Xmech for PD 18BR40 - diyAudio
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Old 15th November 2016, 09:37 AM   #1
skogs is offline skogs  Norway
diyAudio Member
Join Date: Oct 2006
Default Xmech for PD 18BR40

Does anyone know how much excursion this driver can take before it suffers mechanical damage?

I am currently running two of them in their own 200L box tuned to 30Hz , with an 8th order LP at 27Hz, driven by 650W each. According to simulations Xmax will be reached with 900W at 45Hz.

If i close one of the two 150mm ports, the tuning lowers to 22Hz. Which will allow me to move the HP-filter to 20Hz. But now Xmax will be reached with 600W at 35Hz. In this scenario the clipping indicator on my TA2400 will no longer be sufficient warning before xmax is reached.

The gap height is 9mm. Does this indicate a Xmech of 18mm?
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