Hi!
I’m making some own metro station announces, and i want that my own sound will have the same (call sound) of “The next station is” if you know what i mean.
Please, help if it is possible to do 
As a start, use the Equalization effect to cut off all the bass and much of the treble - something similar to the “walkie-Talkie” preset will be a good start. Then add some Echo, and some reverberation (Reverb). You will need to experiment to get the exact sound that you want.