TS vs.TRS

[Hussein El sherbini]

i always thought you could connect TS to TRS fine but when it came to TRS into TS the issue would be that the terminal that should touch the sleeve which is ground in TS could end up only touching the ring which is cold or (-ve) and not make contact with the sleeve at all causing no ground. I’m currently building a wall box for the studio and i’m wondering if i will have to get both TRS and TS plugs. what’s your say?