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<blockquote data-quote="Crown_amps" data-source="post: 2910129" data-attributes="member: 562002"><p>he type of subwoofer enclosure that was used is called Acoustic Suspension (A.S.). This is often refered to as a sealed box, but there are two possible types of sealed boxes: AS and Infinte Baffle (I.B.). In an A.S. encosure, the air mass within the box acts like a spring and is matched to the springyness or complience of the driver. It pushes the speaker cone in opposition to the cones position relative to the origin. In an I.B. enclosure, the volume of the box is much bigger in relationship to the complience of the driver, causeing the driver to act as if the front of it is in one room and the back is in another completely seperate room. The other two most used enclosure designs are Bass Reflex (vented) or Bandpass. Bass reflex uses a tuned port to couple then energy within the box to the outside, where as bandpass uses a combination of an A.S. and vented box to create a double tuned system. Bandpass systems are usually used in car audio or theater applications because they have a very high efficiency but at the cost of complexity and frequency response. Bandpass subwoofers often sound like they play only one note. Vented boxes are slightly less efficient than bandpass boxes, but they have a better frequency range, usually extending lower than a sealed box. However, below the cuttoff frequency, a vented box will completly decouple cone motion from sound production, resulting in flapping and even possible damage to the driver. An acoustic suspension enclosure is one of the least efficient boxes requireing the most power to get the same volume levels of the vented or bandpass boxes. However, it has the best transient response. Because of the spring action of the internal air mass which fights the speaker movement, the A.S. configured subwoofer can react more quickly than the other main box types. Furthermore, although its frequency response may not extend as low as a vented box, the low frequency rolloff is more gradual and subsonics will not cause any damage in an A.S. box. Best of all, the math and complexity of an Acoustic Suspension enclosure is minimal.</p><p></p><p>Isobaric Driver Configuration</p></blockquote><p></p>
[QUOTE="Crown_amps, post: 2910129, member: 562002"] he type of subwoofer enclosure that was used is called Acoustic Suspension (A.S.). This is often refered to as a sealed box, but there are two possible types of sealed boxes: AS and Infinte Baffle (I.B.). In an A.S. encosure, the air mass within the box acts like a spring and is matched to the springyness or complience of the driver. It pushes the speaker cone in opposition to the cones position relative to the origin. In an I.B. enclosure, the volume of the box is much bigger in relationship to the complience of the driver, causeing the driver to act as if the front of it is in one room and the back is in another completely seperate room. The other two most used enclosure designs are Bass Reflex (vented) or Bandpass. Bass reflex uses a tuned port to couple then energy within the box to the outside, where as bandpass uses a combination of an A.S. and vented box to create a double tuned system. Bandpass systems are usually used in car audio or theater applications because they have a very high efficiency but at the cost of complexity and frequency response. Bandpass subwoofers often sound like they play only one note. Vented boxes are slightly less efficient than bandpass boxes, but they have a better frequency range, usually extending lower than a sealed box. However, below the cuttoff frequency, a vented box will completly decouple cone motion from sound production, resulting in flapping and even possible damage to the driver. An acoustic suspension enclosure is one of the least efficient boxes requireing the most power to get the same volume levels of the vented or bandpass boxes. However, it has the best transient response. Because of the spring action of the internal air mass which fights the speaker movement, the A.S. configured subwoofer can react more quickly than the other main box types. Furthermore, although its frequency response may not extend as low as a vented box, the low frequency rolloff is more gradual and subsonics will not cause any damage in an A.S. box. Best of all, the math and complexity of an Acoustic Suspension enclosure is minimal. Isobaric Driver Configuration [/QUOTE]
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