#2
A small unit designed to produce higher frequencies, in conjunction with a crossover and speakers.

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Yamaha TRB1006
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#3
http://en.wikipedia.org/wiki/Tweeter

I'm still amazed that people haven't figured out how to use google.
"It often happens that I wake up at night and begin to think about a serious problem and decide I must tell the pope about it. Then I wake up completely and remember that I am the pope."


---Pope John XXIII