gotFI? Posted September 28, 2007 Report Posted September 28, 2007 going to build a wall in a 2001 saturn L300 4D with (2) Fi BL 18"s. will be building the box piece by piece inside of the ride. it's a wall of course. how do you measure the internal space in ft3? also, looking to tune @ 30-33 hz. what to do? Quote
zaxfire69 Posted September 28, 2007 Report Posted September 28, 2007 Umm..I might need a second opinion about this, but I will take a stab at it.. Say your box is 40"wide X 30" tall x 20" deep...Take 40x30x20=24000 divide 24000 by 1728=13.89cuft Correct me if I am wrong gentlemen... Now as far as tuning goes that is where I need help at and would hope somebody would help us both out...?? Please... Quote
anubis Posted October 10, 2007 Report Posted October 10, 2007 Umm..I might need a second opinion about this, but I will take a stab at it.. Say your box is 40"wide X 30" tall x 20" deep...Take 40x30x20=24000 divide 24000 by 1728=13.89cuft Correct me if I am wrong gentlemen... Now as far as tuning goes that is where I need help at and would hope somebody would help us both out...?? Please... that sounds right re audio has a L-port calc on their site that would help with tuning Quote 1998 Monte Carlo Z34 Stock HU but have replacement Stock Highs Stock Electrical BTL 18 sitting naked AP1500D
doughboi916 Posted October 10, 2007 Report Posted October 10, 2007 how do you find the cubs if the box is a e-regular shape? Quote
andym85 Posted October 10, 2007 Report Posted October 10, 2007 just gotta divide it up on paper into differetn sections and find out the volume for each section...it might take a little time... Quote i likes me some audio stuff...
andym85 Posted October 10, 2007 Report Posted October 10, 2007 and a wall sounds like a bit much to undertake if u dont even know how to find the volume of ur box, or tuning... im not being mean or anything...im just saying... Quote i likes me some audio stuff...
gotFI? Posted October 10, 2007 Author Report Posted October 10, 2007 and a wall sounds like a bit much to undertake if u dont even know how to find the volume of ur box, or tuning...im not being mean or anything...im just saying... i understand. im taking time and notes. you SMD guys help out alot. will be working on it soon. x fingers Quote
TechSys Posted October 11, 2007 Report Posted October 11, 2007 Can't really help with port tuning as I'm still learning. The formula above is for external cf^3, if I'm reading it right (tired form work). To get internal ft^3 take the thickness of the wood off each side. example: that 40"wide X 30" tall x 20" deep enclosure, using .75" MDF would be... 38.5"w x 28.5"t x 19.5"d. for an internal ft^3 of 12.3821614583 or 12.39 ft^3 Of course I could be wrong. Far too damned tired to use my mind right now. Quote Team Pinnacle / Team SouthEastSPL / Team SoundStream / Team GPI / GPI Sales Rep for Florida and Georgia
andym85 Posted October 11, 2007 Report Posted October 11, 2007 tuning is kinda hard to explain...i just made a kinda complex excel spreadsheet that does all the work for example: outer dimensions: 25.5 x 34.5 x 41.5 inner dimensions: 24 x 33 x 40 (assuming 3/4"wood) Total inner volume before displacement: 18.33cft Port opening: 8 x 26 (which is 208sq" of port area -- or 14.6sq" per cubic foot) Port length: 24" Total sub displacement: .46cft Total port displacement: 3.6cft (this is for a sqare port, not a slot port that uses one box wall as part of the port) Total inner volume after port/sub displacement: 14.24cft Tuning: 33.1 hz there is a formula that i can post if u like...its kinda complicated...but the above is just an example Quote i likes me some audio stuff...
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