joey2714 Posted October 22, 2007 Report Share Posted October 22, 2007 I got two fully loaded 15" BTLs and i need to build a new box, Im running one T20001bd to each sub, In a 2007 Ford Explorer. I want to do subs up port back, and with the port in the middle, like where steves is but top to bottom. I like it tuned low, probably 32 hz and my max dimensions are 45W x 23H and 27D. Its going to be 3/4" MDF and lots and lots of glass on the inside, mostly that 29oz mat from tap plastics. Thanks ahead of time. I also want to recess the subs so an extra 3/4" on the top baffle, while still staying under 23" Quote play Moola.com its actually fun and free... click here to join Money games! its just games with free money! Link to comment Share on other sites More sharing options...
01xtreme Posted October 22, 2007 Report Share Posted October 22, 2007 so you are wanting a box like meade build for the MTX 9500's? linky This should serve as a damn good guide for you. Quote My System: Pioneer AVH-P3200BT 4-Dayton 7 inch reference series (front doors) 8-Onkyo 3/4 inch tweeters (dash) 1-Sundown Audio 100.4D (mids/highs) 2-18" BTL's (for now) Crescendo 3kwp (for sale) Complete rebuild coming soon... Link to comment Share on other sites More sharing options...
joey2714 Posted October 22, 2007 Author Report Share Posted October 22, 2007 Perfect i completely forgot about that i havent seen it in like a year lol. How do you calculate that port length tho? Quote play Moola.com its actually fun and free... click here to join Money games! its just games with free money! Link to comment Share on other sites More sharing options...
01xtreme Posted October 22, 2007 Report Share Posted October 22, 2007 Perfect i completely forgot about that i havent seen it in like a year lol. How do you calculate that port length tho? no clue about that bro, sorry. Quote My System: Pioneer AVH-P3200BT 4-Dayton 7 inch reference series (front doors) 8-Onkyo 3/4 inch tweeters (dash) 1-Sundown Audio 100.4D (mids/highs) 2-18" BTL's (for now) Crescendo 3kwp (for sale) Complete rebuild coming soon... Link to comment Share on other sites More sharing options...
joey2714 Posted October 22, 2007 Author Report Share Posted October 22, 2007 alright man well thanks.. anyone else? Quote play Moola.com its actually fun and free... click here to join Money games! its just games with free money! Link to comment Share on other sites More sharing options...
andym85 Posted October 22, 2007 Report Share Posted October 22, 2007 give me a few...and ill throw somethin out... Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
andym85 Posted October 22, 2007 Report Share Posted October 22, 2007 ok..i think i got it for ya... box outer dimensions: 22.25"h x 39.5"w x 26.5"d box inner dimensions: 20"h x 38"w x 25"d that gives u right at 11cubes before any displacement port dimensions: 20"h x 4"w = 80sq" of port area....and make it 14" long port displacement: .8912cft displacement of subs: .42cft net box volume: 11-.8912-.42 = 9.68cubes tuning: 32.265hz Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
Rose-Villian Posted October 22, 2007 Report Share Posted October 22, 2007 The Box for The 9500 Absolutley ROCKED!!! That Was My Cousin's Box that Steve Built.. Quote WWW.OSGINDUSTRIES.COM I LOVE HATER'S Link to comment Share on other sites More sharing options...
joey2714 Posted October 23, 2007 Author Report Share Posted October 23, 2007 shit.. thanks alot amatt!! thats what im gonna use.. for other builds tho, out of curiousity id still like to know how to calculate the port length on that MTX box Quote play Moola.com its actually fun and free... click here to join Money games! its just games with free money! Link to comment Share on other sites More sharing options...
andym85 Posted October 23, 2007 Report Share Posted October 23, 2007 i can post of the general mathematical equation if u like...i made a little program in excel that does it automatically and even figures in sub and port displacement... here is the general equation though: (raising to the half power...i.e. ^.5...thats the same thing as take the square root, thats just how u have to type it in in excel though) Fb = .159*((Av(1.84*10^8)/(Vb(Lv+.823*Av^.5))^.5 Fb = tuning frequency Av = vent area Vb = net volume in cubic inches Lv = effective length of vent effective length = physical length + end correction <---1/2 of the ports width Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.