im using 18 and 90. it shouldnt hurt your phone. but anything is possible.
since how long are u using it and have u heard anyone having speaker issues due to this?i m worried bcoz i dont have warranty on my n5 its of another country .i was facing minor distortion on 93
ive been using it since the first 5 minutes he released the app. but this was being used before, not in app form, but by modding it yourself. and the higher you go, the more distortion you will hear.