Jeremy21291 Posted January 7, 2013 Report Posted January 7, 2013 Hey guys ive got four Vvx 12's with a sk2500 in my trailblazer. Im wanting to do a rebuild to a 4th order. But this is the first one ive tried to do so im sorta lost. I understand the 2:1 ratios and all but the overall design, shape, and tuning im kinda lost. If anyone would be willing to help it would be great. Any info that i need to add please ask. Im wanting to produce some epic lows and have it tuned anywhere from 29-31 hz. thanks guys
CleanSierra Posted January 7, 2013 Report Posted January 7, 2013 You don't tune a 4th order that low. You tune low to mid 40s typically. 2:1 is a good starting point for ratio, but testing is key with a 4th order. Are you in a ported box currently with these subs? Im not the one you want to try to troll. Just a fyi for you.
Tebo Posted January 7, 2013 Report Posted January 7, 2013 If you want a really good design go through ram designs i just finished my box, it is a 4th order with a 2:1 ratio 2.1 sealed and 4.75 ported tuned to 45hz. I dropped the lowpass filter to the lowest setting i can play all of decafs music i want to try to find some lower stuff lowest i have is liike 25-26 and it plays it with authority. 04 dodge dakota ext cab 4x4 excessive amperage 300 amp alt with MONSTER stud =)sundown z v3 15 in a 4th order on aq2200sundown 100.4 2 way active...2 Prv audio 6mb200 & 2 re XXX tweetersdeka intimidatorkenwood x396big 3 1/0 knu wire back to deka intimidator
wmrcs Posted January 7, 2013 Report Posted January 7, 2013 I think you should tune your bandpass to where the impedance of the sealed section is highest... E34 540iT/6
Jeremy21291 Posted January 7, 2013 Author Report Posted January 7, 2013 Yeah there in a 12 cube ported at 30hz. And im not completly sure how to build it. I also forgot to say im wanting to keep my back seats.
Jeremy21291 Posted January 7, 2013 Author Report Posted January 7, 2013 I think you should tune your bandpass to where the impedance of the sealed section is highest... How would i do that? I know how to check impedance but not how to check just the sealed side?
Guest Posted January 7, 2013 Report Posted January 7, 2013 lol thats probably not gonna happen. 4th orders are WAY bigger than standard ported boxes.
wmrcs Posted January 7, 2013 Report Posted January 7, 2013 I think you should tune your bandpass to where the impedance of the sealed section is highest... How would i do that? I know how to check impedance but not how to check just the sealed side? You build the sealed section first and then do an impedance sweep through it. Then you build the loading wall/port. E34 540iT/6
Tebo Posted January 7, 2013 Report Posted January 7, 2013 I just built my box tuned to 45 and hoped for the best and it sounds pretty good to me 04 dodge dakota ext cab 4x4 excessive amperage 300 amp alt with MONSTER stud =)sundown z v3 15 in a 4th order on aq2200sundown 100.4 2 way active...2 Prv audio 6mb200 & 2 re XXX tweetersdeka intimidatorkenwood x396big 3 1/0 knu wire back to deka intimidator
Jeremy21291 Posted January 7, 2013 Author Report Posted January 7, 2013 I was going for a c pillar 4th order wall. That way i could keep back seats. Think this can work at all and me keep them. I cant really lose them as i use the back seat all the time.
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