Our patent-pending BIC Rear/All-Channel speakers enable users with 5.1 receivers to upgrade to virtual matrix 6.1 without purchasing a 6.1 receiver. (To do this, hook the left and right rear speakers into the two terminals found on the back of our DV1, DV3, or DV5 speaker) Decrease the number of speakers in your room- Instead of crowding a room with 6 speakers for 6.1, 7 speakers for 7.1, etc., connect two channels from your receiver to a DV1, DV3, or DV5. The DV1, DV3, and DV5 come with gold plated jumper cables and can be used in any channel of a home theatre or music system. The DV3 is available in Black, Silver, or White. Black and white MDF cabinets have a lacquer top and bottom. Silver DV3 has an MDF cabinet with a silver vinyl finish.