c.director Posted September 12, 2012 Report Posted September 12, 2012 Well I have decided to do a blow through on my Dakota. While i've made many boxes, never a 4th order. My current setup: 2 sa 12's on sax.1200. A ported box tuned to around 33-34, I love the sound of it. Its time to get my seats back! and hopefully get a little louder in the process From browsing around here I get that basically a 4th order is a ported box on one side and a sealed on the other. So correct me if i'm wrong: (starting out with 2 SA 15's.) Sealed side would be to specs, around 2.5 cubic feet per sub. Ive heard talk of ratio's, but what would the ported side need to be, the recommended 7-8 cubic feet? and then most people tune to around the 45-55 Hz region? What would you recommend tuning to so I get a similar sound to my current box? (a daily musical box) The port would be partially external and of course the part going to the cab. Any help is appreciated! Facebook: http://www.facebook.com/caleb.arnold.9809 YouTube: http://www.youtube.com/user/CustomAudioChannel?feature=watch
IndianaBassHead Posted September 12, 2012 Report Posted September 12, 2012 ported chamber needs to be at least twice the size of the sealed chamber. For a musical box, go with 2:1 ratio. Which would be 5 cu ft sealed, 10 cu ft ported. I am working on a blow through 4th order as well. Good luck! Audio Build Ride: 2002 Chevy Blazer 4 door Head Unit: Pioneer deh-80prs Subs: 4 DC Level 3 15's in a 4th order wall designed by Trent Choate and Jeff Smith Subs Amp: AQ 3500.1 at wired at .5 (soon to be 2) Mids/Highs Amp: Skar 85.4 Mids/Highs: Skar components Electrical: Mechman 270 amp alt, 2 runs of Knu 0 gauge, XS Power d3400, 2 Deka Group 9a31 Build log : http://www.stevemeadedesigns.com/board/topic/167658-indianabasshead-blazer-dc-audio-4th-order-wall-build/ Perfomance Build 2003 Nissan 350z Greddy Twin Turbo, 3" Test pipes with Borla high-flow cats, Crawford Performance Plenum, Greddy E-manage Ultimate ECU Exedy Racing Clutch, Built Motor by Racing Innovations Greddy Over-fender aero kit (1 of 20 ever made), 19" Racing Hart r5 pro wheels 466rwhp Bike 2008 Midnight Blue Kawasaki ZX-14 Stretched 8" and lowered, Brocks Sidewinder exhaust, Power Commander 5
IndianaBassHead Posted September 12, 2012 Report Posted September 12, 2012 Forgot to mention, (and won't let me edit for some reason) with a 4th order you tune the ported chamber a lot higher than normal. For what you want, I would tune at about 46-48 hz. I think that would be about perfect. Audio Build Ride: 2002 Chevy Blazer 4 door Head Unit: Pioneer deh-80prs Subs: 4 DC Level 3 15's in a 4th order wall designed by Trent Choate and Jeff Smith Subs Amp: AQ 3500.1 at wired at .5 (soon to be 2) Mids/Highs Amp: Skar 85.4 Mids/Highs: Skar components Electrical: Mechman 270 amp alt, 2 runs of Knu 0 gauge, XS Power d3400, 2 Deka Group 9a31 Build log : http://www.stevemeadedesigns.com/board/topic/167658-indianabasshead-blazer-dc-audio-4th-order-wall-build/ Perfomance Build 2003 Nissan 350z Greddy Twin Turbo, 3" Test pipes with Borla high-flow cats, Crawford Performance Plenum, Greddy E-manage Ultimate ECU Exedy Racing Clutch, Built Motor by Racing Innovations Greddy Over-fender aero kit (1 of 20 ever made), 19" Racing Hart r5 pro wheels 466rwhp Bike 2008 Midnight Blue Kawasaki ZX-14 Stretched 8" and lowered, Brocks Sidewinder exhaust, Power Commander 5
c.director Posted September 12, 2012 Author Report Posted September 12, 2012 ported chamber needs to be at least twice the size of the sealed chamber. For a musical box, go with 2:1 ratio. Which would be 5 cu ft sealed, 10 cu ft ported. I am working on a blow through 4th order as well. Good luck! Forgot to mention, (and won't let me edit for some reason) with a 4th order you tune the ported chamber a lot higher than normal. For what you want, I would tune at about 46-48 hz. I think that would be about perfect. Thanks man I was just looking through your thread, can't wait to see that lol Facebook: http://www.facebook.com/caleb.arnold.9809 YouTube: http://www.youtube.com/user/CustomAudioChannel?feature=watch
IndianaBassHead Posted September 12, 2012 Report Posted September 12, 2012 ported chamber needs to be at least twice the size of the sealed chamber. For a musical box, go with 2:1 ratio. Which would be 5 cu ft sealed, 10 cu ft ported. I am working on a blow through 4th order as well. Good luck! Forgot to mention, (and won't let me edit for some reason) with a 4th order you tune the ported chamber a lot higher than normal. For what you want, I would tune at about 46-48 hz. I think that would be about perfect. Thanks man I was just looking through your thread, can't wait to see that lol Ya me neither lol, should move A LOT of air. At least I hope so. Audio Build Ride: 2002 Chevy Blazer 4 door Head Unit: Pioneer deh-80prs Subs: 4 DC Level 3 15's in a 4th order wall designed by Trent Choate and Jeff Smith Subs Amp: AQ 3500.1 at wired at .5 (soon to be 2) Mids/Highs Amp: Skar 85.4 Mids/Highs: Skar components Electrical: Mechman 270 amp alt, 2 runs of Knu 0 gauge, XS Power d3400, 2 Deka Group 9a31 Build log : http://www.stevemeadedesigns.com/board/topic/167658-indianabasshead-blazer-dc-audio-4th-order-wall-build/ Perfomance Build 2003 Nissan 350z Greddy Twin Turbo, 3" Test pipes with Borla high-flow cats, Crawford Performance Plenum, Greddy E-manage Ultimate ECU Exedy Racing Clutch, Built Motor by Racing Innovations Greddy Over-fender aero kit (1 of 20 ever made), 19" Racing Hart r5 pro wheels 466rwhp Bike 2008 Midnight Blue Kawasaki ZX-14 Stretched 8" and lowered, Brocks Sidewinder exhaust, Power Commander 5
c.director Posted September 12, 2012 Author Report Posted September 12, 2012 So taking a hint from this: Doing around 3.5 sealed and 7.5 ported tuned to around 46 Hz Leaves me with a port 10x11 and about 10 inches deep. Do these numbers sound good? Or should I bump up the volume a little on both sides? That puts it at about 110 square inches of port. Facebook: http://www.facebook.com/caleb.arnold.9809 YouTube: http://www.youtube.com/user/CustomAudioChannel?feature=watch
c.director Posted September 12, 2012 Author Report Posted September 12, 2012 Can any body confirm those numbers? I hope to start building this weekend. Facebook: http://www.facebook.com/caleb.arnold.9809 YouTube: http://www.youtube.com/user/CustomAudioChannel?feature=watch
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