Before I ask anything, I would fist like to wish everyone happy holidays, and hope that the next year will be even better then passing one. As for my question, its just like the topic says, what would a bottoming out sub *Shiva Mach III specifically* sound like? I ask because I recently finished building an EBS Shiva, and at about 10mm excursion one way (I measured, maybe less) I hear this weird noise as if the membrane is hitting something. It doesn't sound like metal, but more as if you put your finger in front of it, and let the membrane hit it. There doesn't seem to be anything in the way that would cause this, so I am assuming that it's reaching the limits, even though the x max one would should be 15mm. If you can add to this, please do, I would greatly appreciate it. And I will post pics of this beauty as soon as I can get a digital camera EDIT: Also, how bad is this? Sometimes at rather high volumes, I cannot hear it unless I am standing very close to the sub, and sometimes just dont notice that it is happening. Happy Holidays everyone!