stingray72 Posted July 9, 2021 Report Share Posted July 9, 2021 I ran the numbers in winisd and found a compromise that gives me decent bandwidth but at the sacrifice of about 3 db spl using my fi sp4 v2.1 18 d2. its almost a 1 to 1 ratio 4th order that is 3.60 sealed and 4.43 ported at 40 hz using a single eight inch big a$$ port and blow right into the cab of the car. This will be powered by my taramps smart 3k at 1 ohm. Now to get it built. SPl requirements are anywhere over 140 db which should be easily achieved. Link to comment Share on other sites More sharing options...
stingray72 Posted July 10, 2021 Author Report Share Posted July 10, 2021 I figured out how to get more airspace for my ported side. I can go around my strut tower on the left side and use all of that space. This will probably get me up to 5 cubic feet net on the ported side and then 3 pounds of polyfill sheets will get me about another .50 for 5.50 cubic feet net ported along with my 3.60 net sealed. The air space i got ported will enable me to use two 8 inch ports with the tuning being 43.6hz. Link to comment Share on other sites More sharing options...
stingray72 Posted July 11, 2021 Author Report Share Posted July 11, 2021 Im going to go with external ports full stock length. It will look funny with 22 inches of ports sticking out but hey thats what we gotta do sometimes. I wonder if ill be able to do a hair trick? Link to comment Share on other sites More sharing options...
stingray72 Posted July 11, 2021 Author Report Share Posted July 11, 2021 Taramps md 8000.1 in my sights for burps at one ohm and 4 ohms daily. (yeah buddy) Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted July 12, 2021 Report Share Posted July 12, 2021 On 7/10/2021 at 4:35 PM, stingray72 said: I figured out how to get more airspace for my ported side. I can go around my strut tower on the left side and use all of that space. This will probably get me up to 5 cubic feet net on the ported side and then 3 pounds of polyfill sheets will get me about another .50 for 5.50 cubic feet net ported along with my 3.60 net sealed. The air space i got ported will enable me to use two 8 inch ports with the tuning being 43.6hz. So do I understand you correctly, do you plan on adding polyfill to your ported side? "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
stingray72 Posted July 12, 2021 Author Report Share Posted July 12, 2021 7 hours ago, Triticum Agricolam said: So do I understand you correctly, do you plan on adding polyfill to your ported side? You no what duhh moment. Your right that only works on the subwoofer if its in there haha. Or i should say on a normal box not a bandpass. Its ok I have better measurements than i thought so i should have enough airspace and if not ill buy another 8 inch big a$$ port and extend my ports more to get a 40 hz tuning on the ported side. Ps...i do plan on using poly fill the loose kind in the sealed section which will be 3.00 cf net and if I use 3.50 pounds. I should get a 3.60 perceived air space for the sub. Link to comment Share on other sites More sharing options...
stingray72 Posted July 12, 2021 Author Report Share Posted July 12, 2021 im going to need those two big aero ports because i ordered a taramps md 8000.1 for full power burps and dialed back for daily listening. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted July 13, 2021 Report Share Posted July 13, 2021 15 hours ago, stingray72 said: You no what duhh moment. Your right that only works on the subwoofer if its in there haha. Or i should say on a normal box not a bandpass. Its ok I have better measurements than i thought so i should have enough airspace and if not ill buy another 8 inch big a$$ port and extend my ports more to get a 40 hz tuning on the ported side. Ps...i do plan on using poly fill the loose kind in the sealed section which will be 3.00 cf net and if I use 3.50 pounds. I should get a 3.60 perceived air space for the sub. Sounds good. Loose polyfill in the sealed side is perfectly fine. Polyfill in the ported side would be very detrimental to output. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
stingray72 Posted July 13, 2021 Author Report Share Posted July 13, 2021 Ok i found out on google that i have 14.9 cubic feet of airspace in the trunk so im thinking im going to go 5 cubic feet sealed and the rest 8.50 to 9.00 ported tuned to 45 hz. Link to comment Share on other sites More sharing options...
stingray72 Posted July 13, 2021 Author Report Share Posted July 13, 2021 7 hours ago, Triticum Agricolam said: Sounds good. Loose polyfill in the sealed side is perfectly fine. Polyfill in the ported side would be very detrimental to output. Ok thanks for pointing out my mistake. Link to comment Share on other sites More sharing options...
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