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View Full Version : designing 4 18s window line box in a 90 burban ?



brian84corvette
02-27-2014, 01:37 AM
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 (http://stereointegrity.com/index.php?id=60)

since si says the suspension is soft - its power handling is rated at 600w to prevent the sub bottoming out - the coil should handle more power no prob.

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

im thinking 6 to 7 cubes per sub tuned in the 32 range ? am i on the right track with that ?

brian84corvette
02-27-2014, 10:08 PM
anyone care to recomend airspace and tuning hz ?

bgowdy31
02-27-2014, 10:17 PM
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 (http://stereointegrity.com/index.php?id=60)

since si says the suspension is soft - its power handling is rated at 600w to prevent the sub bottoming out - the coil should handle more power no prob.

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

im thinking 6 to 7 cubes per sub tuned in the 32 range ? am i on the right track with that ?

how much power are you running exactly?

Buck
02-27-2014, 10:46 PM
Hey bro, it was me that contacted you on caco.

brian84corvette
02-27-2014, 11:07 PM
o cool thanks buck :)
as for power i dont have the amp i want yet. but im searching for an amp to do 2400 to 2800 at 1 ohm at 14.4 volts
curently i have a saz1500 gen 1 or a crappy hifonics bxi1600 = not enough to run my 4 18s at their potential

brian84corvette
02-27-2014, 11:11 PM
ah i figured how to attach a pic - this is the beast