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Is Cerwin Vega accurate with their xmax numbers? (re: V15DV2)
Is Cerwin Vega accurate with their xmax numbers? (re: V15DV2)
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Old 8th October 2019, 04:04 PM   #21
academia50 is online now academia50  Argentina
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Join Date: Jan 2013
Quote:
Originally Posted by kipman725 View Post
Perhaps a misunderstanding working out whats going in the pictures is part of the fun
What an extravagant way of fun, I prefer something simpler ......
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Old 9th October 2019, 10:39 PM   #22
academia50 is online now academia50  Argentina
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Join Date: Jan 2013
Quote:
Originally Posted by bjorno View Post
No, that's what the Advertised Sd implied when Mapping on the Posted Driver Picture, x-max is Cone Excursion Max and x-max is in Reality always < as the Cone Excursion Max is the limit where above stretching and shrinking(Sd) effects occur.
The Advertised Pictures are often somewhat skewed: Often resulting in less than 1% error that can be ignored.

That is very bad, you are confusing Xmax (linear behavior zone, without mechanical damage) with Xlim. (zone of safe destruction due to mechanical and / or electrical damage)




XMAX/XLIM
Short for Maximum Linear Excursion. Speaker output becomes non-linear when the voice coil begins to leave the magnetic gap. Although suspensions can create non-linearity in output, the point at which the number of turns in the gap (see BL) begins to decrease is when distortion starts to increase. Eminence has historically been very conservative with this measurement and indicated only the voice coil overhang (Xmax: Voice coil height minus top plate thickness, divided by 2). The Xmax figures on this website are expressed as the greater of the result of the formula above or the excursion point of the woofer where THD reahes 10%. This method results in a more real world expression of the usable excursion limit for the transducer. Xlim is expressed by Eminence as the lowest of four potential failure condition measurements: spider crashing on top plate; Voice coil bottoming on back plate; Voice coil coming out of gap above core; or the physical limitation of cone. A transducer exceeding the Xlim is certain to fail from one of these conditions. High pass filters, limiters, and enclosure modeling software programs are valuable tools in protecting your woofers from mechanical failure.


And if you don't agree with this, talk to Eminence, you can send mail to Big Tony. He is a kind person and likes to share knowledge, not like others ...Ok ?

Bye
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Old 9th October 2019, 10:44 PM   #23
academia50 is online now academia50  Argentina
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Join Date: Jan 2013
Oh, I forgot the link so you can confirm my statement.
Xmax/Xlim

Regards.

Understanding Loudspeaker Data | Eminence Speaker
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