I have recently purchased a new Gentex 56/p still equipped for military use avionics wise. My question is this...I know the mic must be replaced for use GA but must the earphones also be replaced? I have known David Clarkes to be converted by only switching the mic but have heard its different for these helmets. Part 2, if i was to but the low- high impedance adapter instead of a new mic, would that take care of both the mic and the earphones? Knowledgeable replies are very much appreciated, guesses not needed. Thank you so much for any help with this!