This is an ex display unit. It comes in a different packaging and could have slight but unnoticeable scratches consistent with something displayed for a while. The VIBE BlackAir T12S Slimline subwoofer enclosure. The T12s has a unique design in where is has a 8 inch slimline subwoofer located in the rear of the enclosure which is the driving force for the system, on the front of the enclosure is a 12 inch Passive Radiator, or can be known as a drone cone. This additional cone acts like a port thus allowing the enclosure to remain really slim and space saving but delivering an output of a box more than twice its size! When paired with the Powerbox400.1 this package is a deadly combination! Efficient, powerful and robust and the BEST slimline enclosure on the market. Subwoofer Q and A. Q : What is a subwoofer enclosure? A : A subwoofer enclosure is a box designed specifically to house a dedicated subwoofer, there are multiple types of enclosure but primarily used are Ported for SPL and loud bass or Sealed for a sound quality install. Q : Whats Active and Passive? A : An active enclosure is an all in one solution where the subwoofer, amplifier and enclosure are all in one single unit making installation easy and compact. A passive enclosure is a subwoofer and enclosure without an amplifier, these are often louder than an active enclosure but require a separate amplifier to power them. Q : What is a sealed enclosure? The sealed enclosure delivers a wide bandwidth and very accurate bass reproduction. Q : What is a Ported enclosure? The vents are know as ports and vary in size, shape and length in order to give the enclosure a specific tuning frequency range in order to give maximum performance. A ported enclosure delivers a greater sound output than a Sealed enclosure. Q : What is a Passive Radiator? A : A Passive radiator is a subwoofer cone and sometimes suspension that is tuned and weighted to give a tuning bandwidth to an enclosure. Adding a Passive Radiator give the impression of a ported box while still being able to keep the enclosure compact.