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Subwoofers
understanding how boxes work..
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<blockquote data-quote="audioholic" data-source="post: 3159620" data-attributes="member: 549629"><p>An ecnlosure creates an 'airspring' behind the cone. This, coupled with the suspension characterisitics of the speaker, will affect the sound characterisitcs of the system. Furthermore, going bu the t/s specs of the driver, enclosure sizes and alignments can be calculated that would give a predictable response.</p><p></p><p>So what this means is, given the proper knowledge of the speaker you are using, you can design/build an enclosure that will tailor its output and frequency response to fit your system's needs.</p><p></p><p>The space, its size and shape, will affect <strong>perceived</strong> system response. Build a sub system, then place it in a concert hall and play it. Now go sit it in your closet and play the same material... it will sound different. Wave interaction from the system is affected by environment, as the sound wavs created by the sub bounce around and interact with each other, it changes the <strong>perceived</strong> sound.</p><p></p><p>The basic difference between sealed and ported boxes is a ported box is designed and built to utilize the sound waves coming off the rear of the cone to reinforce the direct radiating sound coming from the front of the cone. This reinforcement is not linear however, how much it reinforces is dependant on the frequency of the material being played, and the design/tuning of the box. There is also the problem of the front and rear sound waves will always be slightly out of phase with each other, due to the rear waves having further to travel to reach your ears than the front. This problem can be minimalized, but never eliminated, in a ported box.</p><p></p><p>Sealed boxes do not have that delay issue of course (called group delay), but it also lacks the added output boost given by the rear waves in a vented/ported system. Sealed boxes rely solely on direct radiating sound from the speaker cone. As the cone moves in and out in the box, it creates high and low pressure zones inside the box, resisting further cone motion and attempting to return the cone back to its home position.</p><p></p><p>Hope these random thoughts helped.</p></blockquote><p></p>
[QUOTE="audioholic, post: 3159620, member: 549629"] An ecnlosure creates an 'airspring' behind the cone. This, coupled with the suspension characterisitics of the speaker, will affect the sound characterisitcs of the system. Furthermore, going bu the t/s specs of the driver, enclosure sizes and alignments can be calculated that would give a predictable response. So what this means is, given the proper knowledge of the speaker you are using, you can design/build an enclosure that will tailor its output and frequency response to fit your system's needs. The space, its size and shape, will affect [B]perceived[/B] system response. Build a sub system, then place it in a concert hall and play it. Now go sit it in your closet and play the same material... it will sound different. Wave interaction from the system is affected by environment, as the sound wavs created by the sub bounce around and interact with each other, it changes the [B]perceived[/B] sound. The basic difference between sealed and ported boxes is a ported box is designed and built to utilize the sound waves coming off the rear of the cone to reinforce the direct radiating sound coming from the front of the cone. This reinforcement is not linear however, how much it reinforces is dependant on the frequency of the material being played, and the design/tuning of the box. There is also the problem of the front and rear sound waves will always be slightly out of phase with each other, due to the rear waves having further to travel to reach your ears than the front. This problem can be minimalized, but never eliminated, in a ported box. Sealed boxes do not have that delay issue of course (called group delay), but it also lacks the added output boost given by the rear waves in a vented/ported system. Sealed boxes rely solely on direct radiating sound from the speaker cone. As the cone moves in and out in the box, it creates high and low pressure zones inside the box, resisting further cone motion and attempting to return the cone back to its home position. Hope these random thoughts helped. [/QUOTE]
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