How do you make a parabolic speaker, or other non-headphone based personal listening aparatus
I have learned to hit the snooze button in my sleep, so I am making a math alarm clock. It makes you do math to turn it off. But since this alarm clock could be on for 30+ seconds, I'm looking for a way to make it not annoy my roommate. I was thinking of a parabolic speaker, but they cost $400+. Anyone know how to make one, or another solution to this problem?