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2. Crystal radio - Wikipedia

   en.wikipedia.org/wiki/Crystal_radio

   Standard headphones used in telephone work had a low impedance, often 75 Ω, and required more current than a crystal radio could supply. Therefore, the type used with crystal set radios (and other sensitive equipment) was wound with more turns of finer wire giving it a high impedance of 2000–8000 Ω.

3. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   Some very sensitive headphones, such as those manufactured by Brandes around 1919, were commonly used for early radio work. In early powered radios, the headphone was part of the vacuum tube's plate circuit and carried dangerous voltages. It was normally connected directly to the positive high voltage battery terminal, and the other battery ...

4. Crystal earpiece - Wikipedia

   en.wikipedia.org/wiki/Crystal_earpiece

   Crystal earpieces are usually monaural devices with very low sound fidelity, but high sensitivity and impedance. Their peak use was probably with 1960s era transistor radios and hearing aids. They are not used with modern portable media players due to unacceptable sound quality. The main causes of poor performance with these earpieces are low ...

5. FM broadcasting - Wikipedia

   en.wikipedia.org/wiki/FM_broadcasting

   It belongs to FM radio station KWNR, in Henderson, Nevada, and broadcasts at 95.5 MHz. FM broadcasting is a method of radio broadcasting that uses frequency modulation ( FM) of the radio broadcast carrier wave. Invented in 1933 by American engineer Edwin Armstrong, wide-band FM is used worldwide to transmit high-fidelity sound over broadcast radio.

6. Beats Electronics - Wikipedia

   en.wikipedia.org/wiki/Beats_Electronics

   Beats Electronics LLC. Beats Electronics LLC (also known as Beats by Dr. Dre, or simply Beats by Dre) is an American consumer audio products manufacturer headquartered in Culver City, California. [1] [2] The company was founded in 2006 by music producer Dr. Dre and record company executive Jimmy Iovine. Since 2014, it has been an Apple subsidiary.

7. Officially, the 8 Best Headphones Money Can Buy - AOL

   www.aol.com/officially-8-best-headphones-money...

   WH-1000XM4. Just below those Bowers & Wilkins in price is Sony's WH-1000XM4. (Bad product naming here.) The main seller for these is the noise-cancelling—which is the best out there.Of all the ...