CountryBeast199 Posted March 13, 2022 Report Share Posted March 13, 2022 I have 4 18" fi sp4 v1's I plan on doing a build with, it's either going to be a folded flat wall or a 4th, the issue I have with the 4th is according to recommended specs they need 4-6cuft per sub sealed but I can only fit around 3cuft per sub sealed, so wasn't sure if that would be enough to use them properly in a 4th order or not Link to comment Share on other sites More sharing options...
Joe X Posted March 13, 2022 Report Share Posted March 13, 2022 This is the in car performance of the Fi SP4 18 in a Qtc= 0.707 box (in yellow) vs a 3 cubic feet in red sealed boxes: So you be the judge, the smaller the rear (sealed) chamber of a 4th bandpass is the less low end you will get. Link to comment Share on other sites More sharing options...
CountryBeast199 Posted March 14, 2022 Author Report Share Posted March 14, 2022 So is the yellow a 4cuft box? Link to comment Share on other sites More sharing options...
Joe X Posted March 15, 2022 Report Share Posted March 15, 2022 4.89 cubic feet. Link to comment Share on other sites More sharing options...
CountryBeast199 Posted March 24, 2022 Author Report Share Posted March 24, 2022 Hmm ok, I'm now debating even doing a 4th, if i do I can squeeze 3.5 per sealed but I may just do another ported wall or a standard box, idk yet Link to comment Share on other sites More sharing options...
Joe X Posted March 24, 2022 Report Share Posted March 24, 2022 Proper airspace for your drivers will always be your best bet and will be louder. Link to comment Share on other sites More sharing options...
kalilac619 Posted March 25, 2022 Report Share Posted March 25, 2022 4 hours ago, CountryBeast199 said: Hmm ok, I'm now debating even doing a 4th, if i do I can squeeze 3.5 per sealed but I may just do another ported wall or a standard box, idk yet You’ll be fine with 3 cuft sealed per sub in a 4th order…those box modeling programs need to be taken with a grain of salt since they don’t actually give a accurate cabin gain response graph….I run a 4th order and mine are in around 3cuft sealed per sub and I absolutely murder the lows compared to what my box program suggested it would be…it was about 3 db off of what I got with actual real world cabin gain 2000 Suburban 6 runs of 2/0 12 timpano audio mids,6 timpana audio tweets and 1 timpano compression horn per door 8 banks of blue Maxwells + 260ah of Yin Long LTOs 2 370 Amp Autotech Alts mids amps 2 Crescendo Skyway 3ks Tweet amp Crossfire 2000.4 sub amp: 4 Crossfire XT 8ks Subs: 8 18 in Crossfires in a 4th order Best Scores at events… 161.6@38hz DBdrag sealed on the dash… 162.54 outlaw…161.14 Meca headrest Link to comment Share on other sites More sharing options...
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