Whoa, talk about a delayed response on my part. I am putting two of the 18s in my Durango. I have about 15.7^3 of space I can use, I want to shot for 7.5^3 of useable airspace for each sub. Tuning will probably be between 35 and 35... not sure yet though. Still waiting on them to arrive... I heard they shipped them yesterday, but I am not going to call and bug them about it, ill just wait a few days, since they are shipping from Crystal Lake Il, and I am in Rock Island, Il. It will probably take the slow pokes at the Fed Ex terminal a day or two to have those things SWAKed and on the way to me. I am extremely eager to get them. I will probably end up staring at them for a few hours before I even touch them.
displacement of the driver not sweep displacement. 
i used 0.3cuft for my calulation, if it is smaller then i just got tuned a little lower.
as per chad kuypers
"6 cubic feet @30Hz is about the starting point for the 18. Any larger and you dont gain much loudness just a little bit more bottom end. I know a guy that did 4.5cuft @30Hz and it was insanely loud"
as per guy with 4.5@30Hz
"it was insanely loud. it was great for music but lacked a little in the infrabass frequincies for movies and what not"
im doing 6cuft@28Hz in an extended cab B3000.
wangtastic
they started shipping wednesday the 29th (i think the 29th) and if it hasnt shipped yet it will tuesday the 5th of july...or should. there is a message about it if yo ucall ascendant (recorded).
i used 0.3cuft for my calulation, if it is smaller then i just got tuned a little lower.
as per chad kuypers
"6 cubic feet @30Hz is about the starting point for the 18. Any larger and you dont gain much loudness just a little bit more bottom end. I know a guy that did 4.5cuft @30Hz and it was insanely loud"
as per guy with 4.5@30Hz
"it was insanely loud. it was great for music but lacked a little in the infrabass frequincies for movies and what not"
im doing 6cuft@28Hz in an extended cab B3000.
wangtastic
they started shipping wednesday the 29th (i think the 29th) and if it hasnt shipped yet it will tuesday the 5th of july...or should. there is a message about it if yo ucall ascendant (recorded).
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