BobbyG2 Posted June 17, 2013 Report Share Posted June 17, 2013 Oh somehow I missed the isobaric part, what are your maximum dimensions maybe I can whip something up for you when I get off work in the morning? Oh, and not sure what amp you're going to use, but for isobaric in a t-line I wouldn't feel safe with more than 1,000 watts for the pair on two 1800watt woofers. EDIT: Here's my design for the two 15's, I ended up wrecking my Mountaineer two weeks later so I couldn't build it. http://www.stevemeadedesigns.com/board/topic/1828-quarter-wave-t-line-tutorial-updated/page-56#entry2078967 *New vehicle and system coming soon.* Link to comment Share on other sites More sharing options...
will77530 Posted June 17, 2013 Report Share Posted June 17, 2013 if your trying to do a t-line with 18s its better be going into a van with no seats, dats a big box Link to comment Share on other sites More sharing options...
Yates Posted June 18, 2013 Author Report Share Posted June 18, 2013 if your trying to do a t-line with 18s its better be going into a van with no seats, dats a big box I got a station wagon but I kinda want the back seats Link to comment Share on other sites More sharing options...
Yates Posted June 18, 2013 Author Report Share Posted June 18, 2013 Oh somehow I missed the isobaric part, what are your maximum dimensions maybe I can whip something up for you when I get off work in the morning? Oh, and not sure what amp you're going to use, but for isobaric in a t-line I wouldn't feel safe with more than 1,000 watts for the pair on two 1800watt woofers. EDIT: Here's my design for the two 15's, I ended up wrecking my Mountaineer two weeks later so I couldn't build it. http://www.stevemeadedesigns.com/board/topic/1828-quarter-wave-t-line-tutorial-updated/page-56#entry2078967 SPL FX1-5500 says 2500 watts rms at 2 ohms but im only expecting like 700watts rms each and thanks ill take a look and it would be great if you could draw something up would be most appreciated my max dimensions are Length: 31.1024 inches Height: 21.2598 (can go a bit higher prefer not though) Width 37.7953 Link to comment Share on other sites More sharing options...
Yates Posted June 18, 2013 Author Report Share Posted June 18, 2013 I did my measurement in a T-line calculator this is what i got Driver Specifications: # of Drivers: 1 FS: 37 hertz QTS: 0.6 VAS (Cubic Feet): 1.29605 SD (sq. inches): 113 required Driver Displacement: 0.20 cubic feet Enclosure Specifications: 1/4 Wave Tuning Point: 31.921625071 hertz Port Frequency 1: 43.874228626 hertz Port Frequency 2: 39.461699808 hertz Box Frequency: 41.313832927 hertz Line Volume: 5.251984107 Cubic Feet Recommended Line Volume: -5.069264295 Cubic Feet Chamber Depth (inches): 8.25 X-Sectional Area of Port Front: 61.4172 Sq. Inches Maximum X-Sectional Area: 94.488 Sq. Inches Port Front Width (inches): 3.25 required X-Sectional Area of Port Rear: 94.488 Sq. Inches Maximum X-Sectional Area: 146.4564 Sq. Inches Port Rear Width (inches): 5 required X-Sectional Area of Port Exit: 146.4564 Sq. Inches Minimum X-Sectional Area: 113 Sq. Inches Port Exit Width (inches): 7.75 required Maximum Dimensions: External Height (inches): 21.2598 required External Width (inches): 37.7953 required External Depth (inches): 21.2244 Material Thickness (inches): 1.1811 required Panel Dimensions: Top (Green): 37.7953 X 21.2244 Bottom (Green): 37.7953 X 21.2244 Front Baffle (Orange): 28.8642 X 18.8976 Rear Baffle (Yellow): 37.7953 X 18.8976 Side Panel (Blue): 18.8622 X 18.8976 Side Panel (Red): 20.0433 X 18.8976 Inner Panel 1(Teal): 13.8622 X 18.8976 Inner Panel 2 (Purple): 21.502 X 18.8976 Inner Panel 3 (Pink): 23.252 X 18.8976 Tried to get in as image but don't know how to paste it from a print screen is this a good design oh and heres how the coulars are set out Link to comment Share on other sites More sharing options...
One Way Posted June 18, 2013 Report Share Posted June 18, 2013 The pictures you have above is not a t line, looks more like a folded horn of some kind. I did some quick calculations and came up with: Tline length- 7.63 ft long but let's just round it to 7.5 ft The displacement needed throughout the tline is 226.86 sq in. you can round it down smaller to 226 sq in. That is going to be massive! Just some simple general calculations. T-line build- http://www.stevemead...e-t-line-build/ Link to comment Share on other sites More sharing options...
Yates Posted June 18, 2013 Author Report Share Posted June 18, 2013 The pictures you have above is not a t line, looks more like a folded horn of some kind. I did some quick calculations and came up with: Tline length- 7.63 ft long but let's just round it to 7.5 ft The displacement needed throughout the tline is 226.86 sq in. you can round it down smaller to 226 sq in. That is going to be massive! Just some simple general calculations. 7.63 ft long at what frequency 226.86 Sq inches isnt it the subwoofer area which is 180.4450759 sq inches I don't know tell me if im wrong Link to comment Share on other sites More sharing options...
One Way Posted June 18, 2013 Report Share Posted June 18, 2013 The pictures you have above is not a t line, looks more like a folded horn of some kind. I did some quick calculations and came up with: Tline length- 7.63 ft long but let's just round it to 7.5 ft The displacement needed throughout the tline is 226.86 sq in. you can round it down smaller to 226 sq in. That is going to be massive! Just some simple general calculations. 7.63 ft long at what frequency 226.86 Sq inches isnt it the subwoofer area which is 180.4450759 sq inches I don't know tell me if im wrong The 7.63 ft long is at 37 htz, To my understanding is the fs of the woofer right? And 180 sq. in. Seems too small for the cone area of an 18. I simply used circumference/ 2 X (radius X radius) to get the answer. T-line build- http://www.stevemead...e-t-line-build/ Link to comment Share on other sites More sharing options...
carfreac18 Posted June 18, 2013 Report Share Posted June 18, 2013 I am in no way shape or form a pro at this but I've read up on T-Lines a lot and have always wanted to design one and i just did my best at figuing out the measurements. I just realizd that the mounting depth of your subs won't work in this box the way i put the port but when i get off work today i will try and figure out a different way . but here are the rest of my measurements. if i did something wrong with my calculations please tell me because I really want to learn how to do this the correct way [/url]">http:// [/url]">http:// [/url]">http:// [/url]">http:// 1998 Mustang GT Yellow 5-Speed Manual, Cold-Air Intake, saving up for 4.10 gears in the rear-end. (1) 12" RE Audio SRx and a ported box tuned to about 36 Hz. (4) Memphis Audio 15-PR572V2 Coaxials (1) Set of Rockford Fosgate Punch P1T-S tweeters Link to comment Share on other sites More sharing options...
Yates Posted June 18, 2013 Author Report Share Posted June 18, 2013 I am in no way shape or form a pro at this but I've read up on T-Lines a lot and have always wanted to design one and i just did my best at figuing out the measurements. I just realizd that the mounting depth of your subs won't work in this box the way i put the port but when i get off work today i will try and figure out a different way . but here are the rest of my measurements. if i did something wrong with my calculations please tell me because I really want to learn how to do this the correct way [/url]">http:// [/url]">http:// [/url]">http:// [/url]">http:// I noticed the mounting depth problem I thought I could make some spacers to raise it up some and also take some of the woffer displacement out of the equation thanks your calculations looks good to me but 226 sq inch port ? im not sure? Link to comment Share on other sites More sharing options...
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