Buyer Spotlight: Electromagnetic and Electrostatic Speakers In this Buyer Spotlight we will use the physics behind electromagnetic and electrostatic speakers to compare, contrast and justify which is the best option for the audio section of an integrated home theater system.( points main, titles)What are the underlying physical principles:Electromagnetic speakers convert the electrical signal into sound by vibrating the voice coils. The original sound is recorded by a microphone and is amplified until it becomes large enough to be applied to the voice coils. Moving coils, electromagnets, are located in the magnetic field of a permanent magnet. Since the voice coils are an electromagnet, they are capable of changing the polar orientation. When the amplifier applies the signal, the voice coils change polarity and continuously react with the permanent magnet. The voice coils vibrate at the same frequency, harmonic content and magnitude as the corresponding sounds. The voice coils drive the speaker cone, moving the air and creating differences in atmospheric pressure and, therefore, sound. Figure 2. Electromagnets...