It‘s always a pita to remove the water behind the speaker grille after a hunt + the speaker attracts magnetic material / sand. Simple solution: Cover the grille with a sticker. I use a clear sticker, which you can buy on a roll and cut it to your desired size. Did that to my Nox years ago, and it still holds up fine. I don‘t use the speaker anyway.. even with the sticker on, it‘s loud enough for tests etc.