B-stock (or refurbished) refers to anything that has either left our warehouse and was returned, or is new and was marked as b-stock for cosmetic reasons. Sometimes this means the item was used, sometimes it wasn't, but all have been tested and reconditioned.
You can expect minor cosmetic flaws, but the items will be functionally up to spec and are covered by the same warranty as new products (with the exception of those minor cosmetic flaws). Accessories included may be different from new versions, including cables, cases, earhooks, etc.
If a dealer is selling an item as "used", "open box" or "store demo" stock, these items have most likely not been inspected or tested by Audeze. We will consider them all as used for purposes of warranty. While we do offer our normal warranty against manufacturing defects from the date of original sale, we do not warrant any cosmetic flaws or other issues caused by use. Please clarify details with your dealer prior to purchase.