jfoodstamp Posted December 11, 2015 Report Share Posted December 11, 2015 Just like the title says.... Has anybody ever been let down after using the Minimum port area formula? Ive never used that formula and have always used the 12-16 rule. I only want to build this box once. I've got 2 18" Sundown SA18 and according to that formula says I should use about 206 square. I have enough room for that port but just checking before going any further Link to comment Share on other sites More sharing options...
hdorre Posted December 11, 2015 Report Share Posted December 11, 2015 what formula? edit: nvm, i see now. Whats your port velocity with 206sqin? 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...
ChevyBoy95 Posted December 11, 2015 Report Share Posted December 11, 2015 My rule of thumb is 35-50 for 12's, 65-80 for 15's, and 95-105 for 18's, regardless of box size. I have used the 12-16 many times, and most of my best boxes broke out of the 12-16. Favorite window line box was 19sq in per cube, and current box that is my #1 fav is 19.6 sq in of port per cube Port is better determined off of the amount of air the cone can displace, rather than the size of the box. 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...
jfoodstamp Posted December 11, 2015 Author Report Share Posted December 11, 2015 I don't know how to figure the port velocity... do you have a link to the formula or can you help me find it Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted December 11, 2015 Report Share Posted December 11, 2015 I don't know how to figure the port velocity... do you have a link to the formula or can you help me find it There isn't a formula, you need to use some kind of box modeling software like WinISD, BassBoxPro, Hornresp, etc. You want to keep port velocity under 33 m/sec, and under 26 m/sec would be much better. Lower port velocity is generally better. Though ports can become so long they are difficult to implement in your box so sometimes design compromises have to be made. Also if ports get much over 45" long they can create other problems. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
jfoodstamp Posted December 12, 2015 Author Report Share Posted December 12, 2015 my port will be 26" long on a side that is a total width of 36. Is that too long? Is the only thing that matters is port velocity? Link to comment Share on other sites More sharing options...
hdorre Posted December 12, 2015 Report Share Posted December 12, 2015 Port is better determined off of the amount of air the cone can displace, rather than the size of the box. Yusss.. volumetric displacement 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...
Kyblack76 Posted December 12, 2015 Report Share Posted December 12, 2015 Pretty sure my last build was wicked short. Still played pretty good but got told my numbers where poo by a few. Was around 220 or so. SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
jfoodstamp Posted December 12, 2015 Author Report Share Posted December 12, 2015 So is it your guys opinion that if I keep my vent area around 200 square inches I wont suffer any adverse affects? Link to comment Share on other sites More sharing options...
jfoodstamp Posted December 12, 2015 Author Report Share Posted December 12, 2015 Kybkack76 explain what you mean? Link to comment Share on other sites More sharing options...
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