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Low Earth Orbit
DIY Audio
4X8" DIY Mid-High
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<blockquote data-quote="Robert Kasleder" data-source="post: 208647" data-attributes="member: 12075"><p>Thanks for clarifying how 18Sound calculate their Xmax.</p><p>If I use that formula to calculate the B&C 8NDL51 Xmax the I get 6.5mm, B&C specs say 7mm.</p><p>So that means B&C is using a different method.</p><p></p><p>But my conclusion from this is that whit the 18Sound's formula the 8NMB420 having 5.8mm, and the 8NDL51 having 6.5mm, probably the 8NDL51 is beter in this case. The 8NMB420 will have 3dB more, but with larger displacement and less Xmax, which leads to higher distorsions. </p><p>Below is a simulation of displacement with the 8NMB420 and 8NDL51 at program power(1600w for 4 speakers).</p><p>The 8NMB420 has 8mm at 400w. 2x8=19 which is it's max peak to peak excursion.</p><p></p><p>The reason why I'm not looking at the bigger VC drivers is weight. All of them exceed 2 Kg's. And I have to put 4 drivers in one cabinet.</p><p>Of course if weight is not an issue you could get the most powerful 8" driver and have more SPL. </p><p>The only other driver that I could find under 2 Kg's that is louder than the 8NDL51 without exceeding it's Xmax is the BMS 8N519.</p><p>But that cost double compared to the B&C.</p></blockquote><p></p>
[QUOTE="Robert Kasleder, post: 208647, member: 12075"] Thanks for clarifying how 18Sound calculate their Xmax. If I use that formula to calculate the B&C 8NDL51 Xmax the I get 6.5mm, B&C specs say 7mm. So that means B&C is using a different method. But my conclusion from this is that whit the 18Sound's formula the 8NMB420 having 5.8mm, and the 8NDL51 having 6.5mm, probably the 8NDL51 is beter in this case. The 8NMB420 will have 3dB more, but with larger displacement and less Xmax, which leads to higher distorsions. Below is a simulation of displacement with the 8NMB420 and 8NDL51 at program power(1600w for 4 speakers). The 8NMB420 has 8mm at 400w. 2x8=19 which is it's max peak to peak excursion. The reason why I'm not looking at the bigger VC drivers is weight. All of them exceed 2 Kg's. And I have to put 4 drivers in one cabinet. Of course if weight is not an issue you could get the most powerful 8" driver and have more SPL. The only other driver that I could find under 2 Kg's that is louder than the 8NDL51 without exceeding it's Xmax is the BMS 8N519. But that cost double compared to the B&C. [/QUOTE]
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