Mark:

If you want to really get your couch whacked, get a cat.

Hmmm, perhaps it was one of my cats whacking it when I was listening & the sub isn't as good as I thought.

Actually, I think that leather furniture probably reflects more sound than fabric coverings might. It may react a little more in a tactile sense. I think that I'm babbling now.

And yes, the cord is playing with the goose...

TAM