FroznBeavrBALLs Posted January 6, 2012 Report Share Posted January 6, 2012 I am always thinking of different designs for boxes. And i am thinking i might want more port area than this ported box im about to run now. And i like 4th orders. Everyone i know that has one loves them and they work really well. I had a 15 in a 4th order in my trunk before and loved it. other than the port placement. Now i have 2 lvl 4 12s and im thinking about doing a 4th order for them in my trunk. My idea is to make 3 different boxes 2 sealed for the sealed sections for each sub and 1 common ported box for the ported section of the 4th order. Each sealed chamber would be on each side behind the rear wheel well and the ported section would run down the middle of them with a partial internal/external port. My questions are, whats the best ratios for 4th orders and whats a good tuning frequency for low response? And what a good large port area size? I was thinking close to 20sq inches per cube. Has anyone done 2 12s in a 4th order in a trunk before? I would have some measurements to work with but im outa town and my car is back home. :/ Any input or ideas will be great. Especially from ppl who have done a similar set up before. Quote 2 DC 12" lvl 4s 1 DC 1.2k XS Power S3400 big 3 Alll KNU wire Pioneer HU cheapo Legacy coaxes (just for now) http://www.stevemead...n-sentra-build/ Link to comment Share on other sites More sharing options...
matt402 Posted January 7, 2012 Report Share Posted January 7, 2012 sounds like ur thinking of a box like the 1 in my avatar... =] pm kranny for specs. i dont have em. (u might have to adjust some of the dimensions to fit ur specific car.) Quote Link to comment Share on other sites More sharing options...
FroznBeavrBALLs Posted January 7, 2012 Author Report Share Posted January 7, 2012 ok thanks. thats not exactly what i was thinking but it might work. thanks man. lol Quote 2 DC 12" lvl 4s 1 DC 1.2k XS Power S3400 big 3 Alll KNU wire Pioneer HU cheapo Legacy coaxes (just for now) http://www.stevemead...n-sentra-build/ Link to comment Share on other sites More sharing options...
D-train-13k Posted January 7, 2012 Report Share Posted January 7, 2012 I am always thinking of different designs for boxes. And i am thinking i might want more port area than this ported box im about to run now. And i like 4th orders. Everyone i know that has one loves them and they work really well. I had a 15 in a 4th order in my trunk before and loved it. other than the port placement. Now i have 2 lvl 4 12s and im thinking about doing a 4th order for them in my trunk. My idea is to make 3 different boxes 2 sealed for the sealed sections for each sub and 1 common ported box for the ported section of the 4th order. Each sealed chamber would be on each side behind the rear wheel well and the ported section would run down the middle of them with a partial internal/external port. My questions are, whats the best ratios for 4th orders and whats a good tuning frequency for low response? And what a good large port area size? I was thinking close to 20sq inches per cube. Has anyone done 2 12s in a 4th order in a trunk before? I would have some measurements to work with but im outa town and my car is back home. :/ Any input or ideas will be great. Especially from ppl who have done a similar set up before. 2:1 ratio will give you a broad curve. 20 per is going to be groundpounder so dont expect big numbers. but itll help get down on the lows. and move air. tuning thats low for 4th orders is down in the low 40's wade my box in the truck is tuned to 46 Quote The IrishmanCheck out my build hereXL 4th order wall build logIn Progress:alpine cda HU4th order Bandpass2xl 15's1- ab 400.1 (gonna be two hopefully)4- Crescendo 8's2- xts crecendo supertweeters 2 sq super tweetsMb quart 4.125Mechman 270a alt1- xs D27003- xs XP3000 4- odessey pc1700seller feed back threadhttp://www.stevemeadedesigns.com/board/topic/136418-d-train-13k/ Link to comment Share on other sites More sharing options...
FroznBeavrBALLs Posted January 7, 2012 Author Report Share Posted January 7, 2012 I am always thinking of different designs for boxes. And i am thinking i might want more port area than this ported box im about to run now. And i like 4th orders. Everyone i know that has one loves them and they work really well. I had a 15 in a 4th order in my trunk before and loved it. other than the port placement. Now i have 2 lvl 4 12s and im thinking about doing a 4th order for them in my trunk. My idea is to make 3 different boxes 2 sealed for the sealed sections for each sub and 1 common ported box for the ported section of the 4th order. Each sealed chamber would be on each side behind the rear wheel well and the ported section would run down the middle of them with a partial internal/external port. My questions are, whats the best ratios for 4th orders and whats a good tuning frequency for low response? And what a good large port area size? I was thinking close to 20sq inches per cube. Has anyone done 2 12s in a 4th order in a trunk before? I would have some measurements to work with but im outa town and my car is back home. :/ Any input or ideas will be great. Especially from ppl who have done a similar set up before. 2:1 ratio will give you a broad curve. 20 per is going to be groundpounder so dont expect big numbers. but itll help get down on the lows. and move air. tuning thats low for 4th orders is down in the low 40's wade my box in the truck is tuned to 46 you know im not competing so im not worried about numbers. lol Just trying to understand 4th orders. I know there was a good thread made about them a while ago but idk what section it was in. I figured the Enclosure/Subwoofer section but didnt see it. maybe i over looked it. Quote 2 DC 12" lvl 4s 1 DC 1.2k XS Power S3400 big 3 Alll KNU wire Pioneer HU cheapo Legacy coaxes (just for now) http://www.stevemead...n-sentra-build/ Link to comment Share on other sites More sharing options...
donellk Posted January 7, 2012 Report Share Posted January 7, 2012 Check out the link in my sig for the basics of a 4th order! Quote Team Xtreme Amperage Xtreme Audio Innovations XtremeAudioInnovations.com Facebook.com/xtremeaudio321 basics of a 4th order ~ 1993 Toyota Pickup~ 4 linked c notched bagged Fiberglass door panels (5 speakers per door) Link to comment Share on other sites More sharing options...
FroznBeavrBALLs Posted January 7, 2012 Author Report Share Posted January 7, 2012 Check out the link in my sig for the basics of a 4th order! AHHH yes! this is the thread that i was thinking of! thanks man. Quote 2 DC 12" lvl 4s 1 DC 1.2k XS Power S3400 big 3 Alll KNU wire Pioneer HU cheapo Legacy coaxes (just for now) http://www.stevemead...n-sentra-build/ Link to comment Share on other sites More sharing options...
matt402 Posted January 7, 2012 Report Share Posted January 7, 2012 also look at team spb's builds... he went in depth a bit about 4th orders. Quote Link to comment Share on other sites More sharing options...
donellk Posted January 7, 2012 Report Share Posted January 7, 2012 Check out the link in my sig for the basics of a 4th order! AHHH yes! this is the thread that i was thinking of! thanks man. No prob what ever I can do to help! I love 4th orders =D every chance I get I'm building one! Quote Team Xtreme Amperage Xtreme Audio Innovations XtremeAudioInnovations.com Facebook.com/xtremeaudio321 basics of a 4th order ~ 1993 Toyota Pickup~ 4 linked c notched bagged Fiberglass door panels (5 speakers per door) Link to comment Share on other sites More sharing options...
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