headphones

HISTORY:
Headphones originated from the earpiece. Sensitive headphones were the only way to listen to audio signals before amplifiers were developed. Very sensitive headphones such as those manufactured by Brandes around 1919 were commonly used for early radio work. These early headphones used moving iron drivers, either single ended or balanced armature. The requirement for high sensitivity meant no damping was used, thus the sound quality was crude. [|Best Cheap Headphones] also shows that they also had very poor comfort compared to modern types, usually having no padding and too often having excessive clamping force to the head. Their impedance varied; headphones used in telegraph and telephone work had an impedance of 75 ohms. Those used with early wireless radio had to be more sensitive and were made with more turns of finer wire; impedance of 1,000 to 2,000 ohms was common, which suited both crystal sets and triode receivers. In-ear headphones

# Earbuds:
Earbuds or earphones are headphones of a much smaller size that are placed directly outside of the ear canal, but without fully enveloping it. = = Brandes radio headphones, circa 1920.

MY OPINION:
The headphones, are one of the most intelligent inventes in my opnion, because, imagine you are in a public place and somebody want to listen a music that you don't like but you have to listen...