Wicks Posted July 3, 2014 Report Share Posted July 3, 2014 Sweet project! Tuned in to see where this goes! This post sent with 100% recycled electrons. 2004 BMW M3Mechman 280A 2 - XS Power XP30001 - XS Power D375 500F of Maxwell SuperCaps (soon to be 1000F) iPadMini2Dash mounted O-scopeAudison bitOne (Remote DRC MP) Highs Amp - PPI Art A404 Hertz HSK130 (HSK165 waiting...) DC Audio DC9.0K 2- DC Audio XL12m2LEGAL - 147.3dB @ 41Hz OUTLAW - 150.2dB @ 45Hz OUTLAW - 145.7dB @ 30Hz JUNE 2014 SOTM WINNER 2014 COLORADO PEOPLE'S CHOICE WINNER SOTM BUILD:http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026 Link to comment Share on other sites More sharing options...
Krakin Posted July 3, 2014 Author Report Share Posted July 3, 2014 Sweet project! Tuned in to see where this goes! I really can't do much more until I get an RTA. With an RTA I'll be able to design crossovers and get new baffle designs rolling out. I got a cheap one on my phone and I'm using my mic I got with the radio and it appears to have around a -3 or -6 dB/octave slope between 250-500 Hz. 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...
Wicks Posted July 3, 2014 Report Share Posted July 3, 2014 Sweet project! Tuned in to see where this goes! I really can't do much more until I get an RTA. With an RTA I'll be able to design crossovers and get new baffle designs rolling out. I got a cheap one on my phone and I'm using my mic I got with the radio and it appears to have around a -3 or -6 dB/octave slope between 250-500 Hz. Keep me posted on the RTA. I want to get one myself to tune my 360.3. What where you using for the circuit simulator? Looks interesting. I'd like to look into that myself, to try some sample circuits. This post sent with 100% recycled electrons. 2004 BMW M3Mechman 280A 2 - XS Power XP30001 - XS Power D375 500F of Maxwell SuperCaps (soon to be 1000F) iPadMini2Dash mounted O-scopeAudison bitOne (Remote DRC MP) Highs Amp - PPI Art A404 Hertz HSK130 (HSK165 waiting...) DC Audio DC9.0K 2- DC Audio XL12m2LEGAL - 147.3dB @ 41Hz OUTLAW - 150.2dB @ 45Hz OUTLAW - 145.7dB @ 30Hz JUNE 2014 SOTM WINNER 2014 COLORADO PEOPLE'S CHOICE WINNER SOTM BUILD:http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026 Link to comment Share on other sites More sharing options...
Krakin Posted July 3, 2014 Author Report Share Posted July 3, 2014 Keep me posted on the RTA. I want to get one myself to tune my 360.3. What where you using for the circuit simulator? Looks interesting. I'd like to look into that myself, to try some sample circuits. MultiSim One of the cheaper simulators coming in at around $5K a year. 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...
Krakin Posted August 6, 2014 Author Report Share Posted August 6, 2014 One problem that is very apparent in dipole systems is the affects of baffle diffraction. Baffle diffraction is what happens when sound waves hit the edge of a baffle. In this picture you can see the arrows that represent the direction of sound waves, as these sound waves hit a corner what happens is known as baffle diffraction, when this happens you can see the interference that happens. You can see it when the sound reaches the end of the tweeter and the edge of the cabinet. In this animation you see how the diffracted sound starts to interfere with the direct waves. One way you can counteract baffle diffraction is to have a curved edge, such as a round-over. As the sound progresses it hits less hard angles which lessen the ability of it to diffract. As the frequency changes you get different patterns in the nodes and anti-nodes on the baffle, this video illustrates this very well. Now in dipole designs you have sound radiating from both sides of the baffle. This dramatically changes the frequency response of the speakers. This is the affects on the frequency response on a 12"x12" baffle using a single 6.5" speaker in the center. When using the same size speaker and baffle in a dipole configuration the affects are much worse, this is a graph of the frequency response caused by baffle diffraction on my setup at 12"x12" with my 6.5" speaker. Notice how the peaks and valleys are much larger, along with the bass becoming non-existent. I haven't yet figured out an ideal baffle for my speakers, but it appears that having two speakers on a large rectangular baffle will help the affects. I'll post more about this in the future as I learn more. 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...
Krakin Posted August 6, 2014 Author Report Share Posted August 6, 2014 Now that I have plotted the response of my mid range I have plotted the response of my tweeter. Please note that the mid and tweeter are crossed over at around 3500 Hz along with the tweeters being in a mono-pole design as the tweeters are sealed and do not have a backwards radiation. From about 4 KHz to 7 KHz there is a dip in response. However, the response from there on out is very nice. To give an idea of how different shapes affect baffle diffraction here is a list along with graphs of 10 different shapes. The dimensions for the shapes are listed somewhere, but I must have missed them. 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...
Karkov Posted August 7, 2014 Report Share Posted August 7, 2014 At half my age you're twice as smart. Man I love this project! 2007 Chevy Tahoe (SOLD) 12 ~ FI Audio X series 10" w/BP option 2 ~ DC Audio 5.0K @0.67 3 ~ DC Audio 5.0K @1.0 2 ~ PPI 3 way sets (not installed yet) 1 ~ RF T400-4, 1 ~ RF T600-2, 1 ~ RF T600-4 4 ~ CT Sounds 5.25" Strato comps (rear fill only) 1 ~ XS Power D4800 1 ~ XS Power D3400 8 ~ XS Power XP3000 160 stock alt, Mechman 370 Elite, 185 DC Power 320+ Sq. Ft. Sound Deadener Pioneer AVH-X5500BHS Youtube: https://www.youtube.com/user/knfjdkghjudfhsgkjdhf/videos?sort=dd&view=0&shelf_id=0 Link to comment Share on other sites More sharing options...
Krakin Posted August 8, 2014 Author Report Share Posted August 8, 2014 At half my age you're twice as smart. Man I love this project! Thank you very much! Now that I have found how to calculate the diffraction better I feel more confident to go ahead and buy lower-vocal drivers and try and come up with new a new design for the baffles. 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...
TRTC360 Posted December 1, 2014 Report Share Posted December 1, 2014 I do not understand this at all lol '93 Firebird Formula V8 H/U- Kenwood eXcelon KDC-X395 Mids/Highs Amp- Hifonics ZXI80.4 Wiring-KNU RCA's, Speaker Wire, And Two Runs Of Trystar 1/0 G34 Red Top and a 180amp Ford Alternator www.youtube.com/TRTC360 Link to comment Share on other sites More sharing options...
Krakin Posted December 1, 2014 Author Report Share Posted December 1, 2014 I do not understand this at all lol Ahh, you reminded me how much I want to start on the lower mid-range/mid-bass portion of this project! I still haven't even decided on any drivers for it yet, or the size I want. 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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