making one anymore lol. Thanks for everyone's help.
 http://nwgme.org
http://nwgme.org
 
Wait? Lower powerhandling? Ported boxes are supposed to make the bass louder at certain frequencies, mainly what the port is tuned to. How does a ported box make the sub louder than if it were in a sealed box and yet reduce the power handling of the sub?
 
and a sealed box will not sound better than a ported one.  if your box is built right and done right then the sound quality will be fine.  just louder. .