11. The last character denotes the magnet / voice coil size, and directly influences the power rating. 12. In 2002, Meyer Sound produced the SB-2, a horn with a throat and a voice coil . 13. Planar magnetic speakers consist of a flexible membrane with a voice coil printed or mounted on it. 14. Four years later, in 1915, they built a dynamic loudspeaker with a voice coil , a corrugated G. 15. The purpose of the cone / surround assembly is to accurately reproduce the voice coil signal waveform. 16. The arm is moved using a voice coil actuator or in some older designs a stepper motor. 17. In loudspeakers, thermal capacities of the voice coils and magnet structures largely determine continuous power handling ratings. 18. This is due to Morel's own, super-secret audio technology, cryptically called EVC ( external voice coil ). 19. In the earliest loudspeakers, voice coils were wound onto paper bobbins, which was appropriate for modest power levels. 20. More technically, the phone's speaker has to have a voice coil that generates a relatively strong electromagnetic field.
