verynicehowmuch Posted June 13, 2010 Report Share Posted June 13, 2010 I have been looking around at some fourth order bandpass enclosures and it is a little confusing. When building one is there a sealed to vented ratio, how do you know what airspace they need to be, also do you calculate the port differently? Thanks in advance Quote Link to comment Share on other sites More sharing options...
verynicehowmuch Posted June 15, 2010 Author Report Share Posted June 15, 2010 bump Quote Link to comment Share on other sites More sharing options...
verynicehowmuch Posted June 15, 2010 Author Report Share Posted June 15, 2010 can someone please help me? Quote Link to comment Share on other sites More sharing options...
Guest Posted June 15, 2010 Report Share Posted June 15, 2010 i dont know much about 4th orders (or any bandpass system for that matter) but theres no ratio for the sealed and ported chambers. you determine what size they should be and how big the port should be and the tuning by looking at the t/s (thiele/small) parameters...thats all i know. theres calculators out on the internetz for figuring out bandpasses but i dont know how accurate they are. Quote Link to comment Share on other sites More sharing options...
fecupe2001 Posted June 15, 2010 Report Share Posted June 15, 2010 Im not a big expert on bandpass, but, reading a lot i can say that, for daily it´s around 2/1 ratio (2 cubic feets vented per each sealed c/f) , 3/1 and 4/1 are more complex and looking for better numbers, for example, for a pair of 12´s i would use 1.8 c/f sealed chamber and 3.6 vented chamber tune around 50 hz with 20 SQ of port per cubic feet, someone correct me if im wrong... Quote I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion! 2 15" subs and a 2K wired at 1 ohm, http://www.stevemeadedesigns.com/board/topic/167788-fecupe2001-2-15s-on-a-2k-video-on-page-3/ 8 Massive 15" subs and small power, http://www.stevemeadedesigns.com/board/topic/179296-fecupe2001s-8-15s-4th-order-bandpass-wall/ Link to comment Share on other sites More sharing options...
Guest Posted June 15, 2010 Report Share Posted June 15, 2010 Im not a big expert on bandpass, but, reading a lot i can say that, for daily it´s around 2/1 ratio (2 cubic feets vented per each sealed c/f) , 3/1 and 4/1 are more complex and looking for better numbers, for example, for a pair of 12´s i would use 1.8 c/f sealed chamber and 3.6 vented chamber tune around 50 hz with 20 SQ of port per cubic feet, someone correct me if im wrong... i have no idea lulz so disregard my post OP. Quote Link to comment Share on other sites More sharing options...
dwright27 Posted June 16, 2010 Report Share Posted June 16, 2010 For smaller subs ( 10a & 12s ) it's my under standing to use 2:1 ratios for daily. With the bigger woofers (15s & 18s ) it's better to use 3:1 and even 4:1 ratios for daily. With 4th orders you usually tune aroun the resonant frequency of your vehicle iirc. Power us also dependent on the sealer chamber as well Quote 2006 F-150 4 DC XL M2 18's Walled Daily Driver XS Power 4 DC 3.5kw Team DC Team S.P.L. Lot of Audio Technix and 1/0 DC Audio Dealer American Bass Dealer XS Power Dealer Audio Technix Dealer Link to comment Share on other sites More sharing options...
bobonit Posted June 16, 2010 Report Share Posted June 16, 2010 Go to post 75 here: http://www.stevemead..._1entry934293 Ray has links to the tutorials on diysubwoofer.org . Read them in the order he posted them. Quote 97 Maxima SE Bunch of shit going in, check out the build Build Log Link to comment Share on other sites More sharing options...
dwright27 Posted June 16, 2010 Report Share Posted June 16, 2010 Talk to mike singer aka s-saudio. There's quite a few other knowledgable people on the formus who can help as well. Iamamp3pimp, 80inches, all I can think of atm Quote 2006 F-150 4 DC XL M2 18's Walled Daily Driver XS Power 4 DC 3.5kw Team DC Team S.P.L. Lot of Audio Technix and 1/0 DC Audio Dealer American Bass Dealer XS Power Dealer Audio Technix Dealer Link to comment Share on other sites More sharing options...
verynicehowmuch Posted June 17, 2010 Author Report Share Posted June 17, 2010 thanks guys, Sorry I haven't been able to comment back very quickly. work has been kicking my ass the last few days lol. I have been wanting to run some 15"s or 18"s and tune it very low for daily listening and some good flexing. Quote 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.