SnowDrifter Posted August 30, 2013 Report Posted August 30, 2013 From the website: Bass-Reflex box - Car / Hifi60 L + 4 " tube / length 25cmTuning frequency 35Hz By the way port area per cubic foot is a joke. ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444
SnowDrifter Posted August 30, 2013 Report Posted August 30, 2013 You're welcome See that? I used whole words ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444
vw passat Posted August 30, 2013 Author Report Posted August 30, 2013 why it's a joke the port area per cubic foot?
Krakin Posted August 30, 2013 Report Posted August 30, 2013 You're welcome See that? I used whole words 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.
Krakin Posted August 30, 2013 Report Posted August 30, 2013 why it's a joke the port area per cubic foot? People use a rule of thumb that says 12-18 in2/foot. This leads to inaccurate box designs and can be the culprit of port noise at loud volumes. 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.
SnowDrifter Posted August 30, 2013 Report Posted August 30, 2013 why it's a joke the port area per cubic foot? People use a rule of thumb that says 12-18 in2/foot. This leads to inaccurate box designs and can be the culprit of port noise at loud volumes. Port area is based on a combination of box size, tuning frequency, power, cone area, and effective displacement of the woofer (cone area and xmech). The port area per cubic foot rule of thumb only bases it on box size, neglecting all the other things you need to consider. ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444
vw passat Posted August 30, 2013 Author Report Posted August 30, 2013 good information thanks so If I use 12sq in is good for 33hz 2.25ft^3?
Krakin Posted August 30, 2013 Report Posted August 30, 2013 20 square inches. Is the minimum you should go for a tuning of 33Hz. 21 square inches for 35hz. 18 square inches for 30hz. So now no matter what you go with you have no reason to make it smaller than those numbers. 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.
vw passat Posted August 30, 2013 Author Report Posted August 30, 2013 but if u make 2.25 my net volume x 1 x12sq in = 27sq in is that right?
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