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Old 10-19-2010, 12:11 PM
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Default how many cuft per 18" sub?

hey CACO, got another question and i've always gotten good feedback and answers on here so here's another one for you.

I'm building custom 18" subs, triple 3/4" slug OEM motors w/3" dual 3 ohm coils and punch hx2 baskets but i've never had 18's and never build an enclosure for them, i've never even heard a system w/ 18's so how much cuft per sub should i use? the subs are gonna be around 1500w rms and 3000 max. should it be vented w/a slot vent or aero? The box for my 15's has 1-8" aero and it rocked. I love low bass but i like to hear all levels too. So help me out with some suggestions on how big this box should be or if there is a site on the www like SSA that has examples of 18" boxes and the size of the box. I like to do my own work and don't want to pay someone to do it for me, i like knowing that I did it all myself but just need a little help with the size of box. Thanks and everyone have a great day
shoot! i forgot one thing. I've been using stock alt w/big 3 upgrade. Should i buy an HO alt and get an additional battery? I'll be using around a 2200 watt rms amp to push the 18's and i have a RF p4004 pushing my components so i'm running 2 amps off a stock alt and 1 battery.

Last edited by beatnbronco; 10-19-2010 at 12:15 PM.
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Old 10-19-2010, 12:15 PM
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have a great day too! lol im waiting for the same answer but mine is going to be fitting in a trunk car. go figure
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Old 10-19-2010, 12:16 PM
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Go as big as you can fit. I prefer 8cu ft per 18". A slot port will be much easier for this big of a box.
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Old 10-19-2010, 12:22 PM
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i had 8 cubes per sub, they were fi bl 18's, tuned to 32hz, and it slammed, had 200+square inches of slot port
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Old 10-19-2010, 12:27 PM
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all subs are different, some 18's like small boxes, some like really REALLy big boxes. If you are not sure go in the middle (6cu.ft.). If it likes small go 4.5cu.ft. if it likes big go 8-10cu.ft.
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Old 10-19-2010, 12:48 PM
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Quote:
Originally Posted by thegreatestpenn View Post
all subs are different, some 18's like small boxes, some like really REALLy big boxes. If you are not sure go in the middle (6cu.ft.). If it likes small go 4.5cu.ft. if it likes big go 8-10cu.ft.
^^this is the best answer so far
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just build the box and sit back and let the bass flex the $hit out of ur ride
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Old 10-19-2010, 12:50 PM
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Quote:
Originally Posted by Hertz5400LincolnLS View Post
^^this is the best answer so far
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Old 10-19-2010, 12:53 PM
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Quote:
Originally Posted by murderedtahoe View Post
Don't roll your eyes at the nuthugging...

I kid, I kid


If you are going to use such little power I would definitely make as much box as you have room for. My 12's are in 6cu./sub, so I'd err to 10cu./sub if possible. Low 30's tuning and beat people to death.
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Old 10-19-2010, 12:57 PM
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Quote:
Originally Posted by thegreatestpenn View Post
all subs are different, some 18's like small boxes, some like really REALLy big boxes. If you are not sure go in the middle (6cu.ft.). If it likes small go 4.5cu.ft. if it likes big go 8-10cu.ft.
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Old 10-19-2010, 03:55 PM
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the area i have avail for box is 18hx52wx31d..i was going to use about 12cuft of that room but wanted to face 2 aero's toward the back but the back of the box is going to be butted up against my tailgate. i guess i could fire the aero's out the sides, there will be about 12" from the sides of the box to the inside panel..just need to get a design together and get on the calculator on 12volt..thanks for the input so far..any ideas about port area or ideas about port design lemme know, i still plan to use 2-8" aero's tho..anybody know how to convert a sketchup model to a pic so i can put it on here for opinions?
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