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Center speakers handle the core of audible sound spectrum, the region that contains most of fundamental sound emitted from musical instruments and human voice.
Door speakers are representative speakers of those among equipped in automobiles, and cover most of audible sound spectrum (70~10kHz).
Midrange speakers cover sound spectrum between low and high frequency, from 200 Hz to 3 kHz.
Tweeter speakers cover the highest frequencies, from 3 kHz to 20 kHz.
Subwoofer speakers cover the lowest frequencies, from 20 Hz to 200 Hz.
Automobiles that operate with electric motors – electric vehicle (EV), hybrid EV (HEV), plug-in hybrid EV (PHEV), etc – do not generate large sound when driving, which exposes pedestrians at risk of accidents. VESS, or AVAS generates artificial engine sound to alert pedestrians of incoming electric vehicles and prevent accidents.
Ecall speakers generate warning sound and allow a voice call in an emergency situation.
Micro speakers are mainly used for communication devices such as telephones, CDMA, GSM and other electronic devices such as electronic toll collection device, laptops, gaming devices. Micro speakers are becoming smaller and creating larger sound, with additional functions attached.