In the frame sets (specifications) for AVn-60b and AVn-48b please *add* the following (leave the original specs &gt;&gt;&gt;AVn-60b Mk-I.v2 (bridge) 6.3K-ohms; Resonance 2.9KHz; Inductance 2.65H; Q 2.61The version 2 is basically the same as the original but is a little bit brighter.AVn-48b MkI.v2  (bridge) 6.7 K-ohms; Resonance 3.6KHz; Inductance 3H; Q 2.75The version 2 is basically the same as the original but is a little bit brighter.