Personal sound amplification devices, or PSAPs, amplify sound waves for those who have normal hearing, or hearing thresholds of 20 dB or better in both ears. Unlike hearing aids, hearing amplifiers ...

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"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you have trouble getting your local TV channels, an HDTV antenna amplifier can help clean up your ...

There are few inventions that have been as crucial to the evolution of pop and rock music as the guitar amplifier. Indeed, many cite the 1951 Sun Records recording session of Jackie Brenston and his ...