Editing Loudspeaker (section)

====Piezoelectric speakers====
{{Main|Piezoelectric speaker}}
{{See also|Piezo tweeter}}
[[File:2007-07-24 Piezoelectric buzzer.jpg|thumb|A piezoelectric buzzer. The white ceramic piezoelectric material can be seen fixed to a metal diaphragm.]]

Piezoelectric speakers are frequently used as beepers in [[watch]]es and other electronic devices, and are sometimes used as tweeters in less-expensive speaker systems, such as computer speakers and portable radios. Piezoelectric speakers have several advantages over conventional loudspeakers: they are resistant to overloads that would normally destroy most high-frequency drivers, and they can be used without a crossover due to their electrical properties. There are also disadvantages: some amplifiers can oscillate when driving capacitive loads like most piezoelectrics, which results in distortion or damage to the amplifier. Additionally, their frequency response, in most cases, is inferior to that of other technologies. This is why they are generally used in single-frequency (beeper) or non-critical applications.

Piezoelectric speakers can have extended high-frequency output, and this is useful in some specialized circumstances; for instance, [[sonar]] applications in which piezoelectric variants are used as both output devices (generating underwater sound) and as input devices (acting as the sensing components of [[underwater microphone]]s). They have advantages in these applications, not the least of which is simple and solid-state construction that resists seawater better than a ribbon or cone-based device would.

In 2013, [[Kyocera]] introduced piezoelectric ultra-thin medium-size film speakers with only one millimeter of thickness and seven grams of weight for their 55" [[OLED]] televisions and they hope the speakers will also be used in PCs and tablets. Besides medium-size, there are also large and small sizes which can all produce relatively the same quality of sound and volume within 180 degrees. The highly responsive speaker material provides better clarity than traditional TV speakers.<ref>{{cite web |last=Fingas |first=Jon |url=https://www.engadget.com/2013/08/29/kyocera-piezoelectric-film-speaker/#continued |title=Kyocera Piezoelectric Film Speaker Delivers 180-Degree Sound to Thin TVs and Tablets (Update: Live Photos) |website=Engadget |date=August 29, 2013 |access-date=April 30, 2024 }}</ref>