Hi Photon46 & probably others.
I live on the other side of the earth.
I have never ever heard anyone around me ever use the term 'bad-ass'.
I assume it means something like exciting, impressive, special, extraordinary, spectacular, with a hint of unusual.
But, as I say I am both a foreigner and a culturally different person even though I am an audiophile.
So, if I have got it wrong I apologise.
I did my best in my two posts to contribute to the thread with what I considered to be relevant & interesting posts.
Hope people enjoyed them anyway.