I recently went from Thiel CS7 to Marten Django XL. I tried for the longest time to find the uograde kit to take my CS7 to CS 7.2 but no luck. The Martens offer the next level up (from the CS7) in terms of air, open, accurate mids and bottomless bass. At least in my system. (NAS, Auralic Altair, Parasound Halo JC2-BP, Bel Canto ref 1000m)
