What is "tweeters"

Usage examples of "tweeters".

She was perfectly willing to admire the sound quality, she was even willing to listen to Peter enthuse about woofers and tweeters and internal stabilization somethings, but she was not willing to listen to opera all the way into London, especially not with the two wer singing along.

He was sitting on the floor, surrounded by loudspeakers, records, amplifier components, extra tweeters, a turn-table, a soldering iron and hi-fi magazines.