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FI SSD12 frequency response
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<blockquote data-quote="Immacomputer" data-source="post: 4911482" data-attributes="member: 570419"><p>For the bass range? I'm easily flat within +3dB from 20 to 70hz without any EQ and with exception to 22hz in which I could bring that peak down with a little more polyfil. There could be some sharp nulls that I didn't get since I only used 1hz increments but the response was very flat compared to the other enclosures I have had in the car.</p><p></p><p></p><p>I think you are having a problem with understanding what pressure waves really are. Full waves do not need to develop in order for sound to be hear. When you imagine a sine wave, don't think of it as a line that comes out of a driver but as a bunch of air molecules closely bunched together from the start of the waveform (the driver) to the end of 1 cycle (distance will be frequency dependent obviously). Now think of how a sine wave looks. That wavy shape is not a physical description of the sound wave but rather a velocity over distance graph. Each molecule of air is going to be moving with some displacement when there is a sound. Those molecules are not going to shoot from the driver to the end of the wave but they will change their velocities from positive to negative how many times per second that corresponds to the given frequency. If a full wave is developed with no reflections, the half way point will have air molecules that are not moving and basically sit still. At 1/4 wavelength distances, the air molecules there will be highly excited and will alter their velocities but they will have a peak velocity that will be higher than any other portion of the wave.</p><p></p><p>Thinking that way, it's easy to understand why you can still hear frequencies when you're closer than a full wavelength away from the speaker. Even though the wave has not fully developed, the air molecules are still stimulated right from the driver and have some velocity component to it. If the air molecules are stimulated, then your body can be stimulated and you can hear that sound, no matter how close you are (with exception to being right at 1/2 and full sine wave locations given a completely echo free chamber).</p></blockquote><p></p>
[QUOTE="Immacomputer, post: 4911482, member: 570419"] For the bass range? I'm easily flat within +3dB from 20 to 70hz without any EQ and with exception to 22hz in which I could bring that peak down with a little more polyfil. There could be some sharp nulls that I didn't get since I only used 1hz increments but the response was very flat compared to the other enclosures I have had in the car. I think you are having a problem with understanding what pressure waves really are. Full waves do not need to develop in order for sound to be hear. When you imagine a sine wave, don't think of it as a line that comes out of a driver but as a bunch of air molecules closely bunched together from the start of the waveform (the driver) to the end of 1 cycle (distance will be frequency dependent obviously). Now think of how a sine wave looks. That wavy shape is not a physical description of the sound wave but rather a velocity over distance graph. Each molecule of air is going to be moving with some displacement when there is a sound. Those molecules are not going to shoot from the driver to the end of the wave but they will change their velocities from positive to negative how many times per second that corresponds to the given frequency. If a full wave is developed with no reflections, the half way point will have air molecules that are not moving and basically sit still. At 1/4 wavelength distances, the air molecules there will be highly excited and will alter their velocities but they will have a peak velocity that will be higher than any other portion of the wave. Thinking that way, it's easy to understand why you can still hear frequencies when you're closer than a full wavelength away from the speaker. Even though the wave has not fully developed, the air molecules are still stimulated right from the driver and have some velocity component to it. If the air molecules are stimulated, then your body can be stimulated and you can hear that sound, no matter how close you are (with exception to being right at 1/2 and full sine wave locations given a completely echo free chamber). [/QUOTE]
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