1two3 Posted August 28, 2013 Report Share Posted August 28, 2013 i was just recently introduced to the idea of a t-line and i kinda like them. anybody have experience desining them that could help me? I have maximum dimentions of 33" wide X 25" Front to back and id like to keep it under 17" high Sub: SSA XCON 15. (i have 2 but am assuming box will have to be way too big for my liking) specs: T/S Specs: Re: 3.7 Fs: 31.3 Qms: 6.11 Qes: .45 Qts: .42 Mms: 268g Vas: 88.4 L Sd: 810 BL: 20.71 SPL: 89.6 1w/1m Xmax: 31mm Amp: RF t1000bdcp. subsonic filter stuck at 28hz Goals: Wanting to keep it an sq sub Let me know what you guys think! Car: 2000 Honda CRV Battery: XS Power D5100R Alternator: Stock 90A Head Unit: Pioneer DEH-X9500BHS Front Speakers: Alpine Type S Rear Speakers: JBL GTO 628's Wires: All Knu 4g. Soon to be 0g. Big 3 in 0g Volt Meter: SMD VM-1 Amps: Rockford Fosgate T400-2, T1000-1bdCP Subs: 2 SSA XCON 15's Sealed Tint: Privacy glass + 5% in the back and 25% in fronts Link to comment Share on other sites More sharing options...
john253a Posted August 28, 2013 Report Share Posted August 28, 2013 Idd get another amp around the 750-1000 with no subsonic As with it tunned at 31 in a 1/4 wave you'll be missing out on everything below 26hz Link to comment Share on other sites More sharing options...
1two3 Posted August 28, 2013 Author Report Share Posted August 28, 2013 Idd get another amp around the 750-1000 with no subsonic As with it tunned at 31 in a 1/4 wave you'll be missing out on everything below 26hz subsonic filter can be turned off. its "stuck" as in non adjustable. below 26hz? how often do u come across 20-25hz in music? Car: 2000 Honda CRV Battery: XS Power D5100R Alternator: Stock 90A Head Unit: Pioneer DEH-X9500BHS Front Speakers: Alpine Type S Rear Speakers: JBL GTO 628's Wires: All Knu 4g. Soon to be 0g. Big 3 in 0g Volt Meter: SMD VM-1 Amps: Rockford Fosgate T400-2, T1000-1bdCP Subs: 2 SSA XCON 15's Sealed Tint: Privacy glass + 5% in the back and 25% in fronts Link to comment Share on other sites More sharing options...
Krakin Posted August 28, 2013 Report Share Posted August 28, 2013 Idd get another amp around the 750-1000 with no subsonic As with it tunned at 31 in a 1/4 wave you'll be missing out on everything below 26hz subsonic filter can be turned off. its "stuck" as in non adjustable. below 26hz? how often do u come across 20-25hz in music? Depends on if you mean business, if so you will. Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
1two3 Posted August 28, 2013 Author Report Share Posted August 28, 2013 Depends on if you mean business, if so you will. care to elaborate? Car: 2000 Honda CRV Battery: XS Power D5100R Alternator: Stock 90A Head Unit: Pioneer DEH-X9500BHS Front Speakers: Alpine Type S Rear Speakers: JBL GTO 628's Wires: All Knu 4g. Soon to be 0g. Big 3 in 0g Volt Meter: SMD VM-1 Amps: Rockford Fosgate T400-2, T1000-1bdCP Subs: 2 SSA XCON 15's Sealed Tint: Privacy glass + 5% in the back and 25% in fronts Link to comment Share on other sites More sharing options...
Steua Posted August 28, 2013 Report Share Posted August 28, 2013 Doing a quick calculation, your max dimensions are too small to fit a proper t-line even if you build it as space efficiently as possible. The volume allowed by your dimensions is roughly 8.1 cubes and the minimum volume for the t-line for the xcon is 8.9 cubes using 3/4" wood with absolutely no wasted space in it which isn't very doable. Depending on the amount of power you use, the roll-off frequency will change. Edit: The volume above is considering the fact that you do constant port are equal to the Sd of the sub (ie. no taper/expanding of the line). '79 El Camino Skar VVX-10 in a t-line tuned to 26 Hz Build log: Here Link to comment Share on other sites More sharing options...
Krakin Posted August 28, 2013 Report Share Posted August 28, 2013 There are quite a bit of songs that have notes that low, and having a t-line would allow you to enjoy those beautiful rumbles of the intestines. But what I mean by meaning business is that in order to get the most out of certain equipment you need to upgrade the bottlenecks in your system. In your case the subsonic filter/amp is that. Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
bumpinTL364 Posted August 28, 2013 Report Share Posted August 28, 2013 I built a t-line for a 12" DCON for my old dorm room. It played cleanly down to about 28hz, and I agree why would you even need to play lower? Mine was tuned at about 32-33hz and slammed on only 300 watts. I can do a design for you if you'd like as well. Check out my (half-finished) build log...never finished the log but the build was completed and I had the setup until I graduated from school. I'd go for it with a smaller woofer or if you can find more space masterbation is free, and even saves you money.sorry but someone had to say itsorry, Jimmy...beat you to it (no pun intended) LOLDON'T get a wife. Best advice I never got, and now it's too late My build: 12" DCON in a dorm room. New/current build: 8" woofer, custom amplifier block, fiberglassed speaker pods Link to comment Share on other sites More sharing options...
1two3 Posted August 28, 2013 Author Report Share Posted August 28, 2013 Doing a quick calculation, your max dimensions are too small to fit a proper t-line even if you build it as space efficiently as possible. The volume allowed by your dimensions is roughly 8.1 cubes and the minimum volume for the t-line for the xcon is 8.9 cubes using 3/4" wood with absolutely no wasted space in it which isn't very doable. Depending on the amount of power you use, the roll-off frequency will change. i can make it bigger id just rather not. how high would the box have to be for it to work? using 45's and bracing where needed. and its a dual 2 so i can have it running at 1400 @1ohm or 800 @4ohms according to the birth sheet Car: 2000 Honda CRV Battery: XS Power D5100R Alternator: Stock 90A Head Unit: Pioneer DEH-X9500BHS Front Speakers: Alpine Type S Rear Speakers: JBL GTO 628's Wires: All Knu 4g. Soon to be 0g. Big 3 in 0g Volt Meter: SMD VM-1 Amps: Rockford Fosgate T400-2, T1000-1bdCP Subs: 2 SSA XCON 15's Sealed Tint: Privacy glass + 5% in the back and 25% in fronts Link to comment Share on other sites More sharing options...
Krakin Posted August 28, 2013 Report Share Posted August 28, 2013 You need to tune a T-line at the Fs of the sub. And for the OP everything you need to know is in this thread. http://www.stevemeadedesigns.com/board/topic/1828-quarter-wave-t-line-tutorial-updated/ Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
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