The Grey Ghost DMC h.p.'s cut the speaker on the CTX and "bring in" the same tone in each earcup (unlike when used on the Nautilus, the DMC's bring in a different tone in each ear cup).-----My question(s) is to any one that has tested/used these----(1) Does the DMC's have a loud enough tone when used on the CTX?-----(2) Does the DMC's "work" on other detectors (mainly the Etrac & GB Pro)?-----If you only know the answer to half these questions, that's good enough!---I'll take what I can get! ------------Del