Big problem with sub Klipsch R-112 

that appears to be something loose inside the enclosure

the cables (2) going to the membran ar somehow got free. Normally these are sticking to the back of the speaker and just a little piece of these are free to let the speaker moving. It seems in your sub these two cables arent with the membran anymore, they are fully free and they are touching the membran every time it moves big distances when low freqs comes. U can send it back and explain them what the problem really is.

Somthing in the port

had this with my r115, turned out to be a lose cable from the amp

So long story short your sub is fine yes but it's hitting the inside of the magnet because it was not center correctly

Tinsel lead slap is what its called

turn the gain down

No, no it normal :(