Recently, Arioso Systems, an audio start-up company in Germany, disclosed a prototype of a new type of micro-electromechanical system (MEMS) speaker developed by itself. This MEMS speaker does not require the use of membranes or magnets, 

and has huge advantages in size.

According to the company's introduction, MEMS speakers are realized by relying on a nano-electrostatic driver technology that enables MEMS speakers to be comparable in size to chips, making headphones smaller.

At present, the sound-emitting unit of the earphone is mainly composed of components such as films and magnets. 

These components need to occupy a certain volume and require a large amount of power to promote. 

In contrast, the size of the MEMS speaker is about 10 to 20mm2, and the thickness is even more. 

Only 1 to 2mm, and the required power is not much.

It is reported that the sound of the MEMS speaker is realized by several 20nm-long flexible columns inside.

When the sound source applies voltage to the flexible columns, 

the flexible columns will bend away from each other and generate vibrations,

which will push the air out of the small grooves of the sound-generating unit, thereby producing sound.

In terms of sound quality that users are concerned about, according to the description of Arioso Systems, 

although the volume of the MEMS speaker is not large, it can still reach 120dB and a relatively excellent sound quality.