Kyblack76 Posted June 4, 2014 Author Report Posted June 4, 2014 gfy SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold
bkolfo4 Posted June 5, 2014 Report Posted June 5, 2014 Air moving in and out of the box helps, but remember that 98% of the power applied becomes heat. Main goal is just to get it away from the coil. If a driver is rated correctly (ratings are the thermal power rating and are true), it should handle that much power even in a sealed box. Over time, the temperature will level out and not get any hotter (assuming the same amount of power is applied). We thermal test amps and radios by placing them in a 1 cuft enclosure, play them at 10% distortion level (slight clipping), wait for the temp to become steady, and then start the testing. I have ejected CDs from radios that you can only handle with gloves on ? Current system: 1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s Previous systems: 2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz. 1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz.
Kyblack76 Posted June 5, 2014 Author Report Posted June 5, 2014 Air moving in and out of the box helps, but remember that 98% of the power applied becomes heat. Main goal is just to get it away from the coil. If a driver is rated correctly (ratings are the thermal power rating and are true), it should handle that much power even in a sealed box. Over time, the temperature will level out and not get any hotter (assuming the same amount of power is applied). We thermal test amps and radios by placing them in a 1 cuft enclosure, play them at 10% distortion level (slight clipping), wait for the temp to become steady, and then start the testing. I have ejected CDs from radios that you can only handle with gloves on THANK YOU My question of PORT AIR MOVEMENT was a joke....... (i thank you all for the retort, but. if the air is just basically stagnant ... well then? THANK YOU Brian SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold
Kyblack76 Posted June 5, 2014 Author Report Posted June 5, 2014 If you played, for a amount of time.. that space OR AIR would become the temp of the let off.. if its just going IN AND OUT, as you all say.. then, that would come up to temp...... and that is what you would see. Guess i see it different that others.... SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold
hispls Posted June 5, 2014 Report Posted June 5, 2014 Woofers primarily cool from air being pushed by the coil. The more the cone is moving the better it cools. All things being equal I've noticed a larger cone with the same motor coil and spiders will not take heat quite as well as a smaller cone. Apart from where box size and tuning effects cone movement this is a red herring. Bear in mind, when a port is working properly it's not puffing air out of it, but vibrating a column of air within the port. This is why we are careful to have more volume of air in the port than the woofer will displace. If you're puffing air out the port you have a leaky sealed box which is generally not desirable. Considering the temperatures where coils melt and epoxies fail an extra 10 degrees for example of air temperature above the outside temps within the box should have very negligible effect on long term thermal handling.
bkolfo4 Posted June 5, 2014 Report Posted June 5, 2014 When you generate 1000+ watts inside a small sealed enclosure, it gets MUCH hotter than 10 degrees above the outside temp. And while air does "vibrate" in the port, air also moves in and out of the port. On the outer side, the exact same air that was pushed out is not going to get sucked back in. It will be mixed with air that was in front of the port. Current system: 1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s Previous systems: 2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz. 1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz.
Karkov Posted June 5, 2014 Report Posted June 5, 2014 When you generate 1000+ watts inside a small sealed enclosure, it gets MUCH hotter than 10 degrees above the outside temp. And while air does "vibrate" in the port, air also moves in and out of the port. On the outer side, the exact same air that was pushed out is not going to get sucked back in. It will be mixed with air that was in front of the port. This^^ but also, every time you stop playing or there is a pause in the bass beat in a song the air going in and out of your port is some what naturally venting and becoming new air (I would imagine). Also, when you say about it's the same air in there and when it heats up it won't cool because it's all the same temp....well does the air coming out your port ever get as hot as your coils? 300-400-500+ nope so it's still always cooling the driver 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
whatusay45 Posted June 19, 2014 Report Posted June 19, 2014 What if you threw a block of dry ice inside the port? It would significantly drop the temperature of the air moving in and out of the port.
Krakin Posted June 19, 2014 Report Posted June 19, 2014 You want the port free of any and all things 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.
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