There is no great stagnation

Tekla Perry reports:

To feel the impact of the [hockey] hits at home, TV viewers will need to purchase the $300 ButtKicker (I kid you not), a gadget that attaches to a chair or couch and uses low-frequency audio signals (the company calls it a silent sub-woofer) to shake the furniture in perfect synchrony to the on-screen action.

There is more here, via David Price.