Curtikins Posted February 11, 2014 Report Share Posted February 11, 2014 I want to build a wall, and I just curious what math goes into building a box or wall, if someone could give me the equations used to find volume, displacement, tuning, ect. I'd greatly appreciate it ! Thanks Link to comment Share on other sites More sharing options...
HHR Ed Posted February 11, 2014 Report Share Posted February 11, 2014 EBP = Fs / Qes 50 or less= best used in a sealed enclosure. 50 - 90= flexible enclosure options. 90 or greater= best used in ported enclosure. Sealed Find alpha:X = (0.70 / Qts)^2- 1 Then calculate enclosure volume:Vb = Vas / X System resonant frequency:Fcb = 0.70 / Qts ( Fs) Ported Enclosure volume:Vb = 15 Vas (Qts^2.87) Theoretical cut-off frequency:F3 = 0.26 Fs (Qts^ -1.4) Tuning frequency:Fb = 0.42 Fs (Qts^ -0.9) Port Length Lv = [1.463 (10^7) ®^2/ (Fb^2) (Vb)] - (1.463) R Ed Lester ShowtimeSPL Host Showtime Electronics Video MarketingMy old Build Loghttp://www.stevemead...08/#entry511451http://www.youtube.com/showtimespl 5 time dB Drag Finalist Last ride 2007 HHR, current dB 153.5 and bass race 149.4 dB. 153.0 dB on music New Ride, 2008 HHR SS. Build under way. Loudest score ever = 171dB 2009 dB Drag Racing, North American Points Champion Link to comment Share on other sites More sharing options...
Curtikins Posted February 11, 2014 Author Report Share Posted February 11, 2014 EBP = Fs / Qes 50 or less= best used in a sealed enclosure. 50 - 90= flexible enclosure options. 90 or greater= best used in ported enclosure. Sealed Find alpha:X = (0.70 / Qts)^2- 1 Then calculate enclosure volume:Vb = Vas / X System resonant frequency:Fcb = 0.70 / Qts ( Fs) Ported Enclosure volume:Vb = 15 Vas (Qts^2.87) Theoretical cut-off frequency:F3 = 0.26 Fs (Qts^ -1.4) Tuning frequency:Fb = 0.42 Fs (Qts^ -0.9) Port Length Lv = [1.463 (10^7) ®^2/ (Fb^2) (Vb)] - (1.463) R None of that really makes sense to me, could you elaborate please Link to comment Share on other sites More sharing options...
hdorre Posted February 11, 2014 Report Share Posted February 11, 2014 Sit down with a pen & paper, along with your sub's T/S specs. You'll make sense of it. Its basic math.. Just substitute the variables with the numbers you're given/find. On 5/8/2011 at 7:38 PM, Kranny said: On 5/8/2011 at 7:35 PM, 'Maxim' said: It hurts me inside when I read stuff like this and remember you're 15 LMFAO so true Mitsubishi 3000GT (Old Build) Headunit: Pioneer 80PRS Frontstage: (2) McLaren Audio MLT-2 Tweeters & (4) PRV Audio MR Series Neo 6.5" Mids Substage: 4 15" Hybrid Subs - Tantric Motors & Sundown Softies Amps: Banda 2.4D Amp (Tweets), American Bass VFL 350.4 (Mids), and (2) Ampere 3800s Electrical :Singer 260A Alt & JY Power Lithium 2005 Chevy Colorado Ext Cab Headunit: Pioneer 80PRS Frontstage: 4 PRV 700Ti Tweets & 6 10" Delta Mids on 3000wrms Substage: 6 Fi BTL 18s in a 4th Order Walkthrough on 3 Wolfram 4500s Electrical: Singer "390" and JY Power My Official Feedback Thread Link to comment Share on other sites More sharing options...
AK bass Posted February 11, 2014 Report Share Posted February 11, 2014 Use Torres if you're lazy like me. "The secret to creativity is knowing how to hide your sources." Albert Einstein Link to comment Share on other sites More sharing options...
HHR Ed Posted February 13, 2014 Report Share Posted February 13, 2014 EBP = Fs / Qes 50 or less= best used in a sealed enclosure. 50 - 90= flexible enclosure options. 90 or greater= best used in ported enclosure. Sealed Find alpha:X = (0.70 / Qts)^2- 1 Then calculate enclosure volume:Vb = Vas / X System resonant frequency:Fcb = 0.70 / Qts ( Fs) Ported Enclosure volume:Vb = 15 Vas (Qts^2.87) Theoretical cut-off frequency:F3 = 0.26 Fs (Qts^ -1.4) Tuning frequency:Fb = 0.42 Fs (Qts^ -0.9) Port Length Lv = [1.463 (10^7) ®^2/ (Fb^2) (Vb)] - (1.463) R None of that really makes sense to me, could you elaborate please No offense, but if the equations are too complicated, why did you ask for them? I'd suggest using an online box calculator like Torres. Or using manufacturer box recommendations. Ed Lester ShowtimeSPL Host Showtime Electronics Video MarketingMy old Build Loghttp://www.stevemead...08/#entry511451http://www.youtube.com/showtimespl 5 time dB Drag Finalist Last ride 2007 HHR, current dB 153.5 and bass race 149.4 dB. 153.0 dB on music New Ride, 2008 HHR SS. Build under way. Loudest score ever = 171dB 2009 dB Drag Racing, North American Points Champion Link to comment Share on other sites More sharing options...
CleanSierra Posted February 13, 2014 Report Share Posted February 13, 2014 EBP = Fs / Qes 50 or less= best used in a sealed enclosure. 50 - 90= flexible enclosure options. 90 or greater= best used in ported enclosure. Sealed Find alpha:X = (0.70 / Qts)^2- 1 Then calculate enclosure volume:Vb = Vas / X System resonant frequency:Fcb = 0.70 / Qts ( Fs) Ported Enclosure volume:Vb = 15 Vas (Qts^2.87) Theoretical cut-off frequency:F3 = 0.26 Fs (Qts^ -1.4) Tuning frequency:Fb = 0.42 Fs (Qts^ -0.9) Port Length Lv = [1.463 (10^7) ®^2/ (Fb^2) (Vb)] - (1.463) R This is a great help, good job Ed. It's good information, all found in one spot. Im not the one you want to try to troll. Just a fyi for you. Link to comment Share on other sites More sharing options...
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