MrEwubbsZ Posted March 27, 2011 Report Share Posted March 27, 2011 I have 2 18" btls with 2 AQ3500s. and i want to build a "wall" in the back of my ranger for them. the room i have is about 36" high 15" deep and 48" wide. Im not looking for someone to design it for me. i want to learn and understand how the ports work. I see that its there slot or aero port. and i was going to do a slot port towards the top with the subs at the bottom. im using the cal. that torres made and i dont understand what the woofer displacement or brace displacement means. i know i probably got myself in way over my head if i want it tuned to anything but now i have to learn and this seems like a awesome place to learn. Thanks for any help. Quote 2000 Ranger Build Log Link to comment Share on other sites More sharing options...
Skrilla Posted March 27, 2011 Report Share Posted March 27, 2011 (edited) Woofer displacement is the room the sub will take up inside the box. A 18" BTL has a displacement of .18 cuft. Two of them is .36. So you have to take that into consideration for the box size and tuning. So if you had a 10 cuft box before the displacement, than after the two BTL's displacement (.36) you would have a box that's 9.64 cuft. Same thing applies for brace displacement. Say you have two 2x4 running from front to back that are 20" long. Thats .18 cuft of displacement you also have to take into consideration. So your 10 cuft box now becomes 9.46 cuft. The slot port on top and subs below will work good... Edited March 27, 2011 by Skrilla Quote 2 HDC3 18's AQ2200D Link to comment Share on other sites More sharing options...
blownengine Posted March 27, 2011 Report Share Posted March 27, 2011 Wait is this your first build and your doing two 18's? Damn Quote 2003 Dodge Ram 1500 SLT (Yea its got a Hemi)Alpine CDA-105KnuKonceptz 0ga CCA Big 3 with Yellow Top 15" SoundQubed HDC3DC Audio 1.2K (Bass)Pioneer 6x9's (Front)Pioneer 6.5's (Rear)Kicker 3.5's (Dash)Sony amp on the highs. (Hey it was free) Link to comment Share on other sites More sharing options...
Skrilla Posted March 27, 2011 Report Share Posted March 27, 2011 Go big or go home I suppose. Quote 2 HDC3 18's AQ2200D Link to comment Share on other sites More sharing options...
bass_stalker Posted March 27, 2011 Report Share Posted March 27, 2011 Wait is this your first build and your doing two 18's? Damn yeah pretty common my first build is gonna be the dp 21 lol. sorry im not much of a help with the box tho Quote JEEP BUILD PROJECT ANTIBLING.2000 jeep Cherokee.HEADUNITAlpine Cda-9886SUBSTAGE1 acendent 18" audio mayhem motor with a TI basket and tantric parts1 prototype DAT hellfire 1000.1HIGHSStockELECTRICALdb link 0 gaugeKnuconceptz Kolossus 4 gauge1 xs power d3400 under hoodBig 3 upgradeold fourwheeler build The only way to delete your SMD account is for you crawl to steve meades door step on your knees and pleade for his forgiveness and acceptance to be released...He will either grant your wishes.....or choke you with a large piece of 0 gauge and electrocute you by hooking up a solid gold DC 12k at 0.000001 ohm and 10000 volts to your eye sockets and blow your head apart You guys act like you have never clogged a toilet and ran around the bathroom frantically hoping it don't overflow. Link to comment Share on other sites More sharing options...
MrEwubbsZ Posted March 27, 2011 Author Report Share Posted March 27, 2011 Woofer displacement is the room the sub will take up inside the box. A 18" BTL has a displacement of .18 cuft. Two of them is .36. So you have to take that into consideration for the box size and tuning. So if you had a 10 cuft box before the displacement, than after the two BTL's displacement (.36) you would have a box that's 9.64 cuft. Same thing applies for brace displacement. Say you have two 2x4 running from front to back that are 20" long. Thats .18 cuft of displacement you also have to take into consideration. So your 10 cuft box now becomes 9.46 cuft. The slot port on top and subs below will work good... wow that really clears alot up. thanks for making that cut and dry. i see alot of people talking about fiberglassing the inside. Thats just for extra strength? and are 2x4s the way to go when bracing? Quote 2000 Ranger Build Log Link to comment Share on other sites More sharing options...
Skrilla Posted March 27, 2011 Report Share Posted March 27, 2011 If you do it right fiberglassing will make the box stronger. A lot of people use resin too, but most people use it to make sure the box is nice and sealed up rather then stronger. resin is a great way to make 45 degree angles on all your corners, too. There are many types of bracing you can use, the 2x4 was just an example. Some people even use steel rods. I'm not sure how big you're going to make your box, but some 2x4's would be some very strong bracing... Quote 2 HDC3 18's AQ2200D Link to comment Share on other sites More sharing options...
kirill007 Posted March 27, 2011 Report Share Posted March 27, 2011 fiberglassing means using resin and fiberglass... 2x4's are a easy way to brace, but they obstruct airflow, find the thickest wooden dowels and use those as braces. Its a cheap and easy way. Quote Thinking is the root of all problems... You ALWAYS get what you pay for. Link to comment Share on other sites More sharing options...
ChevyBoy95 Posted March 27, 2011 Report Share Posted March 27, 2011 fyi, with those dimensions, the most cubic feet your going to get is 12.53 cubes, before subs, bracing, or anything and only .75 thick. i think btls need anywhere from 5-8cubes ea. Quote Best Score to Date : 160.5 dB Outlaw (47Hz)[4 XM 15's & 2 Taramps Bass 12k's] BL : http://www.stevemeadedesigns.com/board/topic/147800-chevyboy95s-4-15s-7krms-wall-1533-db-on-half-power/YouTube: http://www.youtube.com/hitemwiththeflex/ Link to comment Share on other sites More sharing options...
MrEwubbsZ Posted March 27, 2011 Author Report Share Posted March 27, 2011 fyi, with those dimensions, the most cubic feet your going to get is 12.53 cubes, before subs, bracing, or anything and only .75 thick. i think btls need anywhere from 5-8cubes ea. There site say anywhere from 4-10Cu ft Quote 2000 Ranger Build Log Link to comment Share on other sites More sharing options...
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