According to this answer citing RaM"A (124:11), you can answer Amen to any Berachah even if you don't hear it, so long as you know which one is being said. Does this apply only to Tefillah BeTzibur ...
Shmuel is playing music in car. He decides to crank up the volume and opens his windows so that rest of society can hear the music. Is this forbidden, halachically? Even if it is permitted, is there ...