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<blockquote data-quote="DUAL10S" data-source="post: 7375931" data-attributes="member: 564550">That makes some sense as most of that is over my head.So when comparing the xmax specs of the JL, FI and Massive it would seem Massive&#039;s (peak to peak xmax) although not dishonest - but misleading to make their product look at least as good as the SSD and JL product when it actually has the least amount of linear excursion between the three.I could not find the BL parameter for the JL or the Massive.&nbsp; Even if I did all I would know is which motor was stronger.&nbsp; Starting to get a small understanding of the loss of BL and xmax.Is this why the subs with lots of xmax have a large motor (higher BL)?&nbsp; &nbsp; I notice the&nbsp; FI Q15 (Bl is 19.65) with 28mm xmax and at the other end the FI X15 (Bl is 13.2) with 18mm xmax.&nbsp; This makes sense to me but the FI 15BL (Bl is 22.7) with 18mm.&nbsp; Why not in the 30mm or more range?I know the BL15 is not for the same application as the Q or the X but to derive the xmax the method should be the same especially for the same Company.&nbsp; Not picking on FI as their parameters are some of the few that are available for comparison.&nbsp; If anything that would lead me to purchase from them over mainstream.&nbsp; Just trying to get a better understanding.</blockquote>

[QUOTE="DUAL10S, post: 7375931, member: 564550"] That makes some sense as most of that is over my head. So when comparing the xmax specs of the JL, FI and Massive it would seem Massive's (peak to peak xmax) although not dishonest - but misleading to make their product look at least as good as the SSD and JL product when it actually has the least amount of linear excursion between the three. I could not find the BL parameter for the JL or the Massive. Even if I did all I would know is which motor was stronger. Starting to get a small understanding of the loss of BL and xmax. Is this why the subs with lots of xmax have a large motor (higher BL)? I notice the FI Q15 (Bl is 19.65) with 28mm xmax and at the other end the FI X15 (Bl is 13.2) with 18mm xmax. This makes sense to me but the FI 15BL (Bl is 22.7) with 18mm. Why not in the 30mm or more range? I know the BL15 is not for the same application as the Q or the X but to derive the xmax the method should be the same especially for the same Company. Not picking on FI as their parameters are some of the few that are available for comparison. If anything that would lead me to purchase from them over mainstream. Just trying to get a better understanding. [/QUOTE]

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