This was Dynaudio's reference subwoofer a few years back. It's a 12-inch driver being driven by a 250-watt amp. It's set up is done by a remote control making it easy to fine tune from your listening position.
I've been using it as a high-end subwoofer on a 2 channel system. It seamlessly integrated with my small bookshelf speakers in a way I could hear the sub. But turn off the sub and it was obvious it was missing.
Shipping cost will be paid by the buyer. The estimated cost for ground shipping is around $70 plus insurance.