The radio sounds pretty narrow so it masks the difference in mics but they still all sound different,
palomar sounds average, not much trebble or bass,
ranger sra has more bass & similar trebble/mids
rk56 has more mids/trebble, more articulate & readable in noisy conditions
cr577 sounds ceramic nothing offensive or outstanding, better than turner
turner m+2 sounds flat and dull & its set lower than the others
back in the day they always sounded too bright / tinny
probably suffering from old age or inactivity