slow240sx Posted August 5, 2011 Report Share Posted August 5, 2011 I got a level 5 18" and just got a new suburban. Was going to try to do a 4th order box for it. My buddy is trying to help me design it. Hes saying to do 1.5 sealed and 4.5 ported to 40hz. Sounds a little small to me, what do you think? I got plenty of room. That was box he built for a 15 and it sounded good and he says it should work with that even though i got 18. Will be running 4000 watts to it. I was thinking 2 sealed and 6 ported but ive only messed with ported boxes. He likes 1 to 3 ratio and ive heard a few of the ones hes built and they seemed to do good. Just looking for a daily use box that can get loud. Quote 99 GMC Suburban 2 Death Penalty 21" 2 Crescendo BC2000 Boston GT-42 Amp 6 Selenium 6w4p 4 Crescendo tweets Hi output cs144 alt Audiocontrol Epic-160 Pioneer DVD head unit Link to comment Share on other sites More sharing options...
6berry Posted August 5, 2011 Report Share Posted August 5, 2011 i dont know for sure but it seems like you would be better off goin with 2 sealed. with a 1:3 ratio it will be very peaky and also i would tune it a little higher than 40 Hz Quote 1999 Audi A4 1.8T::: 4 - DC Level 3 10's in a 4th order Rockford P6002 on Subs for now (3-3.5k coming eventually) MB Quart ONX4.60 for Mids and Highs Boston S50 Components in Front Boston S65 Coaxials in Rear 40 Sq Ft of Second Skin Damplifier Build Thread UBL 1948 Plymouth Link to comment Share on other sites More sharing options...
Team_DC-Derrick Posted August 5, 2011 Report Share Posted August 5, 2011 well, i dont know if this helps, but lvl 5s are roughly 5.5 cubes ported recommended... coming straight from rusty... so i could see that being a decent box, and if your buddy is any good with 4th orders, i would atleast try it, worst that can happen is that you just get a bigger one, right? Quote The DC Integra 3 18s to 6 15 build log Team_DC-Derrick's Youtube Team DC Audio where theres a will theres a wall....... I just realized Steve has reach Voldemort status, over on JP's site he is the one who will not be named....."We dont speak his name over here, fearing it will destroy us" LOL not even in hush tones Link to comment Share on other sites More sharing options...
slow240sx Posted August 5, 2011 Author Report Share Posted August 5, 2011 ive been running it in about 7 feet ported to 30 on the same amps and its been working good in my nissan. amy port area ideas? Quote 99 GMC Suburban 2 Death Penalty 21" 2 Crescendo BC2000 Boston GT-42 Amp 6 Selenium 6w4p 4 Crescendo tweets Hi output cs144 alt Audiocontrol Epic-160 Pioneer DVD head unit Link to comment Share on other sites More sharing options...
matt402 Posted August 5, 2011 Report Share Posted August 5, 2011 id try 2-2.3 sealed & 5-5.5 ported. port area 16-20" per cube & tune in the high 40s or low 50s. Quote Link to comment Share on other sites More sharing options...
dwright27 Posted August 5, 2011 Report Share Posted August 5, 2011 I'd stay 1.75 - 2 cubes sealed. 2.5 at biggest. 5 - 7 cubes sealed. 47 hz tune, 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...
slow240sx Posted August 5, 2011 Author Report Share Posted August 5, 2011 Ok, so how's about 2 sealed, 6 ported tuned to 50 sound? Quote 99 GMC Suburban 2 Death Penalty 21" 2 Crescendo BC2000 Boston GT-42 Amp 6 Selenium 6w4p 4 Crescendo tweets Hi output cs144 alt Audiocontrol Epic-160 Pioneer DVD head unit Link to comment Share on other sites More sharing options...
zfrerichs Posted August 5, 2011 Report Share Posted August 5, 2011 Build it and try it. Quote Roseville, CA Link to comment Share on other sites More sharing options...
mr.p Posted August 6, 2011 Report Share Posted August 6, 2011 1.5 cubes sealed sounds perfect. I would never put 4kw to a 15" sub in 2 cubes sealed ESPECIALLY one with a SHITTON of motor force, unless you like slamming softparts around. Quote DCAUDIO BALLS DEEP Link to comment Share on other sites More sharing options...
Dan2427 Posted August 6, 2011 Report Share Posted August 6, 2011 Why do you tune 4th orders so high? What would happen if you tuned it low like 35hz? I'm new to 4th orders so just like to learn somethin Quote 2003 GMC Yukon Denali Alpine CDA 117 Redoing Mids/Highs 4 Runs of 1/0 Knukonceptz 2+, 2- 4 Deka 9A31's in back (Stock underhood) 250 amp Alt. AQ20K 2 18" Crossfire XS V.2's 12 cubes 33hz 149sq inches of port! Link to comment Share on other sites More sharing options...
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