Stable Audio acquired the sole License for the manufacture of the USB2 back in 2012 from the Acoustic developer David Trotter from Pasce - founders of the Mini Rig. 

A highly advanced band pass horn design with very low tuning matched to a robust driver allows unprecedented low frequency reproduction for unrivalled performance in a box of this size. Optimised driver selection allows perfect tuning to seamlessly crossover with the KMT8v2.