Schemes and technology of everyday devices.

Once upon a time, at the dawn of its existence, portable dynamic emitters were found only in handsets. These speakers were adopted by radio amateurs and for use in radio receivers but were intended, first of all, only for the transmission of human speech, and therefore did not differ in the latitude of the radiated range of the sound spectrum.

In addition, the first headphones had large sizes and were characterized by a high resistance rate, which was important when used with lamp technology. Since then, nothing has changed dramatically, but today's headphones sound much better and have become much more compact. Improved sound quality is triggered by the advent of the Hi-Fi standard, which describes devices that produce a sound of high purity. What are modern headphones? Check it here - https://www.bestadvisers.co.uk/best-headphones