Other speakers works

< A > Magnetic speaker : also known as " Reed speaker " , the structure shown in Figure 4 , between the poles of the permanent magnets having a movable core electromagnet , the coil of the Multimedia Speaker electromagnet when there is no current , the movable core phase by the two poles of the permanent magnet attract attractive level , in the center remains stationary ; when current flows through the coil , the movable iron core is magnetized to become a shaped magnet . As the current changes direction , the polarity of a corresponding change in the bar magnet , the movable iron core for rotary movement about a fulcrum , the movable iron core by the vibrations transmitted to the cantilever diaphragm ( cone ) to promote hot air vibrations .
< Two > electrostatic speaker : it is applied to the capacitor electrode plate using the electrostatic speaker working , to see the structure of a capacitor formed by facing the positive and negative form , also known capacitive speaker. As shown, there are thick and hard Wireless Speaker material as the two fixed plates , the plates can have the sound through the middle of the plate with a thin, lightweight material used for the diaphragm (e.g., aluminum ) . Fixed around the diaphragm , which is very taut to keep a considerable distance and fixed , even in boosted film tends not to collide with a stationary pole .
Existing between the electrodes a DC voltage ( called bias ) . If the audio output by the amplifier plus a voltage between the two electrodes , the output voltage relative to the original overlapping and pulsating alternating voltage , the ripple voltage generated in the gap between the poles of attraction strength change, and therefore the diaphragm vibration sound.
Advantages of the entire diaphragm electrostatic loudspeaker phase vibration , light diaphragm , distortion, can be extremely crisp sound reproduction with good resolution , detail clear , lifelike sound . Its disadvantage is low efficiency, high-voltage DC power needs , easy cleaning , the diaphragm will increase the distortion increase , not suitable to rock , heavy metal music , the price is relatively expensive.