D-train-13k Posted October 7, 2011 Report Share Posted October 7, 2011 i was reading forever bumpins tutorial on tlines. he says to find the SD/cone area of the sub to measure the outside of the surround across. say 11.5 inches. then divide by two to get radius and do R^2(3.14). i was looking at DC's website and they say the SD of the level 3 12 is 494cm^2. when the formula that he gave only comes out to 103.82 in^2 which is only 263.7 cm^2. so what measurement should i use? the one from the DC website? or what i just calculated. i wanted to use my Alpine type r in a tLine just for practice. but i wanted to make one for the DC since they're numbers were posted on the website. im just trying to understand the concept before i waste time a money on a box like this. 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...
D-train-13k Posted October 7, 2011 Author Report Share Posted October 7, 2011 bump 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...
D-train-13k Posted October 8, 2011 Author Report Share Posted October 8, 2011 bump 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...
IH8PunkRok Posted October 8, 2011 Report Share Posted October 8, 2011 use the spec given by the manufacturer Quote -Matt2005 Dodge Magnum RTJVC KD-AVX1 2 PPI S580.2 Obsidian Audio ST1 Horn Tweeters PRV 8MB450s Audio Legion 3500.1D 2 RE MT 18s 360 ah LiFePO4 BatterySHCA 2/0 155.2 @ 29 hzKicker CVR 15's buildDD 3512e buildMini T-Line Build(6) 8s BuildNightshade 15s Wall BuildMagnum AB XFL 12s BuildNewest Magnum Build Link to comment Share on other sites More sharing options...
D-train-13k Posted October 8, 2011 Author Report Share Posted October 8, 2011 also are you supposed to tune the box to the Fs of your sub for best results or is that for a one not wonder tline 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...
Supercharged DCs Posted October 8, 2011 Report Share Posted October 8, 2011 (edited) I believe one of the woofers on the DC website has an area for SD, but I cannot remember which one. Give me a second and I'll check. It's the Lv3 10 that is incorrect. I'd go with the given manufacturers SD. Using the formula he gave, you are correct in saying it comes out to only 103 inches. But that formula is for finding the area of a flat, 2 dimensional circle. A subwoofer isn't flat, it dips in... So that seems like it would be the reason that the SD is 494. Idk I sucked in geometry lol Edited October 8, 2011 by Supercharged DCs Quote Bassless once again. Can't seem to keep a system for more than a few weeks Saving for a '06 Nissan 350z, look for build around June 2012. Link to comment Share on other sites More sharing options...
IH8PunkRok Posted October 8, 2011 Report Share Posted October 8, 2011 tune to the fs of the sub or higher. depends on your preferences and as far as i know there is no such thing as a one note wonder tline all of them are very musical Quote -Matt2005 Dodge Magnum RTJVC KD-AVX1 2 PPI S580.2 Obsidian Audio ST1 Horn Tweeters PRV 8MB450s Audio Legion 3500.1D 2 RE MT 18s 360 ah LiFePO4 BatterySHCA 2/0 155.2 @ 29 hzKicker CVR 15's buildDD 3512e buildMini T-Line Build(6) 8s BuildNightshade 15s Wall BuildMagnum AB XFL 12s BuildNewest Magnum Build Link to comment Share on other sites More sharing options...
D-train-13k Posted October 8, 2011 Author Report Share Posted October 8, 2011 Alright thank you. The FS on the alpine is close to 28hz buying tuning the box to 30hz with 180sqin of port. The sd of the alpine type r 12 is 480sqin. Port dimensions are interior measurements at 8hx23wx4.3ft long. Does that seem about right? This is my first attempt at a tline. 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...
D-train-13k Posted October 8, 2011 Author Report Share Posted October 8, 2011 Any help? 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...
IH8PunkRok Posted October 8, 2011 Report Share Posted October 8, 2011 (edited) are you doing an 8th wave? because if you are trying a quarter wave your length tunes to 65hz and the sd of a 12 is no where near the 184 sq inches of port you have Edited October 8, 2011 by IH8PunkRok Quote -Matt2005 Dodge Magnum RTJVC KD-AVX1 2 PPI S580.2 Obsidian Audio ST1 Horn Tweeters PRV 8MB450s Audio Legion 3500.1D 2 RE MT 18s 360 ah LiFePO4 BatterySHCA 2/0 155.2 @ 29 hzKicker CVR 15's buildDD 3512e buildMini T-Line Build(6) 8s BuildNightshade 15s Wall BuildMagnum AB XFL 12s BuildNewest Magnum Build Link to comment Share on other sites More sharing options...
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