bbeljefe Posted August 28, 2013 Report Share Posted August 28, 2013 I don't even know that 8.9 feet is large enough for a 15 with an Fs of 31 hz. Mine for an SA-15 is 9.52 gross and that line is only 8.45' long. A 31hz line would need to be 9' long. Here's the beast.... just painted it last night and still need to buff it: This is it before I finished it, on 1500 watts: https://www.youtube.com/watch?v=6NecVR_8v1c and here's another line I built for a ten: Next up for this truck is two Zv3 15s going in a permanent box in place of the back seat. I was a 6th order fanboi until I read the ¼ wave t-line thread listed above and I'm damn glad I read it, because they are ten times better for SQ and they're louder through a much wider frequency range. If there's any way you can afford the space a t-line takes, I'd say do it! Facebook: facebook.com/audioanarchyllc Instagram: audioanarchyllc Youtube: youtube.com/bbeljefe Link to comment Share on other sites More sharing options...
1two3 Posted August 28, 2013 Author Report Share Posted August 28, 2013 I don't even know that 8.9 feet is large enough for a 15 with an Fs of 31 hz. Mine for an SA-15 is 9.52 gross and that line is only 8.45' long. A 31hz line would need to be 9' long. Here's the beast.... just painted it last night and still need to buff it: This is it before I finished it, on 1500 watts: https://www.youtube.com/watch?v=6NecVR_8v1c and here's another line I built for a ten: Next up for this truck is two Zv3 15s going in a permanent box in place of the back seat. I was a 6th order fanboi until I read the ¼ wave t-line thread listed above and I'm damn glad I read it, because they are ten times better for SQ and they're louder through a much wider frequency range. If there's any way you can afford the space a t-line takes, I'd say do it! beautiful box man!! how did u get that finish? paint and clear? is there a build log by any chance? 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...
1two3 Posted August 28, 2013 Author Report Share Posted August 28, 2013 ok so right now i got 2 15's sealed running off 1200ish watts. if i make a proper t-line box for just 1 15 will i notice a difference in anything? sq or spl? like would it be worth the work and the extra space and money for the box or should i just leaf it? 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 Yes, in a properly built transmission line you will notice very good group delays and SPL gains. 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 Yes, in a properly built transmission line you will notice very good group delays and SPL gains. i know im askin u alot of questions but what are group delays? 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 A way to measure time distortion from when the signal gets sent to the speaker to when the speaker reproduces it. Group delays are a way to measure the slope of the phase response at any given frequency. The delay will change at different frequencies. 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 A way to measure time distortion from when the signal gets sent to the speaker to when the speaker reproduces it. Group delays are a way to measure the slope of the phase response at any given frequency. The delay will change at different frequencies. well...all of what you said is beyond me...thanks tho! i measured my trunk again and the biggest box i can make is 24 x 32wide x 24 giving me 10.4 cubes before displacements. im thinking this is still not enough....i think i will just have to wait until a smaller sub comes my way 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 How fast the sub recreates the signal sent to it in milliseconds. 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 How fast the sub recreates the signal sent to it in milliseconds. so basicly the group delay is the delay in miliseconds it takes to reproduce the signal? in that case im guessing the smaller the group delay the better? 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 Yep If you want to know more this will help. http://en.wikipedia.org/wiki/Group_delay 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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