A pre-owned product is one that is sold by the owner after he has used it for sometime. It is more like a second-hand product. A good number of audiophiles tell us that they have audio gear that they seldom use anymore (These also happen to be in a great condition). However, before upgrading to new (and often expensive) audio gear, they often wonder what to do with their old gear. Upgrading means more investment in the new gear. It also requires some space in a place already crammed with old gear.  Thus, we began our Trade-Up program where people can list their gear for sale. Once the buyer purchases it, the seller is given store credit which he/she can use to upgrade to his/her next headphone.