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<blockquote data-quote="audioholic" data-source="post: 7375990" data-attributes="member: 549629">We just talked about this the other day, but its worth discussing again.The majority of distortion a speaker creats is BL distortion. BL is, basically speaking, the motor force of the speaker. BL distortion is distortion that is caused when BL is lost as the coil moves and exits the sweet spot in the magnetic field the motor generates. In other words, the further the coil/cone excurts, the less force the motor has on it, so loss of cone control occurs. Less cone control from less motor force means higher distortion levels. This would imply that the speakers with the highest BL ratings would have the least distortion and highest xmax potential, but that is not the case.BL is rated in a static fashion. But BL is not static. As I said above, BL changes depending on the position of the coil within the gap (or outside it). So one sub might be rated for a higher BL than another speaker, but loses it faster as the coil/cone moves. A fairly recent development in speaker tech is BL optimization, which is the process of utilizing various methods to maintain constant BL throughout the cone/coil&#039;s motion limits. Typical motor designs like the tradition overhung type have a BL &#039;curve&#039;, while BL optimized drivers have a flat &#039;curve&#039;. Flat meaning BL stays constant. The advantage of a linear BL curve, if you haven&#039;t guessed already, is constant cone control no matter how much excursion is occurring. Less distortion. This is why you cannot look at one individual spec like BL, and derive too much useful information about the over all performance of a speaker. A single t/s spec can almost never be looked at without considering other t/s specs to see the big picture. BL is no exception, as is xmax.Hope that helps.</blockquote>

[QUOTE="audioholic, post: 7375990, member: 549629"] We just talked about this the other day, but its worth discussing again. The majority of distortion a speaker creats is BL distortion. BL is, basically speaking, the motor force of the speaker. BL distortion is distortion that is caused when BL is lost as the coil moves and exits the sweet spot in the magnetic field the motor generates. In other words, the further the coil/cone excurts, the less force the motor has on it, so loss of cone control occurs. Less cone control from less motor force means higher distortion levels. This would imply that the speakers with the highest BL ratings would have the least distortion and highest xmax potential, but that is not the case. BL is rated in a static fashion. But BL is not static. As I said above, BL changes depending on the position of the coil within the gap (or outside it). So one sub might be rated for a higher BL than another speaker, but loses it faster as the coil/cone moves. A fairly recent development in speaker tech is BL optimization, which is the process of utilizing various methods to maintain constant BL throughout the cone/coil's motion limits. Typical motor designs like the tradition overhung type have a BL 'curve', while BL optimized drivers have a flat 'curve'. Flat meaning BL stays constant. The advantage of a linear BL curve, if you haven't guessed already, is constant cone control no matter how much excursion is occurring. Less distortion. This is why you cannot look at one individual spec like BL, and derive too much useful information about the over all performance of a speaker. A single t/s spec can almost never be looked at without considering other t/s specs to see the big picture. BL is no exception, as is xmax. Hope that helps. [/QUOTE]

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