Here's a vid of the Tantric MD in free air.
http://youtu.be/uKztmhA2F2g
It sounds like the woofer is noisy but I assure you that is the pole vent blowing on the vinyl seat it was resting on. The woofer itself is absolutely silent except for the suspension and that doesn't become apparent until this thing was reaching over 1" of excursion.
I believe it would do every bit of 2 1/2" mechanical and probably remain under Xmax for half of that.
Think I'm gonna pull the trigger on a pair soon.
Sent from my Springfield XD with love!