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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: 208643" data-attributes="member: 12075"><p>What you say it's correct, but those values are not for the mathematical Xmax (voice coil height-magnetic gap)/2</p><p>Personally I don't like to look at those values I prefer to calculate the mathematical Xmax. Especially when I compare speakers from different manufacturers which can have different formula for calculating Xmax.</p><p></p><p>8NDL51 (17-8)/2=4.5</p><p>8MND51 (16-8)/2=4</p><p>8NW51 (19-10)/2=4.5</p><p>8MBX51 (15-7)/2=4</p><p></p><p>18Sound states in their specs that the 8NMB420 has a "Linear Mathematical Xmax± 5,75 mm (±0,23 in)"</p><p>But they don't give you the voice coil height and the magnetic gap height so you could double check.</p><p></p><p>So for me It's really down tho this to justify that extra 40 EUR/driver for the 8NMB420 over the B&C8NDL51:</p><p>Thus the 8NMB420 really has a mathematical Xmax of 5.75?</p><p>And if it's really 2-3 dB louder than the B&C 8NDL51</p><p></p><p>There are other differences between the two drivers:</p><p>The 8NMB42 has a lighter cone but also a weaker motor and requires a bigger cabinet than the 8NDL51.</p><p>Also the 8NMB420 has an aluminium VC, while the 8NDL51 has a copper VC.</p></blockquote><p></p>
[QUOTE="Robert Kasleder, post: 208643, member: 12075"] What you say it's correct, but those values are not for the mathematical Xmax (voice coil height-magnetic gap)/2 Personally I don't like to look at those values I prefer to calculate the mathematical Xmax. Especially when I compare speakers from different manufacturers which can have different formula for calculating Xmax. 8NDL51 (17-8)/2=4.5 8MND51 (16-8)/2=4 8NW51 (19-10)/2=4.5 8MBX51 (15-7)/2=4 18Sound states in their specs that the 8NMB420 has a "Linear Mathematical Xmax± 5,75 mm (±0,23 in)" But they don't give you the voice coil height and the magnetic gap height so you could double check. So for me It's really down tho this to justify that extra 40 EUR/driver for the 8NMB420 over the B&C8NDL51: Thus the 8NMB420 really has a mathematical Xmax of 5.75? And if it's really 2-3 dB louder than the B&C 8NDL51 There are other differences between the two drivers: The 8NMB42 has a lighter cone but also a weaker motor and requires a bigger cabinet than the 8NDL51. Also the 8NMB420 has an aluminium VC, while the 8NDL51 has a copper VC. [/QUOTE]
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