90 burban four 18s window line box ? - Car Audio Classifieds!
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Old 02-27-2014, 12:52 AM
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Default 90 burban four 18s window line box ?

i want to build a box for my 1990 suburban - at window line height basicly maby a inch or 3 higher if needed - to house four SI ht 18" d2 subwoofers
Stereo Integrity | HT Subwoofers

since si says the suspension is soft - its power handling is rated at 600w to prevent the sub bottoming out - so id like to engineer that in to my box as a just incase i plan to over power them a tiny little bit as the coils can totaly take more than 600w.

anyhow - i dont have any box making programs on my computer - can you recomend one to me to download free ? ive always just used the rockford website to calculate airspace and i forget where i used a port calc... and id like to do it right this time. im decent at wood craftsmanship so im confident i can build a good box given the right design.... for my aplication = daily driving beating up the block, and the ocasional car show demo

id like subs up - port back - made from the nice birch 3/4" plywood doubled up in certan areas - and plenty strong with bracing wherever needed. im open to port ideas... round / octogon / slot port ext... but id like to ask your opionons on port tuning / as well as net airspace the subs might enjoy in a car stereo environment - as the specs might be more suited for home theater people... si recomended port tuning is 20hz in a 5 to 6 cube net airspace = lol in a viechle
also im a bit lost as to where the frequency slopes might want to get cut off with this perticular subs - as they seem to have a wide range of usable hz

hit me with feedback - id apreciate constructive critisisim as well as ideas
thank you in advance
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Old 02-27-2014, 09:29 PM
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no one wants to recomend airspace and tuning frequency ?

edit - added a pic of the beast
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Last edited by brian84corvette; 02-27-2014 at 11:21 PM.
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Old 03-04-2014, 04:00 PM
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Great buy. I have an 88 and was thinking the EXACT same setup a couple of months ago. The cargo area will be the hardest to deaden as it's hollow from the back door to the taillights. If I didn't have to carry so many people, I could remove my third row and do the same setup.

My idea for mine was 20cubes net @25hz, on a 3500. You'll want to tune fairly low since the suspension is very soft. I was going to do a fairly small port also, about 12sqin per cube to help with back pressure.
Good luck and keep us posted
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