Well, sometimes on my matches (unofficial ones, I referee street football and I have a very good reputation as the "Book", just like Clive Thomas!) when I blow my whistle for a valid reason to stop the play, the players do not respond. I have to blow my whistle 5 times for a throw-in as example. When I approached a player, he said that I do not blow the whistle hard enough. For me, it seems like I blow it hard.. Do I need to blow it very hard like in a real football match? The kind of blowing that literally kills your ears? I need some advice on how to whistle hard enough, or even how to attract their attention.