Thanks, Nick. That makes sense.
I just found myself wondering if people all over were on their way to burning out their tweeters by bumping them up 3dB.
I then had my daughter hold one end of the screen in front of the speaker, and then lift it out of the way.
Honestly, I may have been noticing it more since I could see the test (screen moving in front of and away from the speaker).
You know, if I ever DO have a room suitable for a projector, I'm going to ask you and your daughter to repeat this test, but ask you to close your eyes!